CN216851756U - Switching power supply with adjustable buck-boost - Google Patents
Switching power supply with adjustable buck-boost Download PDFInfo
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- CN216851756U CN216851756U CN202123376469.XU CN202123376469U CN216851756U CN 216851756 U CN216851756 U CN 216851756U CN 202123376469 U CN202123376469 U CN 202123376469U CN 216851756 U CN216851756 U CN 216851756U
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Abstract
The utility model discloses a switching power supply with adjustable buck-boost, include: the auxiliary power supply circuit is connected to the input end of the switching power supply and is used for converting input voltage into working voltage for other circuits to work; the output voltage regulating circuit is connected to the output end of the switching power supply and is used for regulating the output voltage of the switching power supply; and the Buck-Boost main power circuit is connected to the input end of the switching power supply and is used for regulating the input voltage of the switching power supply. Compared with the prior art, the utility model discloses can carry out the Buck-Boost transform to input voltage through Buck-Boost main power circuit, have the input voltage scope of broad, use the scene extensively to can change output voltage's size through output voltage regulating circuit, improve the utilization ratio of power.
Description
Technical Field
The utility model relates to a switching power supply, especially a buck-boost adjustable switching power supply.
Background
In recent years, with the progress of science and technology and the development of society, people's lives are more and more colorful, and more electronic products are applied to real life. However, the required power supply voltage is different for different electronic products, so that the complicated electronic equipment and the power supply requirements of various voltage levels make people tired to deal with the power supply voltage. The current power supply equipment with single output voltage cannot meet the current requirements of people on different voltages, and the power supply equipment with variable output voltage and universality gradually becomes an object pursued by people.
The universal power supply equipment has certain adaptability to input voltage when meeting the requirement of adjustable output voltage, and a single boosting circuit or a single voltage reduction circuit has larger limitation; in order to have a stronger adaptability, the power supply needs to implement not only the step-up conversion but also the step-down conversion of the input voltage. The Flyback converter can realize boost conversion and buck conversion of input voltage theoretically, but the topology has a plurality of larger defects, firstly, the Flyback converter has certain requirements on power and is mainly suitable for circuits with lower power level; secondly, the transmission efficiency of a Flyback topological structure is low due to the existence of the leakage inductance of the transformer; moreover, when the turn ratio of the transformer is determined, only one conversion of boosting or reducing can be generally realized, because the other conversion can cause the duty ratio to exceed 50%, the system can be unstable without adding a slope compensation circuit, and the cost is obviously increased by adding the slope compensation circuit. The Buck-Boost circuit is simple in structure, integrates the advantages of the Buck and Boost circuits, can achieve Boost conversion and Buck conversion, and has high energy transmission efficiency.
Therefore, how to design a switching power supply with adjustable buck-boost, which can meet the requirements of users on different voltages, is a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
To among the prior art, the single power supply unit of output voltage can't satisfy the problem of user to different voltage demands, the utility model provides a buck-boost adjustable switching power supply.
The technical scheme of the utility model for, a buck-boost adjustable switching power supply is proposed, it includes: the auxiliary power supply circuit is connected to the input end of the switching power supply and is used for converting input voltage into working voltage for other circuits to work;
the output voltage regulating circuit is connected to the output end of the switching power supply and is used for regulating the output voltage of the switching power supply;
and the Buck-Boost main power circuit is connected to the input end of the switching power supply and is used for regulating the input voltage of the switching power supply.
Further, still include:
the input protection circuit is arranged at the input end of the switching power supply and used for realizing reverse connection protection, input overcurrent protection and input overvoltage protection of the switching power supply, and the output end of the output protection circuit is respectively connected with the auxiliary power supply circuit and the Buck-Boost main power circuit;
and the overvoltage and overcurrent protection circuit is arranged at the output end of the switching power supply and is used for performing overvoltage or overcurrent protection on the switching power supply.
Further, the auxiliary power circuit includes a transformer T1, a primary winding W1 wound on the primary side of the transformer T1, a first secondary winding W2 wound on the secondary side of the transformer T1, and a second secondary winding W3; the primary winding W1 is connected to the output end of the input protection circuit and is configured to receive an input voltage, the first secondary winding W2 converts the input voltage into a first working voltage after passing through a transformer T1, and the second secondary winding W3 converts the input voltage into a second working voltage after passing through a transformer T2.
