CN110912252B - Switching power supply circuit and airborne equipment - Google Patents

Switching power supply circuit and airborne equipment Download PDF

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Publication number
CN110912252B
CN110912252B CN201911104883.XA CN201911104883A CN110912252B CN 110912252 B CN110912252 B CN 110912252B CN 201911104883 A CN201911104883 A CN 201911104883A CN 110912252 B CN110912252 B CN 110912252B
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voltage
circuit
direct current
output
power supply
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CN110912252A (en
Inventor
白燕羽
沈领
张艳玲
陈月安
欧阳鹏
谷新宇
薛晓波
叶子嘉
杨旭
任广华
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AECC South Industry Co Ltd
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AECC South Industry Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a switching power supply circuit and airborne equipment, when an alternating current input power supply is in an abnormal working state, a standby power supply provides input direct current voltage for the switching power supply circuit, so that the switching power supply circuit converts the input direct current voltage into a plurality of direct current output voltages for the switching power supply circuit and the airborne equipment to use, and an under-voltage detection circuit is further arranged in the switching power supply circuit to monitor the safety of the switching power supply circuit in real time, so that the switching power supply circuit is wide in application range, the airborne equipment using the switching power supply circuit is not limited by abnormal or abnormal use of the alternating current power supply, and the safety and the reliability are high.

Description

Switching power supply circuit and airborne equipment
Technical Field
The invention relates to the technical field of power supply circuits of airborne equipment, in particular to a switching power supply circuit and airborne equipment.
Background
In recent years, a low-power-consumption and high-efficiency DC/DC switching power supply is gradually used by an onboard equipment power supply, the onboard power supply has the characteristics of high reliability, stable operation, small ripple, conduction interference resistance and the like, most DC/DC power supply conversion modules of the onboard equipment are in three stages, namely +28V to +/-15V and 5V, or +28V to +/-12V and 10V, and the like, and currently, along with the gradual step-in nanoscale process of CMOS semiconductor processing, the number of gates of integrated circuits is more and more, the power consumption is lower and more, the multistage development trend of the power supply is obvious, and the common low-voltage integrated circuit power supply voltages are 3.3V, 1.8V, 1.5V, 1.2V, 1.0V, 0.8V and the like.
In addition, in the conventional switching power supply circuit of the on-board device, only the three-phase alternating-current power supply of the PMA engine is used for increasing the input, so that when the three-phase alternating-current power supply of the PMA engine is in an abnormal state, the switching power supply circuit of the on-board device cannot continue to work normally, and the use of the on-board device is limited.
Disclosure of Invention
The invention provides a switching power supply circuit which meets the power supply requirement of each module of airborne equipment and simultaneously avoids the problem that the airborne equipment cannot be used continuously due to the failure of a three-phase alternating current power supply of a PMA engine.
A switching power supply circuit comprising:
an input stage circuit for providing a DC input voltage,
a voltage conversion circuit for converting the DC input voltage into a DC output voltage and outputting the DC output voltage,
a control circuit that controls the voltage conversion circuit to convert the DC input voltage to a desired DC output voltage,
wherein the input stage circuit comprises an AC input circuit and a DC input circuit,
the alternating current input circuit is used for converting alternating current voltage provided by an alternating current power supply into the direct current input voltage and inputting the direct current input voltage into the voltage conversion circuit,
and when the alternating current input circuit cannot be in a normal working state, the direct current input circuit inputs standby direct current power supply voltage serving as the direct current input voltage to the voltage conversion circuit.
Further, the voltage conversion circuit comprises a first stage voltage conversion circuit and a second stage voltage conversion circuit,
the first-stage voltage conversion circuit comprises at least one DC-AC conversion circuit for converting the DC input voltage into a first-stage AC output voltage and outputting the first-stage AC output voltage, and at least one DC-DC conversion circuit for converting the DC input voltage into a first-stage DC output voltage and outputting the first-stage DC output voltage,
the second-stage voltage conversion circuit comprises at least one path of alternating current-direct current conversion circuit and is used for converting the first-stage alternating current output voltage into a second-stage direct current output voltage to be output.
Further, the alternating current input circuit comprises a three-phase half-wave rectification circuit, an alternating current input undervoltage detection circuit and an input PWM control circuit,
the alternating current PWM control circuit is used for controlling the three-phase half-wave rectification circuit to convert the three-phase alternating current voltage output by the PMA three-phase alternating current power supply into the stable direct current input voltage,
the alternating current input undervoltage detection circuit is used for detecting whether the three-phase alternating current voltage is in an undervoltage state or not,
the direct current input circuit comprises a common mode filter circuit, a safety circuit and a differential mode inductance filter output circuit which are connected in sequence, and also comprises a direct current input undervoltage detection circuit,
the voltage of the standby power supply is input to the direct current input circuit from the common mode filter circuit end and is output by the differential mode inductance filter output circuit, and the direct current input under-voltage detection circuit is used for detecting whether the voltage of the standby power supply is in an under-voltage state or not.
Further, in the initial stage of the power-on of the switching power supply circuit, the dc input voltage output by the dc input circuit provides a power supply voltage to the switching power supply conversion circuit through a start circuit inside the switching power supply circuit to start the switching power supply circuit, until the ac power supply input circuit is detected to be in a normal operating state, the dc voltage input circuit stops operating, and the ac power supply input circuit outputs the dc input voltage,
after the switching power supply circuit is started, the direct current input voltage is converted into the power supply voltage of the switching power supply circuit through the voltage conversion circuit.
