CN110289608B - Power supply circuit and power supply with direct-in and direct-out function - Google Patents

Power supply circuit and power supply with direct-in and direct-out function Download PDF

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Publication number
CN110289608B
CN110289608B CN201910565588.8A CN201910565588A CN110289608B CN 110289608 B CN110289608 B CN 110289608B CN 201910565588 A CN201910565588 A CN 201910565588A CN 110289608 B CN110289608 B CN 110289608B
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circuit
input
reflection
output
positive
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CN110289608A (en
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陈月华
王灿然
李秀楼
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Shenzhen Honor Electronic Co ltd
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Shenzhen Honor Electronic Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention relates to a power supply circuit and a power supply for direct-in and direct-out, comprising: the power supply system comprises an input end for accessing electric energy and an output end for outputting the electric energy, and further comprises an input anti-reflection circuit, a main energy storage circuit and an output anti-reflection circuit which are sequentially connected between the input end and the output end; the input end comprises an input positive end and an input negative end, the input positive end is connected with the positive end of an external circuit for providing electric energy, and the input negative end is connected with the negative end of the external circuit; the output end comprises an output positive end and an output negative end, the output positive end is connected with the positive end of the load, and the output negative end is connected with the negative end of the load. Through designing this power supply circuit that directly goes into and directly goes out, effectively improved the conversion efficiency of power, reduce the consumption, heat dissipation and the part specification demand of power, reduce the volume requirement of power, can satisfy the miniaturized demand of power.

Description

Power supply circuit and power supply with direct-in and direct-out function
Technical Field
The invention relates to the technical field of power supplies, in particular to a direct-in and direct-out power supply circuit and a power supply.
Background
Due to development and application of the 5G technology, the switching power supply in the power supply system is promoted to require outputting higher power, the size is smaller, and if the power supply based on 48V power supply adopts the traditional isolation conversion control, the input 48V is boosted and then is subjected to DC-DC isolation conversion to output 48V, so that the efficiency of the power supply after the integral conversion is reduced as follows: 94% (boost circuit efficiency) ×97% (DC-DC conversion efficiency) =91%, and the reduction of efficiency will directly cause problems of power consumption increase and heating of the power supply, so that large power output is difficult to realize under the same size condition, and the performance and application of the power supply are directly reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a power supply circuit and a power supply with direct input and direct output aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows: provided is a direct-in and direct-out power supply circuit applied to a power supply, comprising: the power supply system comprises an input end for accessing electric energy and an output end for outputting the electric energy, and further comprises an input anti-reflection circuit, a main energy storage circuit and an output anti-reflection circuit which are sequentially connected between the input end and the output end;
the input end comprises an input positive end and an input negative end, wherein the input positive end is connected with the positive end of an external circuit for providing electric energy, and the input negative end is connected with the negative end of the external circuit; the output end comprises an output positive end and an output negative end, the output positive end is connected with the positive end of the load, and the output negative end is connected with the negative end of the load;
the input anti-reflection circuit is used for controlling anti-reflection of the input side when the power supply is in parallel operation, the main energy storage circuit is used for providing maintenance time energy of the power supply main circuit when the power supply is in power-off operation, and the output anti-reflection circuit is used for controlling anti-reflection of the output side when the power supply is in parallel operation.
In one embodiment, the input anti-reflection circuit includes: the input positive end anti-reflection circuit, the first control circuit and the input negative end anti-reflection circuit;
the second end of the input positive end anti-reflection circuit is connected with the input positive end, the first end of the input positive end anti-reflection circuit is connected with the first end of the main energy storage circuit, the third end of the input positive end anti-reflection circuit is connected with the control end of the first control circuit, the first detection end of the first control circuit is connected with the second end of the input positive end anti-reflection circuit and is connected to the input positive end, and the second detection end of the first control circuit is connected with the first end of the main energy storage circuit;
the first end of the input negative end anti-reflection circuit is connected with the input negative end, the second end of the input negative end anti-reflection circuit is connected with the second end of the main energy storage circuit, and the third end of the input negative end anti-reflection circuit is connected with the input negative end anti-reflection control circuit.
In one embodiment, the input positive-end anti-reflection circuit comprises a first MOS tube, the first control circuit comprises a first control IC, and the input-end anti-reflection circuit comprises a fourth MOS tube;
the second end of the first MOS tube is connected with the input positive end, the first end of the first MOS tube is connected with the first end of the main energy storage circuit, the third end of the first MOS tube is connected with the control end of the first control IC, the first detection end of the first control IC is connected with the second end of the first MOS tube and is connected with the input positive end, and the second detection end of the first control IC is connected with the first end of the main energy storage circuit;
the first end of the fourth MOS tube is connected with the input negative end, the second end of the fourth MOS tube is connected with the second end of the main energy storage circuit, and the third end of the fourth MOS tube is connected with the input negative end anti-reverse control circuit.