Further, the output voltage regulating circuit includes: a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, an amplifier U1B, a capacitor C6, a capacitor C7 and a toggle switch SW1-DIP 8;
the dial switch SW1-DIP8 has 4 switches arranged in parallel, the resistor R16, the resistor R17, the resistor R18 and the resistor R19 are respectively connected in series with 4 switches of the dial switch SW1-DIP8, one end of the dial switch SW1-DIP8 is connected to a 5V power supply, the other end of the dial switch SW1-DIP8 is connected to one end of the resistor R15 after being connected in series with the resistor R16, the resistor R17, the resistor R18 and the resistor R19 through 4 switches arranged in parallel, the other end of the resistor R15 is grounded, one end of the resistor R14 is connected between the resistor R15 and the resistor R19, the other end of the resistor R14 is connected to the non-inverting input end of the amplifier U1B, the inverting input end of the amplifier U1B is connected in series with the resistor R6 and then connected to the output end of the switch power supply, the output end of the output terminal of the output voltage adjusting circuit is used for outputting different voltage signals, one end of the capacitor C6 is connected to the output terminal of the amplifier U1B, The other end of the capacitor C7 is connected in parallel to the two ends of the resistor R5 after being connected in series with a resistor R12 to be connected to the inverting input end of the amplifier U1B.
The Buck-Boost main power circuit, the control circuit, the output voltage regulating circuit and the overvoltage and overcurrent protection circuit jointly regulate the input voltage of the switching power supply.
Further, the input protection circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a comparator U1A, a triode Q1, a diode D1, a diode D2, a relay RY1 and a fuse F1;
the anode of the diode D1 is connected to the input end of the switching power supply in series with the fuse F1, the cathode of the diode D1 is connected to the controlled end of the relay RY1 in series and then is connected to the input end of the switching power supply as the output end of the input protection circuit, one end of the resistor R1 is connected between the input end of the switching power supply and the fuse F1, the other end of the resistor R1 is connected to the ground after being connected to the resistor R2 and the resistor R3 in series, one end of the resistor R4 is connected to the 5V power supply, the other end of the resistor R5 is connected to the ground after being connected to the 5V power supply, the non-inverting input end of the comparator U1A is connected between the resistor R2 and the resistor R3, the inverting input end of the comparator R4 and the resistor R5, the output end of the resistor R6 is connected to the base of the triode Q1, the emitter of the triode Q1 is connected to the ground, and the collector of the control end of the relay RY1, the other end of the control end of the relay RY1 is connected with a 15V power supply, and the diode D2 is connected in parallel with the two ends of the control end of the relay RY 1.
Further, the overvoltage and overcurrent protection circuit comprises: the circuit comprises a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a comparator U1C, a comparator U1D AND an AND gate 2;
one end of the resistor R20 is connected with a 5V power supply, the other end of the resistor R20 is connected with the resistor R21 AND the resistor R22 in series AND then is grounded, the non-inverting input end of the comparator U1C is connected between the resistor R20 AND the resistor R21, the inverting input end of the comparator U1C is connected with the output voltage of the switching power supply, the output end of the comparator U1 23 is connected with the first input end of the AND gate AND2, the non-inverting input end of the comparator U1D is connected between the resistor R21 AND the resistor R22, the inverting input end of the comparator U1 is connected with the output current of the switching power supply, the output end of the resistor R24 is connected with the second input end of the AND gate AND2, AND the output end of the AND gate AND2 is used as the output end of the overvoltage AND overcurrent protection circuit for outputting protection signals.
Further, the first operating voltage is 15V, and the second operating voltage is 5V.