Further, the alternating current input undervoltage detection circuit detects whether the three-phase alternating current voltage is in an undervoltage state by detecting the size of the first phase voltage output by the three-phase alternating current power supply.
Furthermore, the first stage voltage conversion circuit comprises a DC-AC conversion circuit, a first DC-DC conversion circuit and a second DC-DC conversion circuit which are parallel,
the second-stage voltage conversion circuit comprises a first path of parallel alternating current-direct current conversion circuit, a second path of parallel alternating current-direct current conversion circuit and a third path of parallel alternating current-direct current conversion circuit,
wherein, the first path of DC-DC conversion circuit is used for converting the DC input voltage into a first DC output voltage for output and providing independent power supply for the protection circuit,
the second DC-DC conversion circuit is used for converting the DC input voltage into a second DC output voltage for output and providing a power supply for the stepping motor,
the first path of alternating current-direct current conversion circuit is used for converting the first stage alternating current output voltage into a third direct current output voltage to be output,
the second AC-DC conversion circuit is used for converting the first-stage AC output voltage into a fourth DC output voltage to be output,
and the third AC-DC conversion circuit is used for converting the first-stage AC output voltage into a fifth DC output voltage and outputting the fifth DC output voltage.
Further, the first DC output voltage and the third DC output voltage are voltages isolated from each other but having the same magnitude,
the control circuit receives the third direct current output voltage and controls the switching state of a power switching tube in the first-stage direct current-alternating current conversion circuit according to the third direct current output voltage, so that the direct current output voltage output by each path of alternating current-direct current conversion circuit is controlled to be maintained at an expected value.
Further, the voltage conversion circuit further includes:
a first voltage regulator circuit for converting the fourth DC output voltage into a sixth DC output voltage,
a second voltage stabilizing circuit for converting the fifth DC output voltage into a seventh DC output voltage,
a first voltage adjusting circuit for converting the third DC output voltage into an eighth DC output voltage and a ninth DC output voltage,
a second voltage adjusting circuit for converting the ninth DC output voltage into a tenth DC output voltage,
and the third voltage regulating circuit is used for converting the sixth direct current output voltage into an eleventh direct current output voltage and outputting the eleventh direct current output voltage.
Further, the switching power supply circuit further includes:
a first feedback detection circuit for detecting the third dc output voltage, and if the third dc output voltage is higher than the first reference voltage, instructing the control circuit to control the output voltage of the dc-ac conversion circuit to decrease so as to pull down the third dc output voltage,
and the second feedback detection circuit is used for detecting the sixth direct-current output voltage, and if the sixth direct-current output voltage is lower than a second reference voltage, the second feedback detection circuit indicates that the alternating-current input circuit does not perform chopping control on an alternating-current power supply provided by the alternating-current power supply so as to enable the direct-current input voltage to rise, and thus the rising of the sixth direct-current output voltage is controlled.
An onboard apparatus comprising a switching power supply circuit as described above.
It is from top to bottom seen, when being in unusual operating condition at AC input power supply through stand-by power supply, provide input DC voltage for switching power supply circuit to supply switching power supply circuit to convert input DC voltage into a plurality of direct current output voltage confession switching power supply circuit itself with airborne equipment uses, just still be provided with under-voltage detection circuit among the switching power supply circuit, with real time monitoring switching power supply circuit's safety, consequently switching power supply circuit range of application is extensive, uses its airborne equipment's the restriction that can't normally use often not by AC power supply anomaly, and fail safe nature is high.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a switching power supply circuit according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a preferred implementation of a dc input circuit in a switching power supply circuit according to the invention;
fig. 3 is a circuit diagram of a preferred implementation of an ac input circuit in a switching power supply circuit according to the invention;
fig. 4 is a schematic diagram of a first circuit portion of a switching power supply circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a second circuit portion of a switching power supply circuit according to an embodiment of the invention;
fig. 6 is a circuit diagram of an implementation of a first dc-dc conversion circuit in a switching power supply circuit according to an embodiment of the present invention;
fig. 7 is a circuit diagram of an implementation of a second dc-dc converting circuit in the switching power supply circuit according to the embodiment of the invention;
fig. 8 is a circuit diagram of an embodiment of a first voltage adjustment circuit in a switching power supply circuit according to the invention;
fig. 9 is a circuit diagram of an implementation of the third voltage adjustment circuit in the switching power supply circuit according to the embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a schematic structural diagram of a switching power supply circuit according to a preferred embodiment of the present invention is shown, where the switching power supply mainly includes an input stage circuit, a voltage conversion circuit, and a control circuit. The input stage circuit is used for providing direct current input voltage for the voltage conversion circuit, the voltage conversion circuit outputs expected direct current output voltage under the control of the control circuit, and the control circuit controls the conversion of the voltage conversion circuit according to the output voltage output by the voltage conversion circuit.
As shown in fig. 1, the input stage circuit further includes an ac input circuit and a dc input circuit, wherein the ac input circuit is configured to receive an ac voltage provided by an external ac power source (such as a PMA three-phase ac power source) and convert the ac voltage into the dc output voltage to output to the voltage conversion circuit, and the dc input circuit is configured as a standby input circuit and is configured to receive a dc voltage provided by a standby power source and convert the dc voltage into the dc output voltage to output to the voltage conversion circuit when the ac input circuit cannot be in a normal operating state, such as the ac power source is damaged or some element in the ac input circuit is damaged.