In one embodiment, the output anti-reflection circuit includes: the output positive end anti-reflection circuit, the second control circuit and the output negative end anti-reflection circuit;
the second end of the output positive end anti-reflection circuit is connected with the first end of the main energy storage circuit, the first end of the output positive end anti-reflection circuit is connected with the output positive end, the third end of the output positive end anti-reflection circuit is connected with the control end of the second control circuit, the first detection end of the second control circuit is connected with the second end of the output positive end anti-reflection circuit and is connected with the first end of the main energy storage circuit, and the second detection end of the second control circuit is connected with the output positive end;
the first end of the output negative end anti-reflection circuit is connected with the second end of the main energy storage circuit, the second end of the output negative end anti-reflection circuit is connected with the output negative end, and the third end of the output negative end anti-reflection circuit is connected with the output negative end anti-reflection control circuit.
In one embodiment, the output positive-end anti-reflection circuit comprises a second MOS tube, the second control circuit comprises a second control IC, and the output negative-end anti-reflection circuit comprises a sixth MOS tube;
the second end of the second MOS tube is connected with the first end of the main energy storage circuit, the first end of the second MOS tube is connected with the output positive end, the third end of the second MOS tube is connected with the control end of the second control IC, the first detection end of the second control IC is connected with the second end of the output positive end anti-reflection circuit and is connected with the first end of the main energy storage circuit, and the second detection end of the second control IC is connected with the output positive end;
the first end of the sixth MOS tube is connected with the second end of the main energy storage circuit, the second end of the sixth MOS tube is connected with the output negative end, and the third end of the sixth MOS tube is connected with the output negative end anti-reverse control circuit.
In one embodiment, the device further comprises a startup and shutdown control circuit;
the second end of the on-off control circuit is connected with the second end of the input negative end anti-reflection circuit, the first end of the on-off control circuit is connected with the second end of the main energy storage circuit, and the third end of the on-off control circuit is connected with the control end of the main control circuit.
In one embodiment, the on-off control circuit includes a fifth MOS transistor;
the second end of the fifth MOS tube is connected with the second end of the negative input end anti-reflection circuit, the first end of the fifth MOS tube is connected with the second end of the main energy storage circuit, and the third end of the fifth MOS tube is connected with the control end of the main control circuit.
In one embodiment, further comprising: an auxiliary circuit and a startup anti-surge circuit;
the first end of the auxiliary circuit is respectively connected with the first end of the input positive end anti-reflection circuit and the first end of the main energy storage circuit, the second end of the auxiliary circuit is grounded, and the third end of the auxiliary circuit outputs auxiliary electric energy;
the first end of the startup anti-surge circuit is connected with the first end of the startup control circuit, and the second end of the startup anti-surge circuit is connected with the second end of the main energy storage circuit.
In one embodiment, the auxiliary circuit comprises: the first diode, auxiliary anti-surge circuit and auxiliary energy storage circuit;
the positive pole of first diode is connected the input positive end prevents the first end of reverse circuit with the first end of main tank circuit, the first end of supplementary surge protection circuit is connected the negative pole of first diode, the second end of supplementary surge protection circuit is connected the positive end of supplementary tank circuit, the second ground connection of supplementary tank circuit, the second end of supplementary surge protection circuit and the positive end of auxiliary tank circuit of quivering are regarded as the third end output auxiliary electric energy of auxiliary circuit.
In one embodiment, further comprising: an overcurrent protection circuit;
the first end of the overcurrent protection circuit is connected with the input positive end, and the second end of the overcurrent protection circuit is connected with the second end of the input positive end anti-reflection circuit.
In one embodiment, further comprising: an EMI protection circuit; the EMI protection circuit includes: the first filter capacitor, the second filter capacitor and the common mode inductor;
the first end of the first filter capacitor is connected with the first end of the overcurrent protection circuit, the second end of the first filter capacitor is connected with the first end of the second filter capacitor, the second end of the second filter capacitor is connected with the negative input end, and the second end of the first filter capacitor and the first end of the second filter capacitor are also connected to ground;
the fourth end of the common-mode inductor is connected with the second end of the overcurrent protection circuit, the first end of the common-mode inductor is connected with the second end of the input positive-end anti-reflection circuit, the third end of the common-mode inductor is connected with the input negative end, and the second end of the common-mode inductor is connected with the first end of the input negative-end anti-reflection circuit.
The invention also provides a power supply, which comprises the direct-in and direct-out power supply circuit.