Further, the output voltage of the switching power supply rises as the number of switches closed in the dial switch increases.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1. the Buck-Boost main power circuit can realize the Buck-Boost conversion of input voltage, so that the utility model has a wider input voltage range and a wide application scene;
2. the input protection circuit can realize reverse connection protection, input overcurrent protection and input overvoltage protection, so that the utility model has higher safety;
3. the output voltage can be adjusted in real time through the output voltage adjusting circuit, and the utilization rate of the switching power supply is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic diagram of the overall circuit architecture of the present invention;
FIG. 2 is a schematic diagram of the connection of the input protection circuit;
FIG. 3 is a schematic diagram of the connection of the auxiliary power circuit;
FIG. 4 is a schematic connection diagram of a Buck-Boost main power circuit;
FIG. 5 is a schematic diagram of the connection of the output voltage regulating circuit;
fig. 6 is a schematic connection diagram of the overvoltage and overcurrent protection circuit.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and examples.
The universal power supply equipment not only needs to meet the requirement that the output voltage is adjustable, but also needs to have certain adaptability to the input voltage, and a single booster circuit or a single buck circuit has great limitation. The utility model discloses an thinking lies in, provides a Buck-Boost adjustable switching power supply, and it has Buck-Boost main power circuit and output voltage regulating circuit, makes it can adjust input voltage and output voltage to satisfy switching power supply to input voltage and output voltage's demand.
Specifically, the utility model provides a switching power supply is at least including:
an auxiliary power supply circuit: the switching power supply is connected with the input end of the switching power supply and is used for converting input voltage into working voltage for other circuits to work;
the output voltage regulating circuit is connected to the output end of the switching power supply and is used for regulating the output voltage of the switching power supply;
and the Buck-Boost main power circuit is connected to the output end of the switching power supply and is used for adjusting the input voltage of the switching power supply.
The during operation, the utility model discloses can supply power to each circuit through auxiliary power supply circuit, then adjust input voltage and output voltage through output voltage regulating circuit and Buck-Boost main power circuit to satisfy switching power supply to the demand of different voltages.
Further, for improving the holistic security of switching power supply, the utility model discloses still be equipped with:
the input protection circuit is arranged at the input end of the switching power supply and used for realizing reverse connection protection, input overcurrent protection and input overvoltage protection of the switching power supply, and the auxiliary power supply circuit and the Buck-Buck main power circuit are connected to the output end of the input protection circuit and used for receiving input voltage;
and the overvoltage and overcurrent protection circuit is arranged at the output end of the switching power supply and is used for detecting the output voltage and the output current of the switching power supply and carrying out overvoltage or overcurrent protection on the output of the switching power supply.
Specifically, referring to fig. 1, the input protection circuit is disposed at an input end of the switching power supply, and receives an externally input voltage VDC, and performs input overcurrent protection and input overvoltage protection on the externally input voltage VDC, the output voltage VIN of the input protection circuit serves as an input voltage of the whole circuit, the Buck-Boost DC/DC Buck converter includes a Buck-Boost main power circuit and an output voltage regulating circuit, which are used for regulating the input voltage and the output voltage, and are connected to an output end of the input protection circuit, and are used for receiving the input voltage VIN and performing Buck-Boost processing, the overvoltage/overcurrent protection circuit is disposed at an output end of the switching power supply, and is used for sampling the output voltage and the input voltage and outputting overvoltage protection and output overcurrent protection, and a protection signal output by the overvoltage/overcurrent protection circuit is fed back to the Buck-Boost DC/DC Buck converter after passing through a control loop formed by a control chip UC3843, and a closed-loop control loop is formed for regulating the input voltage, the auxiliary power supply circuit is a Flyback auxiliary power supply circuit, is connected to the output end of the input protection circuit, receives the input voltage Vin, and converts the input voltage Vin into output voltages of 5V and 15V for the control chip UC3843 to use.
Further, referring to fig. 2, the input protection circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a comparator U1A, a triode Q1, a diode D1, a diode D2, a relay RY1 and a fuse F1;
wherein, the anode of the diode D1 is connected in series with the fuse F1 and then connected to the input end of the switch power supply, the cathode is connected in series with the controlled end of the relay RY1 and then connected as the output end of the input protection circuit with the input ends of the Buck-Boost main power circuit and the auxiliary power circuit, one end of the resistor R1 is connected between the input end of the switch power supply and the fuse F1, the other end is connected in series with the resistor R2 and the resistor R3 in sequence and then grounded, one end of the resistor R4 is connected with the 5V power supply, the other end of the comparator U1A is connected with a resistor R5 in series and then grounded, the non-inverting input end of the comparator U1 is connected between a resistor R2 and a resistor R3, the inverting input end of the comparator U1 is connected between a resistor R4 and a resistor R5, the output end of the comparator U1 is connected with a resistor R6 in series and then connected with the base electrode of a triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of the control end of a relay RY1, the other end of the control end of the relay RY1 is connected with a 15V power supply, and a diode D2 is connected with two ends of the control end of a relay RY1 in parallel.