In an initial stage of power-on of the switching power supply circuit, the direct-current input voltage output by the direct-current input circuit provides power supply voltage for the switching power supply circuit through a starting circuit in the switching power supply circuit so as to start the switching power supply circuit, the direct-current voltage input circuit stops working until the alternating-current power supply input circuit is detected to be in a normal working state, and the direct-current input voltage is output by the alternating-current input circuit, wherein after the switching power supply circuit is started, the direct-current input voltage is converted into the power supply voltage of the switching power supply circuit through the voltage conversion circuit.
Obviously, the switching power supply circuit provided by the invention is provided with the standby power supply input circuit, and the standby power supply can continuously provide the input voltage for the voltage conversion circuit when the alternating current power supply cannot be used, so that the onboard equipment applying the switching power supply can be normally powered and used.
The voltage conversion circuit of the switching power supply circuit provided by the invention can be composed of multiple stages of voltage conversion, such as each first-stage voltage conversion circuit for converting the direct-current input voltage into each first-stage output voltage and outputting, and each second-stage voltage conversion circuit for converting part or all of the first-stage output voltage into each second-stage output voltage and outputting. The first-stage output voltage comprises a first-stage alternating current output voltage and a first-stage direct current output voltage, and the first-stage output voltage is a voltage obtained by directly converting the direct current input voltage through a first-stage conversion circuit. The second-stage output voltage is a direct-current voltage which is converted from the direct-current input voltage through a two-stage conversion circuit.
Specifically, the first-stage voltage conversion circuit includes at least one dc-ac conversion circuit for converting the dc input voltage into a first-stage ac output voltage and outputting the first-stage ac output voltage, and includes at least one dc-dc conversion circuit for converting the dc input voltage into a first-stage dc output voltage and outputting the first-stage dc output voltage, and the second-stage voltage conversion circuit includes at least one ac-dc conversion circuit for converting the first-stage ac output voltage into a second-stage dc output voltage and outputting the second-stage dc output voltage.
Referring to fig. 1, in this embodiment, the first-stage voltage conversion circuit includes a dc-ac conversion circuit and a first dc-dc conversion circuit and a second dc-dc conversion circuit that are parallel to each other, and the second-stage voltage conversion circuit includes a first ac-dc conversion circuit, a second ac-dc conversion circuit, and a third ac-dc conversion circuit that are parallel to each other.
The first path of direct current-direct current conversion circuit is used for converting the direct current input voltage into a first direct current output voltage output Uo1, and is used for providing independent power supply for a protection circuit in the switching power supply circuit or a protection circuit in a system applying the switching power supply circuit, and the output end of the first direct current output voltage Uo1 can be isolated from other direct current output ends output by the switching power supply circuit, so that the normal work of the protection circuit is ensured, and the safety performance of the switching power supply circuit or the applied system is improved. The second path of direct current-direct current conversion circuit is used for converting the direct current input voltage into a second direct current output voltage Uo2 for output, and is used for supplying power to the stepping motor. The stepping motor is a component of airborne equipment applying the switching power supply circuit, belongs to the load of the switching power supply circuit, and is driven by the switching power supply circuit to work. The first path of alternating current-direct current conversion circuit is used for converting the first stage alternating current output voltage into a third direct current output voltage UO3 for output, and the third direct current output voltage UO3 is the same as the first direct current output voltage UO1 in size. The second path of alternating current-direct current conversion circuit is used for converting the first stage alternating current output voltage into a fourth direct current output voltage Uo4 for output. The third AC-DC conversion circuit is used for converting the first-stage AC output voltage into a fifth DC output voltage Uo5 for output.
In order to further realize the multiple outputs of the switching power supply circuit, the switching power supply may further include a third-stage voltage converting circuit for converting part or all of the second-stage output voltage into respective third-stage output voltage outputs, and may further include a fourth-stage voltage converting circuit for converting part or all of the third-stage output voltage into respective fourth-stage output voltage outputs. For example, in fig. 1, the third-stage voltage converting circuit includes a first voltage adjusting circuit, a first voltage stabilizing circuit, and a second voltage stabilizing circuit, and the fourth-stage voltage converting circuit includes a second voltage adjusting circuit and a third voltage adjusting circuit. Specifically, the first voltage stabilizing circuit is configured to convert the fourth dc output voltage Uo4 into sixth dc output voltage Uo6 for output. The second voltage stabilizing circuit is used for converting the fifth direct current output voltage Uo5 into seventh direct current output voltage Uo7 for output. The first voltage adjusting circuit is used for converting the third direct current output voltage Uo3 into an eighth direct current output voltage Uo8 and a ninth direct current output voltage Uo9 for output. The second voltage adjusting circuit converts the ninth dc output voltage Uo9 into a tenth dc output voltage Uo10 for output. The third voltage adjusting circuit is used for converting the sixth direct current output voltage UO6 into an eleventh direct current output voltage UO11 for output. In this embodiment, the dc input voltage is generally +28V, and the magnitudes of the first to eleventh dc output voltages obtained by the voltage converting circuits are respectively: the output voltages of +5V, +24V, +5V, +22V, -22V, +15V, -15V, +1.8V, +3.3V, +1.2V, and 10V may satisfy various power supply requirements of a system to which the switching power supply circuit is applied, and may also provide power supply voltages for the switching power supply circuit, for example, a voltage of +5V (third dc output voltage Uo3) and a voltage of +15V (sixth dc output voltage Uo6) as power supply voltages for internal modules of the switching power supply circuit.