The power supply circuit for the direct-in and direct-out has the following beneficial effects: the power supply circuit of this straight income straight out includes: the power supply system comprises an input end for accessing electric energy and an output end for outputting the electric energy, and further comprises an input anti-reflection circuit, a main energy storage circuit and an output anti-reflection circuit which are sequentially connected between the input end and the output end; the input end comprises an input positive end and an input negative end, the input positive end is connected with the positive end of an external circuit for providing electric energy, and the input negative end is connected with the negative end of the external circuit; the output end comprises an output positive end and an output negative end, the output positive end is connected with the positive end of the load, and the output negative end is connected with the negative end of the load. Through designing this power supply circuit that directly goes into and directly goes out, effectively improved the conversion efficiency of power, reduce the consumption, heat dissipation and the part specification demand of power, reduce the volume requirement of power, can satisfy the miniaturized demand of power.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic block diagram of an embodiment of a DC-DC power supply circuit according to the present invention;
FIG. 2 is a schematic block diagram of another embodiment of a DC-DC power supply circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a direct-in direct-out power supply circuit according to the present invention;
FIG. 4 is a schematic diagram of an example of a power supply employing a common power supply with both positive and negative power supplies;
FIG. 5 is a schematic circuit diagram of another example of using the same power source to connect two power sources in a positive-negative direction;
fig. 6 is a schematic diagram of a circuit for normally accessing two power supplies using the same power supply.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to meet the requirements of a client on small size and high power output of a power supply, the invention adjusts the traditional isolation conversion form into a direct-in direct-out form so as to obtain about 99% conversion efficiency, directly reduces the power consumption and heat dissipation requirements of the power supply, and meets the requirement of miniaturization of the power supply.
Specifically, as shown in fig. 1, the power supply circuit for direct in and direct out includes: the input end for connecting the electric energy and the output end for outputting the electric energy further comprise an input anti-reflection circuit 30, a main energy storage circuit 40 and an output anti-reflection circuit 50 which are sequentially connected between the input end and the output end.
The input end comprises an input positive end and an input negative end, the input positive end is connected with the positive end of an external circuit for providing electric energy, and the input negative end is connected with the negative end of the external circuit; the output end comprises an output positive end and an output negative end, the output positive end is connected with the positive end of the load, and the output negative end is connected with the negative end of the load.
The input anti-reflection circuit 30 is used for controlling anti-reflection of the input side when the power supply is turned on, the main energy storage circuit 40 is used for providing maintenance time energy of the power supply main circuit when the power supply is turned off, and the output anti-reflection circuit 50 is used for controlling anti-reflection of the output side when the power supply is turned on.
In some embodiments, the external circuit providing power may be a direct current source or a battery, wherein the positive input terminal is connected to the positive terminal of the direct current source or battery and the negative input terminal is connected to the negative terminal of the direct current source or battery to switch in the power output by the direct current source or battery.
Further, as shown in fig. 2, the input anti-reflection circuit 30 includes: an input positive side anti-reflection circuit 31, a first control circuit 32, and an input negative side anti-reflection circuit 33.
The second end of the input positive end anti-reflection circuit 31 is connected with the input positive end, the first end of the input positive end anti-reflection circuit 31 is connected with the first end of the main energy storage circuit 40, the third end of the input positive end anti-reflection circuit 31 is connected with the control end of the first control circuit 32, the first detection end of the first control circuit 32 is connected with the second end of the input positive end anti-reflection circuit 31 and is connected to the input positive end, and the second detection end of the first control circuit 32 is connected with the first end of the main energy storage circuit 40.
The first detection end of the first control circuit 32 detects a forward current flowing through the input positive anti-reflection circuit 31, and outputs a driving voltage to the third end of the input positive anti-reflection circuit 31 when the forward current is detected, so as to control the input positive anti-reflection circuit 31 to be turned on; the second detection end of the first control circuit 32 detects a reverse current flowing through the input positive anti-reverse circuit 31, and pulls down the third end level of the input positive anti-reverse circuit 31 when the reverse current is detected, so as to reversely turn off the driving, and make the input positive anti-reverse circuit 31 in a turned-off state, and the reverse current cannot pass through the input positive anti-reverse circuit 31 and return to the input positive.
The first end of the negative input terminal anti-reflection circuit 33 is connected with the negative input terminal, the second end of the negative input terminal anti-reflection circuit 33 is connected with the second end of the main energy storage circuit 40, and the third end of the negative input terminal anti-reflection circuit 33 is connected with the negative input terminal anti-reflection control circuit.
The negative input terminal anti-reverse control circuit outputs an anti-reverse driving signal to the negative input terminal anti-reverse circuit 33 to control the on or off of the negative input terminal anti-reverse circuit 33.
Further, as shown in fig. 2, the output anti-reflection circuit 50 includes: an output positive side anti-reflection circuit 51, a second control circuit 52, and an output negative side anti-reflection circuit 53.