The working principle is as follows: an input voltage VDC is divided by a resistor R1, a resistor R2 and a resistor R3 and then is input to a non-inverting input end of a comparator U1A, a voltage dividing reference voltage is obtained by a 5V power supply through a resistor R4 and a resistor R5 at an inverting input end of the comparator U1A, when the input voltage VDC is normal, the voltage output to the non-inverting input end of the comparator U1A after voltage dividing is lower than the voltage reference at the inverting input end, at the moment, the comparator UiA outputs a low-level signal, a triode Q1 works in an off state, a relay RY1 is a normally closed relay, a control end of the relay RY is not electrified, a controlled end of the relay RY is in a closed state, and the input voltage VDC is output after passing through a fuse F1 and a diode D1;
when the input voltage is overvoltage, the voltage which is output to the non-inverting input end of the comparator U1A after being divided is higher than the reference voltage of the inverting input end, the output end of the comparator U1A outputs a high-level signal, the triode Q1 is conducted, the control end of the normally closed relay RY1 is electrified and controls the controlled end to be disconnected, the input voltage VDC cannot be output through the diode D1, and therefore input overvoltage protection is achieved;
the diode D1 is an anti-reverse diode, and by utilizing the characteristic that the diode is reversely cut off, when the circuit is reversely connected, the input voltage VDC cannot be transmitted from the cathode to the anode of the diode D1, the circuit stops working, and the anti-reverse effect is further achieved;
the fuse F1 is a fusible fuse, and when the input current is over-current, the fuse F1 has high heat and can be fused, so that the circuit stops working, and the input over-current protection is realized.
Referring to fig. 3, the auxiliary power circuit includes a transformer T1, a primary winding W1 wound on a primary side of the transformer T1, a first secondary winding W2 wound on a secondary side of the transformer T2, and a second secondary winding W3 wound on a secondary side of the transformer T2, where the primary winding W1 is connected to an output end of the input protection circuit and is configured to receive an input voltage VIN, the first secondary winding W2 is configured to convert the input voltage into a first working voltage, the first working voltage is 15V, the second secondary winding W3 is configured to convert the input voltage into a second working voltage, and the second working voltage is 5V, and voltages of 15V and 5V are respectively used to control the chip UC3843 and the operational amplifier chip LM324 to supply power.
A switching tube Q2 is also connected to the primary winding W1, and can be used to adjust the operating state of the auxiliary power supply circuit. The first secondary winding W2 and the second secondary winding W3 are wound together to form a secondary winding with a center tap end, the first end of the secondary winding outputs a first working voltage, the second end of the secondary winding outputs a second working voltage, the center tap end is grounded, a capacitor C2 is connected between the first end and the ground, and a capacitor C4 is connected between the second end and the ground and used for filtering out common mode interference in a circuit.
Further, referring to fig. 4, the Buck-Boost main power circuit, the overvoltage and overcurrent protection circuit, the control circuit 1, and the output voltage regulating circuit together form a closed-loop control circuit, the overvoltage and overcurrent protection circuit is configured to collect an output voltage and an output voltage of the Buck-Boost main power circuit, and output a sampling result to the control circuit 1, the control circuit 1 is a control circuit formed by a control chip UC3843, and is connected to the output voltage regulating circuit and outputs a voltage regulating signal to the control circuit 1, an output of the control circuit 1 and a protection signal P2 output by the overvoltage and overcurrent protection circuit are output to the switching tube Q3 together, so as to regulate a switching state of the switching tube Q3, and further regulate a working state of the switching power supply.