The control circuit comprises a conversion PWM control circuit, and the conversion PWM control circuit receives the third direct current output voltage Uo3 and controls the switching state of a power switch tube (such as a switch tube V23 in FIG. 4) in the direct current-alternating current conversion circuit according to the third direct current output voltage Uo3, so as to control the direct current output voltage output by each path of the alternating current-direct current conversion circuit to be maintained at a desired value.
Fig. 2 is a circuit diagram of a preferred implementation of the dc input circuit shown in fig. 1. The dc input circuit is connected to a dc backup power supply to receive a voltage provided by the dc backup power supply, which is typically set to + 28V. The direct current input circuit mainly comprises a common mode filter circuit Z1, a safety circuit FU1 and a differential mode inductance filter output circuit L1 which are connected in sequence, and further comprises a direct current input under-voltage detection circuit. The common mode filter circuit Z1 is connected with the DC standby power supply, the DC voltage output by the DC standby power supply passes through the common mode filter circuit Z1 and the safety circuit FU1 in sequence and then is output by the differential mode inductance L1 filter output circuit, preferably, the DC input circuit further comprises a transient voltage suppression circuit positioned between the standby input power supply and the common mode filter circuit Z1 and a de-noising circuit VC1 positioned behind the differential mode inductance filter output circuit L1, and the transient voltage suppression circuit mainly comprises a voltage stabilizing tube V3 and a voltage stabilizing tube V4. The direct current input under-voltage detection circuit mainly comprises a hysteresis comparison circuit formed by a comparator N1B and peripheral circuits thereof, and is mainly used for detecting the output voltage (+28V voltage) of the standby power supply so as to judge whether the standby power supply is in an under-voltage state or not. As shown in fig. 2, the dc input under-voltage detection circuit is connected to the output terminal of the safety circuit FU1, so as to convert the voltage at this point into a voltage Up through the resistor R7, the resistor R8, the resistor R5, and the capacitor C2, and then compare the voltage Up with the reference voltage Un, so as to implement real-time monitoring of the +28V voltage. Under normal conditions, the voltage of the direct current input voltage +28V provided by the standby power supply is in a non-undervoltage state, the Uo end outputs high level, and the resistor R6 is a pull-up resistor. The operational equation of the non-inverting input end of the comparator N1B is as follows:
Figure BDA0002270985610000061
when U is turnedPWhen the voltage is 2.5V, Uin is the dc input voltage, and calculated as Uin 15.1V. Namely Uin is powered down from +28V to less than 15.1V, the output of N1B is inverted to low level, which indicates that the voltage provided by the DC standby power supply is in an undervoltage state.
Before Uin rises from the undervoltage state to the normal state, Uo outputs low level 0V, and the operation equation of the non-inverting input end of the comparator N1B is as follows:
Figure BDA0002270985610000062
when UP is 2.5V, Uin is calculated to be 18.23V. That is, when Uin rises back to more than 18.23V from the under-voltage state, the output of the comparator N1B flips to high level, which indicates that the dc input voltage of the standby power supply input is not in the under-voltage state at this time. The direct current undervoltage detection signal output by the direct current input undervoltage detection circuit can be input to a CPU module of the switching power supply circuit through the switching value acquisition circuit so as to form state monitoring of the input end of the direct current +28V direct current voltage source.
Fig. 3 is a circuit diagram of a preferred implementation manner of the ac input circuit shown in fig. 1, where the ac input circuit includes a three-phase half-wave rectification circuit, an ac under-voltage detection circuit, and an input PWM control circuit. The input PWM control circuit is used for controlling the three-phase half-wave rectification circuit to convert three-phase alternating current voltage output by the PMA three-phase alternating current power supply into stable direct current input voltage. The alternating current input undervoltage detection circuit is used for detecting whether the three-phase alternating current voltage is in an undervoltage state.
Specifically, the alternating current input circuit is connected with an external PMA three-phase alternating current power supply to receive PMA three-phase alternating current voltage. And the PMA three-phase alternating-current voltages PMA-A, PMA-B and PMA-C output a direct-current voltage Uin as a direct-current input voltage of the voltage conversion circuit after passing through the three-phase half-wave rectification circuit. The input PWM control circuit mainly comprises a pulse width modulator N5 and a peripheral circuit thereof, the alternating current input undervoltage detection circuit mainly comprises a hysteresis comparison circuit consisting of a comparator N1A and a peripheral circuit thereof, and is mainly used for monitoring whether the three-phase alternating current input voltage is in an undervoltage state or not in real time, and the specific components and the connection relation of each circuit are shown in a reference figure 3.