The second end of the output positive end anti-reflection circuit 51 is connected with the first end of the main energy storage circuit 40, the first end of the output positive end anti-reflection circuit 51 is connected with the output positive end, the third end of the output positive end anti-reflection circuit 51 is connected with the control end of the second control circuit 52, the first detection end of the second control circuit 52 is connected with the second end of the output positive end anti-reflection circuit 51 and is connected to the first end of the main energy storage circuit 40, and the second detection end of the second control circuit 52 is connected with the output positive end.
The first detection end of the second control circuit 52 detects a forward current flowing through the output positive anti-reflection circuit 51, and outputs a driving voltage to the third end of the output positive anti-reflection circuit 51 when the forward current is detected, so as to control the output positive anti-reflection circuit 51 to be turned on; the second detection end of the second control circuit 52 detects the reverse current flowing through the output positive anti-reflection circuit 51, and pulls down the third end level of the output positive anti-reflection circuit 51 when the reverse current is detected, so as to reversely turn off the driving, and make the output positive anti-reflection circuit 51 in a turned-off state, and the reverse current cannot pass through the output positive anti-reflection circuit 51.
The first end of the output negative end anti-reflection circuit 53 is connected with the second end of the main energy storage circuit 40, the second end of the output negative end anti-reflection circuit 53 is connected with the output negative end, and the third end of the output negative end anti-reflection circuit 53 is connected with the output negative end anti-reflection control circuit.
The negative output end anti-reverse control circuit outputs a negative output end anti-reverse driving signal to the negative output end anti-reverse circuit 53 to control the negative output end anti-reverse circuit 53 to be turned on or turned off.
Further, as shown in fig. 2, the power supply circuit for direct in and direct out further includes: an overcurrent protection circuit 10.
The first end of the overcurrent protection circuit 10 is connected to the input positive terminal, and the second end of the overcurrent protection circuit 10 is connected to the second end of the input positive terminal anti-reflection circuit 31.
Further, as shown in fig. 2, the power supply circuit for direct in and direct out further includes:
an EMI protection circuit 20; the EMI protection circuit 20 includes: the first filter capacitor, the second filter capacitor and the common mode inductor.
The first end of the first filter capacitor is connected with the first end of the overcurrent protection circuit 10, the second end of the first filter capacitor is connected with the first end of the second filter capacitor, the second end of the second filter capacitor is connected with the input negative end, and the second end of the first filter capacitor and the first end of the second filter capacitor are also connected to the ground.
The fourth end of the common-mode inductor is connected to the second end of the overcurrent protection circuit 10, the first end of the common-mode inductor is connected to the second end of the input positive-end anti-reflection circuit 31, the third end of the common-mode inductor is connected to the input negative end, and the second end of the common-mode inductor is connected to the first end of the input negative-end anti-reflection circuit 33.
EMI protection suppression can be achieved by providing EMI protection circuit 20 to eliminate interference of high frequency signals with the power supply.
Further, as shown in fig. 2, the power supply circuit for direct in and direct out further includes: auxiliary circuitry 60 and a power on anti-surge circuit 70.
The first end of the auxiliary circuit 60 is respectively connected with the first end of the input positive end anti-reflection circuit 31 and the first end of the main energy storage circuit 40, the second end of the auxiliary circuit 60 is grounded, and the third end of the auxiliary circuit 60 outputs auxiliary electric energy; a first terminal of the startup anti-surge circuit 70 is connected to a first terminal of the startup control circuit 80, and a second terminal of the startup anti-surge circuit 70 is connected to a second terminal of the main tank circuit 40.
In some embodiments, the auxiliary circuit 60 includes: the power supply comprises a first diode, an auxiliary anti-surge circuit and an auxiliary energy storage circuit.
The positive pole of first diode is connected to the first end of input positive end anti-reverse circuit 31 and the first end of main tank circuit 40, and the negative pole of first diode is connected to the first end of supplementary anti-surge circuit, and the positive end of supplementary tank circuit is connected to the second end of supplementary anti-surge circuit, and the second end of supplementary anti-surge circuit and the positive end of auxiliary tank circuit of quivering are as the third end output auxiliary power of auxiliary circuit 60.
The first diode can prevent the auxiliary circuit 60 from being discharged when the output is shorted, so that the auxiliary circuit 60 does not maintain the energy required by the protection response control, and the output cannot be effectively turned off.
In some embodiments, the auxiliary anti-surge circuit is used for preventing surge current of the auxiliary circuit 60 in the auxiliary circuit 60 from being impacted, so as to ensure the safety of the device. Wherein, auxiliary anti-surge circuit can be realized through thermistor.