Referring to fig. 5, the output voltage regulating circuit includes: a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, an amplifier U1B, a capacitor C6, a capacitor C7 and a dial switch SW1-DIP 8;
wherein, the dial switch SW1-DIP8 is provided with 4 switches which are arranged in parallel, a resistor R16, a resistor R17, a resistor R18 and a resistor R19 are respectively connected with 4 switches of the dial switch SW1-DIP8 in series, one end of the dial switch SW1-DIP8 is connected with a 5V power supply, the other end of the dial switch SW1-DIP8 is connected with one end of a resistor R16, a resistor R17, a resistor R18 and a resistor R19 which are arranged in parallel through the 4 switches which are arranged in series and then connected with one end of a resistor R15, the other end of the resistor R15 is grounded, one end of the resistor R14 is connected between the resistor R15 and the resistor R19, the other end of the resistor R6324 is connected with a non-inverting input end of the amplifier U1B, an inverting input end of the amplifier U1B is connected with the resistor R13 in series and then connected with an output end of the switch power supply, an output end of the output end as an output voltage adjusting circuit of the output voltage, an output end of the output voltage adjusting circuit is used for outputting different voltage signals, one end of the capacitor C6 is connected with the output end of the amplifier U1B, the other end of the amplifier U1 12 is connected with the inverting input end of the amplifier U1B, the capacitor C7 is connected in parallel across the resistor R5.
The working principle of the amplifier is that the resistances of a resistor R16, a resistor R17, a resistor R18 and a resistor R19 which are connected with a dial switch SW1-DIP8 are sequentially increased, when 4 paths of switches of the dial switch SW1-DIP8 are not toggled and are in an off state, the voltage output by a 5V power supply cannot be output to the non-inverting input end of an amplifier U1B through the dial switch SW1-DIP8, the voltage of the non-inverting input end is 0, and the output of an output voltage adjusting circuit is zero at the moment;
when one of the dial switches SW1-DIP8 is dialed down, the voltage output by the 5V power supply can be output to the non-inverting input end of the amplifier U1B through the circuit, so that the circuit outputs a voltage, the voltage output to the non-inverting input end of the amplifier U1B is the voltage obtained by dividing the voltage of the resistance of the next path by the resistance R15, for example, when the switches SW1-DIP8 are dialed down, the resistance R19 is connected to the circuit, the voltage output to the non-inverting input end of the amplifier U1B is the voltage obtained by dividing the voltage of the resistance R15 by the resistance R19, and the voltage is 5
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When two paths of the dial switches SW1-DIP8 are dialed down, the resistors at the dial switches are connected in parallel to reduce the resistance value, the voltage received by the non-inverting input end of the amplifier U1B is increased, and the output voltage is increased; when three paths of the dial switches SW1-DIP8 are dialed down, the voltage of the non-inverting input end of the operational amplifier U1B is further increased; when all the switches in the dial switches SW1-DIP8 are dialed down, the resistor R15, the resistor R17, the resistor R18 and the resistor R19 are all connected to the circuit, and the voltage at the non-inverting input terminal of the operational amplifier U1B is:
in this case, the output voltage reaches the maximum value. The utility model discloses can be through the number of dialling the switch in the regulation dial-up switch and the voltage that the switch regulation amplifier U1B inphase input end that specifically dials down received, and then the output voltage of regulating switch power supply to this realization is to defeatedAnd in the step-up and step-down conversion of the output voltage, the more the number of closed switches in the dial switch is, the higher the output voltage is.
Referring to fig. 6, the over-voltage and over-current protection circuit includes: the circuit comprises a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a comparator U1C, a comparator U1D AND an AND gate 2;
one end of the resistor R20 is connected with a 5V power supply, the other end of the resistor R20 is sequentially connected with the resistor R21 AND the resistor R22 in series AND then grounded, the non-inverting input end of the comparator U1C is connected between the resistor R20 AND the resistor R21, the inverting input end of the comparator U1C is connected with the output voltage of the switching power supply, the output end of the comparator U1 23 is connected with the first input end of the AND gate AND2 after being connected with the resistor R21 AND the resistor R22, the inverting input end of the comparator U1D is connected with the output current of the switching power supply, the output end of the comparator U24 is connected with the second input end of the AND gate AND2 after being connected with the resistor R24, AND the output end of the AND gate AND2 serves as the output end of the overvoltage AND overcurrent protection circuit AND is used for outputting a protection signal.