The direct current input voltage Uin is sampled and divided by resistors R35 and R36 and is input as the negative terminal of an error amplifier in the pulse width modulator N5, and the calculation formula of the voltage of pin 1 of the pulse width modulator N5 is as follows:
Figure BDA0002270985610000071
the positive input of the error amplifier inside the pulse width modulator N5 is connected to the internal reference voltage + 5V. The output of the input PWM control circuit is output by a complementary push-pull circuit formed by transistors V28 and V29. When the direct current voltage Uin increases (i.e. exceeds the critical value of 34.15V), the voltage of pin 1 of the input pulse width modulator N5 is greater than 5V, the duty ratio of the input PWM control signal inputted to the output of the PWM control circuit becomes large, and the frequency of the input PWM control signal is determined by R37 and C29. The input PWM control signals respectively control the conduction time of the field effect transistors V14, V15 and V16, and further control the input of PMA three-phase alternating voltage PMA-A, PMA-B and PMA-C, so that the direct current input voltage Uin is maintained to be a desired voltage. Specifically, when the direct-current voltage Uin needs to be reduced (but not reduced to 34.15V), the output duty ratio of the input PWM control signal is reduced, and then the input of the PMA three-phase alternating-current voltage is controlled to be chopped, so that the direct-current voltage Uin is controlled and stably output. And when the direct current voltage Uin is less than 34.15V and the voltage of the pin 1 of the N5 input to the pulse width modulator is less than 5V, the duty ratio of the input PWM control signal is not changed, and at the moment, the input of the PMA alternating current three-phase voltage is not controlled.
For example, in this embodiment, the ac input under-voltage detection circuit receives the PMA-a ac voltage, detects whether the three-phase ac voltage provided by the three-phase ac power supply is in an under-voltage state by detecting whether the voltage of the phase is in the under-voltage state, and if the three-phase ac voltage is not in the under-voltage state, the pin 2 of the comparator N1A outputs a high level, the resistor R4 is a pull-up resistor, and the diode V2 is turned off. The non-inverting input voltage of comparator N1A is:
Figure BDA0002270985610000072
when U is turnedPWhen the voltage drops to less than 2.5V, namely Uin is lower than 30.03V, the 2-pin output of N1A is inverted to low level.
When Uin rises from the undervoltage state, pin 2 of N1A outputs low level, diode V2 is turned on, and the operational equation of the non-inverting input terminal of comparator N1A is as follows:
Figure BDA0002270985610000081
when U is turnedPWhen 2.5V, Uin was calculated to be 32.05V. That is, Uin rises back to more than 32.05V from the under-voltage state, the output of pin 2 of the comparator N1A is flipped to high level. The alternating current undervoltage detection signal output by the alternating current input undervoltage detection circuit can be input to a CPU module of the switching power supply circuit through the switching value acquisition circuit so as to form state monitoring of the input end of the three-phase alternating current power supply.
Fig. 4 is a schematic diagram of a first circuit structure of a switching power supply circuit according to an embodiment of the invention. An input direct current voltage +28V passes through a starting circuit composed of a resistor R9, a voltage regulator tube V7, a diode V6 and a diode V8, at the initial stage of starting of the switching power supply circuit, a starting voltage of about 12.6V is output according to the direct current input voltage provided by the standby power supply, a power supply voltage is provided for a controller N3 in a control circuit of the switching power supply to start a controller N3, and after the controller N3 is started, a transformer T1 converts the direct current input voltage into three alternating current voltages which are respectively output by pins 7, 5 and 3 of the transformer T1. Referring to fig. 5, which is a schematic diagram of a second partial circuit structure in the switching power supply circuit according to the embodiment of the present invention, the square wave output by the 7-pin of the transformer is rectified by the rectifying diode V5 to output a +5V third dc output voltage Uo3, and the voltage Uo3 is used to provide a supply voltage for each module inside the controller N5. The pin 5 of the transformer T1 outputs a square wave, which is rectified by the rectifier VC4, filtered by the capacitors C6, C7, and C8, and then outputs the fourth dc output voltage Uo4 of + 22V. The 3-pin of the transformer T1 outputs square wave, and outputs a fifth direct current output voltage Uo5 of-22V after being rectified by a diode V17 and filtered by a capacitor C12.
The fourth direct current output voltage Uo4 is subjected to voltage stabilization through a three-terminal voltage-stabilizing tube N2 and filtered by a capacitor C9 to output a sixth direct current output voltage Uo6 of +15V, and the fifth direct current output voltage Uo5 is subjected to voltage stabilization through a three-terminal voltage-stabilizing tube N4 and filtered by a capacitor C13 to output a seventh direct current output voltage Uo7 of-15V. The sixth dc output voltage Uo6 and the seventh dc output voltage Uo7 mainly provide working power for each module in the controller inside the switching power supply circuit. The sixth dc output voltage Uo6 of +15V, for example, is used to provide a power supply voltage for the ac input undervoltage detection circuit in the ac input circuit shown in fig. 3, so as to start the ac input detection circuit to detect the PMA three-phase ac voltage, when the PMA three-phase ac power supply is detected to be in the normal operating state, the dc backup power supply stops operating, at this time, the input voltage is provided to the switching power supply circuit by the PMA three-phase ac power supply, and in fig. 4, the power supply voltage to the controller N3 is also switched to be provided by the sixth dc output voltage Uo6 through the diode V9. The diodes V8, V9 form an or gate output which can select either the voltage output by the start circuit or the sixth dc output voltage Uo6 as the supply voltage for the controller N3. The sixth direct current output voltage Uo6 is regulated by a three-terminal regulator N31, filtered by a capacitor C198 and outputs +10V eleventh direct current output voltage Uo11, and the voltage is mainly used for providing an excitation signal for the sensor.