In some embodiments, an auxiliary tank circuit is used to provide auxiliary power instantaneously for maintenance energy in response to control demand when protection such as an output short circuit.
In some embodiments, the power-on anti-surge circuit 70 is used for controlling surge current impact at the moment of power-on and ensuring the safety of devices in the circuit. The startup anti-surge circuit 70 may be realized by a thermistor.
Further, as shown in fig. 2, the power supply circuit for direct in and direct out further includes: and a power on/off control circuit 80.
The second end of the on-off control circuit 80 is connected with the second end of the negative input end anti-reverse circuit 33, the first end of the on-off control circuit 80 is connected with the second end of the main energy storage circuit 40, and the third end of the on-off control circuit 80 is connected with the control end of the main control circuit.
In some embodiments, the on-off control circuit 80 is configured to perform on-off control during on-off and protection of the power supply, so as to ensure that the power supply can perform a corresponding function.
In the embodiment of the invention, the main control circuit comprises an MCU which is a main control IC of a power supply.
This power supply circuit who directly goes into directly going out makes it can satisfy the overall performance demand of power through setting up above-mentioned functional circuit, has still avoided simultaneously to step up and DC-DC conversion, effectively promotes the conversion efficiency of power, has reduced the heat dissipation and the part specification demand of power, has also reduced the volume requirement of power for the power that sets up this power supply circuit that directly goes into directly going out can realize the requirement of small-size high power output, satisfies the demand of customer end to miniaturization, the high power output of power.
Further, fig. 3 shows a schematic circuit diagram of an embodiment of the dc-in-dc-out power supply circuit provided by the present invention.
As shown in fig. 3, in this embodiment, the overcurrent protection circuit 10 includes a fuse F1, and the EMI protection circuit 20 includes a first filter capacitor CY1, a second filter capacitor CY2, and a common-mode inductance LF1. The input positive-side anti-reflection circuit 31 includes a first MOS transistor Q1, the first control circuit 32 includes a first control IC (U1), and the input-side anti-reflection circuit includes a fourth MOS transistor Q4.
The auxiliary circuit 60 includes: the first diode D1, the auxiliary anti-surge circuit includes: the first thermistor THR1, the auxiliary tank circuit includes: and a third capacitor C3. The power on/off control circuit 80 includes: fifth MOS transistor Q5. The main tank circuit 40 includes: a first capacitor C1. The startup surge protection circuit 70 includes: and a second thermistor THR2.
The output positive side anti-reflection circuit 51 includes: a second MOS transistor Q2 and a second control IC (U2). The output negative side anti-reflection circuit 53 includes: sixth MOS transistor Q6.
As shown in fig. 3, the fuse F1 is disposed at the input positive terminal, and can be fused when there is a long-time overcurrent at the long input positive terminal to protect the internal devices of the power supply and prevent the fire phenomenon.
Further, as shown in fig. 3, a first terminal of the fuse F1 is connected to the input positive terminal, and a second terminal of the fuse F1 is connected to a fourth terminal of the common-mode inductor LF1.
The first end of the first filter capacitor CY1 is connected with the first end of the fuse F1, the second end of the first filter capacitor CY1 is connected with the first end of the second filter capacitor CY2, the second end of the second filter capacitor CY2 is connected with the input negative end, and the second end of the first filter capacitor CY1 and the first end of the second filter capacitor CY2 are also connected to the ground. The first end of the common-mode inductor LF1 is connected to the second end (the second end of the first MOS transistor Q1) of the input positive-side anti-reflection circuit 31, the third end of the common-mode inductor LF1 is connected to the input negative end, and the second end of the common-mode inductor LF1 is connected to the first end (the first end of the fourth MOS transistor Q4) of the input negative-side anti-reflection circuit 33.
The second end of the first MOS transistor Q1 is connected to the input positive terminal (in the embodiment shown in fig. 3, the second end of the first MOS transistor Q1 is connected to the first end of the common-mode inductor LF 1), the first end of the first MOS transistor Q1 is connected to the first end of the main tank circuit 40 (the first capacitor C1), the third end of the first MOS transistor Q1 is connected to the control end (the 5 th pin of U1) of the first control IC, the first detection end (the 4 th pin of U1) of the first control IC is connected to the second end of the first MOS transistor Q1 and is connected to the input positive terminal, and the second detection end (the 6 th pin of U1) of the first control IC is connected to the first end of the main tank circuit 40 (the first capacitor C1).
The first end of the fourth MOS transistor Q4 is connected with the input negative terminal, the second end of the fourth MOS transistor Q4 is connected with the second end of the main energy storage circuit 40 (the first capacitor C1), and the third end of the fourth MOS transistor Q4 is connected with the input negative terminal anti-reverse control circuit.