The working principle of the voltage divider is that a 5V power supply is divided by a resistor R20, a resistor R21 and a resistor R22, a first reference voltage is generated between a resistor R20 and a resistor R21, a second reference voltage is generated between a resistor R21 and a resistor R22, a non-inverting input end of a comparator U1C is connected between the resistor R20 and the resistor R21 to obtain the first reference voltage, an inverting input end of the comparator U1C is connected to a sampled output voltage, when the output of the switching power supply has an overvoltage fault, the output voltage connected to the inverting input end is higher than the first reference voltage of the non-inverting input end, the comparator U1C outputs a low-level signal, when the output of the switching power supply is normal, the output voltage connected to the inverting input end is lower than the first reference voltage of the non-inverting input end, and the comparator U1C outputs a high-level signal;
the non-inverting input end of the comparator U1D is connected between the resistor R21 and the resistor R22 to obtain a second reference voltage, the inverting input end is connected to output current, when the output of the switching power supply has an overcurrent fault, the voltage of the inverting input end of the comparator U1D is higher than the second reference voltage of the non-inverting input end, and the comparator U1D outputs a low-level signal; when the output of the switching power supply is normal, the voltage of the inverting input end is lower than the second reference voltage of the non-inverting input end, and the comparator U1D outputs a high-level signal;
the output terminals of the comparator U1C AND the comparator U1D are respectively connected to the first input terminal AND the second input terminal of the AND gate AND2, because the calculation formula of the AND gate is (AB), the output terminal outputs a high level signal only when the first input terminal AND the second input terminal output high level signals at the same time, when the comparator U1C outputs a high level signal, it indicates that the output voltage of the switching power supply is normal, when the comparator U1D outputs a high level signal, it indicates that the output current of the switching power supply is normal, that is, only when the output voltage AND the output current of the switching power supply are normal, the AND gate AND2 outputs a high level signal, when at least one of overvoltage AND overcurrent exists in the switching power supply, the AND gate AND2 outputs a low level signal, AND the switching power supply can perform overvoltage AND overcurrent protection according to the high AND low level of the protection signal P2 output by the AND gate 2.
In other embodiments of the present invention, the design of the OR gate OR may also be adopted, the comparator U1C and the inverting input terminal of the comparator U1D are connected to the resistor R20 and the resistor R21, and the resistor R21 and the resistor R22 to obtain the reference voltage, then the output terminals of the comparator U1C and the comparator U1D are respectively connected to the first input terminal and the second input terminal of the OR gate OR, when the output of the switching power supply has the overvoltage fault, the comparator U1C outputs the high level signal, when the output of the switching power supply has the overcurrent fault, the comparator U1D outputs the high level signal, because the calculation formula of the OR gate OR is (a + B), as long as one of the first input terminal and the second input terminal is the high point level, the output terminal of the switching power supply outputs the high level signal as long as one of the overvoltage fault and the overcurrent fault occurs, OR the gate OR outputs the high level signal, the switching power supply can judge whether the circuit has faults according to a high level signal output by the OR gate OR, so that overvoltage and overcurrent protection is performed.
Specifically, referring to fig. 4, a switching tube Q3 is connected in series in the Buck-Boost main power circuit, a control signal output by the control loop 1 AND a protection signal P2 output by the overvoltage AND overcurrent protection circuit are respectively output to a first input end AND a second input end of an AND gate AND1, AND an output end of the AND gate AND1 is connected to a gate of the switching tube Q3 for controlling an on-off state thereof. When the switching power supply has overvoltage or overcurrent faults, the AND gate AND2 in the overvoltage AND overcurrent protection circuit outputs a low-level signal, AND under the condition, no matter the control loop 1 outputs a high-level signal or a low-level signal, the AND gate AND1 outputs a low-level signal to the gate of the switching tube Q3, so that the switching tube Q3 is disconnected, AND because the switching tube Q3 is connected in series in the Bcuk-Boost main power circuit, when the switching tube Q3 is disconnected, the circuit stops working, AND a protection effect is achieved.