With continued reference to fig. 4, the switching power supply circuit further includes a first feedback detection circuit, configured to detect the third dc output voltage Uo3, and if the third dc output voltage Uo3 is higher than the first reference voltage, output a first feedback detection signal indicating that the control circuit controls the output voltage of the dc-ac conversion circuit to decrease, so as to pull down the third dc output voltage Uo 3. Specifically, the first feedback detection circuit is mainly composed of a comparator N1D, a peripheral resistor, a capacitor, and a diode, and the specific connection relationship thereof can be as shown in fig. 4, the power source of the +5V third dc output voltage Uo3 is input to the negative terminal (pin 10) of the comparator N1D through voltage dividing networks R24 and R29, and the calculation formula is as follows:
Figure BDA0002270985610000091
the positive terminal (pin 11) of the comparator N1D is connected to a reference voltage of 2.5V through a resistor R19. When the third DC output voltage Uo3 rises over 6.25V, U is made toN1-10When the voltage is higher than 2.5V, the first feedback detection signal output by the comparator N1D is at a low level, and at this time, the diode V22 is in forward conduction to further control the conduction of the triode V21, and the pin 1 of the controller N3 in fig. 4 is directly grounded, so that the controllerN3 stops outputting the driving signal to the power switch tube V23, the output of the transformer T1 decreases, thereby decreasing the third dc output voltage Uo3 to realize the feedback control of the third dc output voltage.
The switching power supply circuit further includes a second feedback detection circuit, which is configured to detect the sixth dc output voltage Uo6, and if the sixth dc output voltage Uo6 is lower than a second reference voltage, output a second feedback detection signal indicating that the ac input circuit does not perform chopping control on the ac power supply provided by the ac power supply, so that the dc input voltage rises, thereby controlling the rise of the sixth dc output voltage. Referring to fig. 4, the second feedback detection circuit is mainly composed of a comparator N1C, a peripheral resistor, a capacitor, and a diode. The regulated voltage value UZ of the voltage regulator tube V10 is 5.6V, it can be calculated that the positive terminal 9 pin voltage UN1-9 of the comparator N1C is Uo6-0.7V-5.6V, the negative terminal 8 pin voltage of the comparator N1C is 2.5V reference voltage, when UN1-9 < 2.5V (i.e. Uo6 < 8.7V), the second feedback detection signal output by the comparator N1C is at low level, at this time, the diode V19 is forward conducted, so that the output of the pulse width modulator N5 in fig. 3 is at low level, thus, at this time, the PMA three-phase alternating voltage is not subjected to chopping control, so that the power supply input is raised, thereby increasing the sixth direct current output voltage Uo 6.
With continued reference to fig. 4, the ac-dc converter circuit in fig. 1 is mainly composed of a flyback PWM converter, when the power switch V23 is turned on, the magnetic flux Φ 1 of the primary winding W1 of the transformer T1 (between pins 1 and 2 of T1) increases, the current rises, and when the power switch V23 is turned off, the secondary winding of the transformer T1 outputs current through the coupling inductor. The RC network (R14, C11) connected in parallel on the primary winding is a power supply protection network, so that the reverse peak electromotive force generated by the leakage inductance of the primary winding of the transformer can be eliminated, and the energy in the primary winding is consumed when the output is abnormal.
The first ac-dc conversion circuit in fig. 1 may be mainly implemented by a rectifying circuit formed by diodes, such as the rectifying circuit formed by the diode V5 in fig. 5, and the second ac-dc conversion circuit in fig. 1 may be mainly implemented by a rectifying and filtering circuit, such as the rectifying and filtering circuit formed by the rectifier VC4, the capacitors C6, C7, and C8 in fig. 5. The third ac-dc conversion circuit in fig. 1 is mainly implemented by a rectifying and filtering circuit, such as the rectifying and filtering circuit formed by the diode V17 and the capacitor C12 in fig. 5. The first voltage regulating circuit in fig. 1 is mainly formed by a voltage stabilizing filter circuit, such as the voltage stabilizing filter circuit formed by the three-terminal regulator tube N2 and the capacitor C9 in fig. 5.
Referring to fig. 6, it is a specific implementation circuit diagram of the first path of DC-DC conversion circuit shown in fig. 1, and the circuit is mainly implemented by a DC/DC voltage converter ZHDC28S05H-5W, the circuit has a wide input range (9V-36V), fixed output 5V, output load current as high as 1A, and the configuration circuit is simple, and only filter capacitors are configured at the input and output ends. The partial circuit can be used as an independent power supply output to provide power supply voltage for the protection circuit.
Fig. 7 is a specific implementation circuit of the second path DC-DC conversion circuit shown in fig. 1, which is implemented mainly by using a DC/DC module HFT28S24M, where the module is designed by using a single-ended forward synchronous rectification circuit topology, isolated coupling of a photocoupler, current feedback control, and high power conversion efficiency. The input range is 18V-36V; maximum power of 96W; the over-temperature protection circuit has the functions of input under-voltage, output over-current, output short circuit and over-temperature protection. The configuration circuit is simple, and only the filter capacitors are configured at the input end and the output end.
Fig. 8 is a circuit diagram of an implementation of the first voltage adjustment circuit in fig. 1, which mainly includes a dual voltage regulator N2TPS767D301 and its peripheral circuits. The dual voltage regulator N2TPS767D301 converts the +5V third dc output voltage Uo5 into an eighth dc output voltage Uo8 of +3.3V and a ninth dc output voltage Uo9 of + 1.8V. The eighth dc output voltage Uo1 and the ninth dc output voltage Uo9 of +1.8V may provide the IO supply voltage and the core supply for the DSP.