In the embodiment of the invention, the input negative terminal anti-reverse control circuit can adopt an IC which is the same as U1, or can also adopt an IC with the same function as U1.
The second end of the second MOS tube Q2 is connected with the first end of the main energy storage circuit 40, the first end of the second MOS tube Q2 is connected with the output positive end, the third end of the second MOS tube Q2 is connected with the control end (the 5 th pin of U2) of the second control IC (U2), the first detection end (the 4 th pin of U2) of the second control IC is connected with the second end of the output positive end anti-reflection circuit 51 (the first MOS tube Q1) and is connected with the first end of the main energy storage circuit 40, and the second detection end (the 6 th pin of U2) of the second control IC is connected with the output positive end;
the first end of the sixth MOS tube Q6 is connected with the second end of the main energy storage circuit 40, the second end of the sixth MOS tube Q6 is connected with the output negative end, and the third end of the sixth MOS tube is connected with the output negative end anti-reverse control circuit.
In the embodiment of the invention, the input negative terminal anti-reverse control circuit can adopt an IC which is the same as U2, or can also adopt an IC with the same function as U2.
The positive pole of first diode D1 connects the first end of first MOS pipe Q1, and first thermistor THR 1's first end is connected to first diode D1's negative pole, and third electric capacity C3's first end is connected to first thermistor THR 1's second end, and third electric capacity C3's second ground connection, and auxiliary electric energy is exported to the link of first thermistor THR 1's second end and third electric capacity C3's first end.
The second end of the fifth MOS transistor Q5 is connected to the second end of the negative input end anti-reflection circuit 33 (the fourth MOS transistor Q4), the first end of the fifth MOS transistor Q5 is connected to the second end of the main tank circuit 40 (in the embodiment of fig. 3, the first end of the fifth MOS transistor Q5 may be connected to the second end of the first capacitor C1 through the second thermistor THR 2), and the third end of the fifth MOS transistor Q5 is connected to the control end of the main control circuit.
Further, the load connected to the direct-in and direct-out power supply circuit in the embodiment of the invention can be a resistive load or a capacitive load.
The invention also provides a power supply which can be a switching power supply, and further comprises the direct-in and direct-out power supply circuit disclosed by the embodiment of the invention. Through setting up this power supply circuit that directly goes into and directly goes out, the conversion efficiency of this power is obviously promoted, and heat dissipation and part specification demand all reduce, and the volume requirement also reduces, can satisfy the miniaturized, the high power requirement of customer end.
The direct-in and direct-out power supply circuit provided by the embodiment of the invention solves the EMI interference suppression and startup surge current limitation requirements of the power supply, realizes the energy requirement in the auxiliary power supply protection control response time, solves various parallel operation (same power supply and different power supplies) and anti-reverse protection control, and improves the conversion efficiency of the power supply in amplitude.
The following describes embodiments of the present invention in terms of various aspects.
As shown in fig. 4, to adopt the same power supply to connect two power supplies in a positive-negative manner, when the second power supply PSU2 is not provided with the input positive-end anti-reverse circuit 31, the first power supply PSU1 outputs a positive end to a load through the fuse F1, the common-mode inductor LF1, the first MOS transistor Q1, the second MOS transistor Q2; the second power PSU2 returns to the negative terminal of the reverse connection through the sixth MOS transistor Q6, the first capacitor C1, the common-mode inductor LF1, and the fuse F1, so as to cause the problems of power supply damage and functional failure caused by load current disturbance.
As shown in fig. 5, to connect the same power source to two power sources, when the second power PSU2 is not provided with the input positive-end anti-reflection circuit 31 and the output positive-end anti-reflection circuit 51, the first power PSU1 will pass through the fuse F1, the common-mode inductor LF1, the first MOS transistor Q1, the second MOS transistor Q2 and the output positive end to the load; the second power PSU2 directly returns to the negative terminal of the reverse connection via the common-mode inductor LF1 and the fuse F1, which causes the input source short circuit.
As shown in fig. 6, to normally connect two power supplies with the same power supply, when the second power supply PSU2 is not provided with the output positive-end anti-reflection circuit 51 and the output negative-end anti-reflection circuit 53, the first power supply PSU1 powered on firstly charges the energy storage of the second power supply PSU2 instantly through the fuse F1, the common-mode inductor LF1, the first MOS transistor Q1, the second MOS transistor Q2, the output positive end to the load, and returns to the negative end of the load through the first capacitor C1 of the second power supply PSU2, and then returns to the input negative end through the sixth MOS transistor Q6, the fifth MOS transistor Q5, the fourth MOS transistor Q4 and the common-mode inductor LF1 of the first power supply PSU1, so that the phenomena of excessive plug-in and spark or power damage of the instant current are caused.