The enable terminal EN of the dual voltage regulator N2TPS767D301 is active at low level, when the switching power supply circuit is powered on, the regulator 2 outputs 3.3V voltage, and the pin 22 of the dual voltage regulator N2 delays for 200ms to output high level. When the pin 22 of the dual voltage regulator N2TPS767D301 outputs a low level, the diode V2 is turned off, the enable terminal of the dual voltage regulator N2TPS767D301 is pulled high, and the eighth dc output voltage Uo8 has no output; when the dual voltage regulator N2TPS767D301 is high, the diode V2 is turned on, the enable terminal of the dual voltage regulator N2TPS767D301 is pulled low, and the eighth dc output voltage Uo8 has an output.
The resistor R3 and the resistor R6 form an output adjusting resistor network, the first eight direct current output voltage Uo8 is subjected to voltage division and sampling, the sampling value is compared with the internal reference voltage Vref (1.1834V) of the dual-voltage adjuster N2TPS767D301, and the calculation formula is as follows:
Figure BDA0002270985610000101
calculated Uo8 ═ 1.8046V.
Fig. 9 is a specific implementation circuit diagram of the third voltage adjustment circuit in fig. 1, where the +3.3V voltage is converted into an eleventh dc output voltage Uo11 of +1.2V through a voltage regulator N1TPS7a9001DSKT, which may provide core power for the FPGA.
The input range of the regulator N1TPS7A9001DSKT is 1.4V-6.5V, and the output voltage is adjustable and ranges from 0.8V-5.7V. EN is the enable terminal, and high is active. FB is an output feedback signal, which is input to the inverting input terminal of the regulator N1TPS7a9001DSKT internal error amplifier, and the non-inverting input terminal of the regulator N1TPS7a9001DSKT internal error amplifier is an internal reference voltage Vref (0.8V). According to the principle of virtual break and virtual short, VFB is Vref. The output of the output adjusting network formed by the resistor R4 and the resistor R5 is adjusted, and the calculation formula is as follows:
Figure BDA0002270985610000102
calculated Uo11 ═ 1.2V.
The invention also provides airborne equipment which mainly comprises any one of the switching power supply circuits provided by the invention.
Therefore, according to the switching power supply circuit and the airborne equipment provided by the invention, when the alternating-current input power supply is in an abnormal working state, the standby power supply provides the input direct-current voltage for the switching power supply circuit so that the switching power supply circuit converts the input direct-current voltage into a plurality of direct-current output voltages for the switching power supply circuit and the airborne equipment to use, and the switching power supply circuit is also provided with the under-voltage detection circuit so as to monitor the safety of the switching power supply circuit in real time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A switching power supply circuit, comprising:
an input stage circuit for providing a DC input voltage,
a voltage conversion circuit for converting the DC input voltage into a DC output voltage and outputting the DC output voltage,
a control circuit that controls the voltage conversion circuit to convert the DC input voltage to a desired DC output voltage,
wherein the input stage circuit comprises an AC input circuit and a DC input circuit,
the alternating current input circuit is used for converting alternating current voltage provided by an alternating current power supply into the direct current input voltage and inputting the direct current input voltage into the voltage conversion circuit,
when the alternating current input circuit cannot be in a normal working state, the direct current input circuit inputs the voltage provided by the standby direct current power supply to the voltage conversion circuit as the direct current input voltage;
the voltage conversion circuit comprises a first-stage voltage conversion circuit and a second-stage voltage conversion circuit, wherein the first-stage voltage conversion circuit comprises at least one path of direct current-alternating current conversion circuit and at least one path of direct current-direct current conversion circuit, the direct current input voltage is converted into first-stage alternating current output voltage to be output, the direct current-direct current conversion circuit is used for converting the direct current input voltage into first-stage direct current output voltage to be output, and the second-stage voltage conversion circuit comprises at least one path of alternating current-direct current conversion circuit and is used for converting the first-stage alternating current output voltage into second-stage direct current output voltage to be output;
the first-stage voltage conversion circuit comprises a direct current-alternating current conversion circuit, a first direct current-direct current conversion circuit and a second direct current-direct current conversion circuit which are parallel, the second-stage voltage conversion circuit comprises a first alternating current-direct current conversion circuit, a second alternating current-direct current conversion circuit and a third alternating current-direct current conversion circuit which are parallel, wherein the first direct current-direct current conversion circuit is used for converting the direct current input voltage into a first direct current output voltage output and providing independent power supply for the protection circuit, the second direct current-direct current conversion circuit is used for converting the direct current input voltage into a second direct current output voltage output and providing power supply for the stepping motor, the first alternating current-direct current conversion circuit is used for converting the first-stage alternating current output voltage into a third direct current output voltage output, the second AC-DC conversion circuit is used for converting the first-stage AC output voltage into a fourth DC output voltage for output, and the third AC-DC conversion circuit is used for converting the first-stage AC output voltage into a fifth DC output voltage for output;
the voltage conversion circuit further includes: the first voltage stabilizing circuit is used for converting the fourth direct current output voltage into a sixth direct current output voltage for output, the second voltage stabilizing circuit is used for converting the fifth direct current output voltage into a seventh direct current output voltage for output, the first voltage adjusting circuit is used for converting the third direct current output voltage into an eighth direct current output voltage and a ninth direct current output voltage for output, the second voltage adjusting circuit is used for converting the ninth direct current output voltage into a tenth direct current output voltage for output, and the third voltage adjusting circuit is used for converting the sixth direct current output voltage into an eleventh direct current output voltage for output;