However, the power supply circuit for direct input and direct output in the embodiment of the invention can solve the problems and realize the functions of stable direct input and direct output power supply, parallel operation and the like. Of course, it can be understood that the power supply circuit with the direct input and direct output of the embodiment of the present invention can solve the above-mentioned problems, and can also solve the use of the power supply and the protection of the abnormal situation in other situations.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.

Claims (9)

1. A power supply circuit for direct in and direct out, applied to a power supply, comprising: the power supply system comprises an input end for accessing electric energy and an output end for outputting the electric energy, and further comprises an input anti-reflection circuit, a main energy storage circuit and an output anti-reflection circuit which are sequentially connected between the input end and the output end; the power-on/off control circuit, the auxiliary circuit, the power-on anti-surge circuit, the overcurrent protection circuit and the EMI protection circuit are also included; the input end comprises an input positive end and an input negative end, wherein the input positive end is connected with the positive end of an external circuit for providing electric energy, and the input negative end is connected with the negative end of the external circuit; the output end comprises an output positive end and an output negative end, the output positive end is connected with the positive end of the load, and the output negative end is connected with the negative end of the load;
the input anti-reflection circuit is used for controlling anti-reflection of the input side when the power supply is in parallel operation, the main energy storage circuit is used for providing maintenance time energy of the power supply main circuit when the power supply is in power off operation, and the output anti-reflection circuit is used for controlling anti-reflection of the output side when the power supply is in parallel operation;
the first end of the overcurrent protection circuit is connected with the input positive end, and the second end of the overcurrent protection circuit is connected with the first end of the input positive end anti-reflection circuit; the EMI protection circuit is arranged between the second end of the overcurrent protection circuit and the second end of the input positive end anti-reflection circuit;
the second end of the on-off control circuit is connected with the second end of the negative input end anti-reverse circuit, the first end of the on-off control circuit is connected with the second end of the main energy storage circuit, and the third end of the on-off control circuit is connected with the control end of the main control circuit; the first end of the startup anti-surge circuit is connected with the first end of the startup control circuit, and the second end of the startup anti-surge circuit is connected with the second end of the main energy storage circuit;
the first end of the auxiliary circuit is respectively connected with the first end of the input positive end anti-reflection circuit and the first end of the main energy storage circuit, the second end of the auxiliary circuit is grounded, and the third end of the auxiliary circuit outputs auxiliary electric energy.
2. The direct-in direct-out power supply circuit according to claim 1, wherein the input anti-reflection circuit comprises: the input positive end anti-reflection circuit, the first control circuit and the input negative end anti-reflection circuit;
the second end of the input positive end anti-reflection circuit is connected with the input positive end, the first end of the input positive end anti-reflection circuit is connected with the first end of the main energy storage circuit, the third end of the input positive end anti-reflection circuit is connected with the control end of the first control circuit, the first detection end of the first control circuit is connected with the second end of the input positive end anti-reflection circuit and is connected to the input positive end, and the second detection end of the first control circuit is connected with the first end of the main energy storage circuit;
the first end of the input negative end anti-reflection circuit is connected with the input negative end, the second end of the input negative end anti-reflection circuit is connected with the second end of the main energy storage circuit, and the third end of the input negative end anti-reflection circuit is connected with the input negative end anti-reflection control circuit.
3. The direct-in and direct-out power supply circuit according to claim 2, wherein the input positive-end anti-reflection circuit comprises a first MOS tube, the first control circuit comprises a first control IC, and the input end anti-reflection circuit comprises a fourth MOS tube;
the second end of the first MOS tube is connected with the input positive end, the first end of the first MOS tube is connected with the first end of the main energy storage circuit, the third end of the first MOS tube is connected with the control end of the first control IC, the first detection end of the first control IC is connected with the second end of the first MOS tube and is connected with the input positive end, and the second detection end of the first control IC is connected with the first end of the main energy storage circuit;
the first end of the fourth MOS tube is connected with the input negative end, the second end of the fourth MOS tube is connected with the second end of the main energy storage circuit, and the third end of the fourth MOS tube is connected with the input negative end anti-reverse control circuit.
4. The direct-in direct-out power supply circuit according to claim 1, wherein the output anti-reflection circuit includes: the output positive end anti-reflection circuit, the second control circuit and the output negative end anti-reflection circuit;
the second end of the output positive end anti-reflection circuit is connected with the first end of the main energy storage circuit, the first end of the output positive end anti-reflection circuit is connected with the output positive end, the third end of the output positive end anti-reflection circuit is connected with the control end of the second control circuit, the first detection end of the second control circuit is connected with the second end of the output positive end anti-reflection circuit and is connected with the first end of the main energy storage circuit, and the second detection end of the second control circuit is connected with the output positive end;
the first end of the output negative end anti-reflection circuit is connected with the second end of the main energy storage circuit, the second end of the output negative end anti-reflection circuit is connected with the output negative end, and the third end of the output negative end anti-reflection circuit is connected with the output negative end anti-reflection control circuit.
5. The direct-in and direct-out power supply circuit according to claim 4, wherein the output positive-end anti-reflection circuit comprises a second MOS tube, the second control circuit comprises a second control IC, and the output negative-end anti-reflection circuit comprises a sixth MOS tube;
the second end of the second MOS tube is connected with the first end of the main energy storage circuit, the first end of the second MOS tube is connected with the output positive end, the third end of the second MOS tube is connected with the control end of the second control IC, the first detection end of the second control IC is connected with the second end of the output positive end anti-reflection circuit and is connected with the first end of the main energy storage circuit, and the second detection end of the second control IC is connected with the output positive end;
the first end of the sixth MOS tube is connected with the second end of the main energy storage circuit, the second end of the sixth MOS tube is connected with the output negative end, and the third end of the sixth MOS tube is connected with the output negative end anti-reverse control circuit.
6. The direct-in and direct-out power supply circuit according to claim 1, wherein the on-off control circuit comprises a fifth MOS transistor;
the second end of the fifth MOS tube is connected with the second end of the negative input end anti-reflection circuit, the first end of the fifth MOS tube is connected with the second end of the main energy storage circuit, and the third end of the fifth MOS tube is connected with the control end of the main control circuit.
7. The in-out power supply circuit according to claim 1, wherein the auxiliary circuit includes: the first diode, auxiliary anti-surge circuit and auxiliary energy storage circuit;
the positive pole of first diode is connected the input positive end prevents the first end of reverse circuit with the first end of main tank circuit, the first end of supplementary surge protection circuit is connected the negative pole of first diode, the second end of supplementary surge protection circuit is connected the positive end of supplementary tank circuit, the second ground connection of supplementary tank circuit, the second end of supplementary surge protection circuit and the positive end of auxiliary tank circuit of quivering are regarded as the third end output auxiliary electric energy of auxiliary circuit.
8. The in-out power supply circuit according to claim 1, further comprising: the EMI protection circuit includes: the first filter capacitor, the second filter capacitor and the common mode inductor;
the first end of the first filter capacitor is connected with the first end of the overcurrent protection circuit, the second end of the first filter capacitor is connected with the first end of the second filter capacitor, the second end of the second filter capacitor is connected with the negative input end, and the second end of the first filter capacitor and the first end of the second filter capacitor are also connected to ground;
the fourth end of the common-mode inductor is connected with the second end of the overcurrent protection circuit, the first end of the common-mode inductor is connected with the second end of the input positive-end anti-reflection circuit, the third end of the common-mode inductor is connected with the input negative end, and the second end of the common-mode inductor is connected with the first end of the input negative-end anti-reflection circuit.
9. A power supply comprising a direct in-direct out power supply circuit according to any one of claims 1-8.
CN201910565588.8A 2019-06-27 2019-06-27 Power supply circuit and power supply with direct-in and direct-out function Active CN110289608B (en)

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CN201910565588.8A CN110289608B (en) 2019-06-27 2019-06-27 Power supply circuit and power supply with direct-in and direct-out function

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Application Number Priority Date Filing Date Title
CN201910565588.8A CN110289608B (en) 2019-06-27 2019-06-27 Power supply circuit and power supply with direct-in and direct-out function

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CN110289608B true CN110289608B (en) 2024-03-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104242249A (en) * 2014-09-17 2014-12-24 广州金升阳科技有限公司 Protective circuit of switching power supply
CN108512191A (en) * 2017-02-27 2018-09-07 中兴通讯股份有限公司 The carrying out surge protection method of surge protection circuit, electronic equipment and circuit
CN109245082A (en) * 2018-10-16 2019-01-18 大连海事大学 Two-way switch circuit that is a kind of anti-reverse and inhibiting power-on surge current
CN209963755U (en) * 2019-06-27 2020-01-17 深圳欧陆通电子股份有限公司 Direct-in and direct-out power supply circuit and power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104242249A (en) * 2014-09-17 2014-12-24 广州金升阳科技有限公司 Protective circuit of switching power supply
CN108512191A (en) * 2017-02-27 2018-09-07 中兴通讯股份有限公司 The carrying out surge protection method of surge protection circuit, electronic equipment and circuit
CN109245082A (en) * 2018-10-16 2019-01-18 大连海事大学 Two-way switch circuit that is a kind of anti-reverse and inhibiting power-on surge current
CN209963755U (en) * 2019-06-27 2020-01-17 深圳欧陆通电子股份有限公司 Direct-in and direct-out power supply circuit and power supply

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