further comprising: a first feedback detection circuit, configured to detect the third dc output voltage, and instruct the control circuit to control the output voltage of the dc-ac conversion circuit to decrease if the third dc output voltage is higher than a first reference voltage, so as to pull down the third dc output voltage;
a second feedback detection circuit, configured to detect the sixth dc output voltage, and if the sixth dc output voltage is lower than a second reference voltage, instruct the ac input circuit not to perform chopping control on the ac voltage provided by the ac power supply, so as to increase the dc input voltage, and thus control the increase of the sixth dc output voltage;
the first feedback detection circuit is composed of a comparator N1D, a peripheral resistor, a capacitor and a diode, a third direct current output voltage is input to a No. 10 pin of the comparator N1D after passing through a voltage division network R24 and R29, and the calculation formula is as follows:
Figure FDA0003191326200000021
no. 11 pin of the comparator N1D is connected with the reference voltage of 2.5V through a resistor R19, and when the third direct current output voltage rises to exceed 6.25V, U is enabledN1-10When the voltage is higher than 2.5V, the first feedback detection signal output by the comparator N1D is at a low level, and at this time, the diode V22 is in forward conduction, so that the triode V21 is controlled to be in conduction, and the pin 1 of the controller N3 of the control circuit is directly grounded, so that the controller N3 stops outputting the driving signal to the power switch tube V23 in the dc-ac conversion circuit, and the output of the transformer T1 in the dc-ac conversion circuit is reduced, so that the third dc output voltage is reduced, and the feedback control of the third dc output voltage is realized;
the second feedback detection circuit is composed of a comparator N1C, a peripheral resistor, a capacitor and a diode, wherein the voltage stabilizing value of a voltage stabilizing tube V10 is 5.6V, and the No. 9 of the comparator N1C can be obtained through calculationPin voltage UN1-9When the voltage of pin 8 of the comparator N1C is the reference voltage of 2.5V when U is equal to the sixth dc output voltage of-0.7V-5.6VN1-9When the voltage is less than 2.5V, the second feedback detection signal output by the comparator N1C is at a low level, and at this time, the diode V19 is in forward conduction, so that the output of the pulse width modulator N5 in the ac input circuit is at a low level, and thus, the chopping control is not performed on the PMA three-phase ac voltage at this time, so that the power supply input is raised, and the sixth dc output voltage is increased.
2. The switching power supply circuit according to claim 1,
the alternating current input circuit comprises a three-phase half-wave rectifying circuit, an alternating current input undervoltage detection circuit and an input PWM control circuit,
the input PWM control circuit is used for controlling the three-phase half-wave rectification circuit to convert the three-phase alternating voltage output by the PMA three-phase alternating current power supply into the stable direct current input voltage,
the alternating current input undervoltage detection circuit is used for detecting whether the three-phase alternating current voltage is in an undervoltage state or not,
the direct current input circuit comprises a common mode filter circuit, a safety circuit and a differential mode inductance filter output circuit which are connected in sequence, and also comprises a direct current input undervoltage detection circuit,
the voltage of the standby direct-current power supply is input to the direct-current input circuit from the common-mode filter circuit and is output by the differential-mode inductance filter output circuit, and the direct-current input under-voltage detection circuit is used for detecting whether the voltage of the standby direct-current power supply is in an under-voltage state or not.
3. The switching power supply circuit according to claim 1, wherein in a power-on initial stage of the switching power supply circuit, the dc input voltage outputted by the dc input circuit provides a power supply voltage to the switching power supply circuit through a start circuit inside the switching power supply circuit to start the switching power supply circuit, until the ac input circuit is in a normal operating state, the dc input circuit stops operating, and the ac input circuit outputs the dc input voltage,
after the switching power supply circuit is started, the direct current input voltage is converted into the power supply voltage of the switching power supply circuit through the voltage conversion circuit.
4. The switching power supply circuit according to claim 2, wherein the ac input undervoltage detection circuit detects whether the three-phase ac voltage is in an undervoltage state by detecting a magnitude of a first phase voltage of the three-phase ac voltage.
5. The switching power supply circuit according to claim 1, wherein the control circuit receives the third dc output voltage and controls a switching state of a power switch in the dc-ac conversion circuit according to the third dc output voltage, so as to control the dc output voltage output by each of the ac-dc conversion circuits to be maintained at a desired value.
6. An onboard apparatus comprising a switching power supply circuit as claimed in any one of claims 1 to 5.
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CN205265547U (en) * 2015-12-31 2016-05-25 陕西烽火电子股份有限公司 Machine carries AC -DC power supply changeover device
CN207603294U (en) * 2017-11-28 2018-07-10 嘉兴伏尔电子科技有限公司 The power-supply management system of Switching Power Supply in a kind of energy storage inverter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090099397A (en) * 2008-03-17 2009-09-22 (주)씨이에스티 Power saving type power source supply for controlling of integration power source
CN201893714U (en) * 2010-12-24 2011-07-06 东莞市盈聚电子有限公司 Multiplexed output switching power supply
CN202652086U (en) * 2012-06-01 2013-01-02 四川极度电控系统制造有限责任公司 Flyback multiplexed output switching power supply
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