A capacitor C5 is connected in parallel to the Bcuk-Boost main power circuit and used for filtering differential mode interference in the circuit, a resistor R10 and a resistor R11 are connected between an output positive end and an output negative end of the Bcuk-Boost main power circuit, one input end of the overvoltage and overcurrent protection circuit is connected between the resistor R10 and the resistor R11 and used for collecting output voltage, and the other input end of the overvoltage and overcurrent protection circuit is connected to the output negative end and used for collecting output current so as to detect overvoltage and overcurrent protection circuit of a user.
The utility model discloses holistic working process does, and direct current voltage VDC is at first through input protection circuit, and this circuit is used for playing functions such as reversal protection, input overcurrent protection and input overvoltage protection, and when direct current voltage VDC was too high, normally closed relay RY 1's control end was gone up the electricity, and the controlled end disconnection makes the disconnection of input protection circuit, realizes the protection to follow-up circuit. When the circuit is normal, the voltage VIN output by the input protection circuit is used as the input voltage of an auxiliary power circuit and a Bcuk-Boost main power circuit, the auxiliary power circuit is used for generating working voltage of 15V and 5V and is used for controlling a control chip UC3843 and an operational amplifier chip LM324 in the circuit and supplying power to other circuits; the Buck-Boost main power circuit realizes the boosting and voltage reduction change of input voltage under the common control of a control loop, an output voltage regulating circuit and an overvoltage and overcurrent protection circuit, which are formed by a control chip UC3843, and the output voltage of the switching power supply is controlled by the output voltage regulating circuit.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1. the Buck-Boost main power circuit is arranged, so that the input voltage of the switching power supply can be adjusted, the switching power supply has a wider input voltage range, and the application scene is wide;
2. through the arrangement of the input protection circuit, the switching power supply has reverse connection protection, input overcurrent protection and input overvoltage protection; through the arrangement of the overvoltage and overcurrent protection circuit, the open-tube power supply has output overcurrent protection and output overvoltage protection; the switching power supply has higher safety;
3. through the arrangement of the output voltage regulating circuit, the output voltage can be regulated by regulating the number of the dial switches SW1-DIP8, and the utilization rate of the switching power supply is improved.
The above examples are only for illustrating the specific embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several modifications and changes can be made, and all such modifications and changes are intended to fall within the scope of the present invention.
Claims (9)
1. The utility model provides a buck-boost adjustable switching power supply which characterized in that includes:
the auxiliary power supply circuit is connected to the input end of the switching power supply and is used for converting input voltage into working voltage for other circuits to work;
the output voltage regulating circuit is connected to the output end of the switching power supply and is used for regulating the output voltage of the switching power supply;
and the Buck-Boost main power circuit is connected to the input end of the switching power supply and is used for regulating the input voltage of the switching power supply.
2. The switching power supply according to claim 1, further comprising:
the input protection circuit is arranged at the input end of the switching power supply and used for realizing reverse connection protection, input overcurrent protection and input overvoltage protection of the switching power supply, and the output end of the output protection circuit is respectively connected with the auxiliary power supply circuit and the Buck-Boost main power circuit;
and the overvoltage and overcurrent protection circuit is arranged at the output end of the switching power supply and is used for performing overvoltage or overcurrent protection on the switching power supply.
3. The switching power supply according to claim 2, wherein the auxiliary power supply circuit comprises a transformer T1, a primary winding W1 wound on the primary side of the transformer T1, a first secondary winding W2 wound on the secondary side of the transformer T1, and a second secondary winding W3;
the primary winding W1 is connected to the output end of the input protection circuit and is configured to receive an input voltage, the first secondary winding W2 converts the input voltage into a first working voltage after passing through a transformer T1, and the second secondary winding W3 converts the input voltage into a second working voltage after passing through a transformer T2.
4. The switching power supply according to claim 1, wherein the output voltage regulating circuit comprises: a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, an amplifier U1B, a capacitor C6, a capacitor C7 and a toggle switch SW1-DIP 8;
the dial switch SW1-DIP8 has 4 switches arranged in parallel, the resistor R16, the resistor R17, the resistor R18 and the resistor R19 are respectively connected in series with 4 switches of the dial switch SW1-DIP8, one end of the dial switch SW1-DIP8 is connected to a 5V power supply, the other end of the dial switch SW1-DIP8 is connected in series with the resistor R16, the resistor R17, the resistor R18 and the resistor R19 through 4 switches arranged in parallel, the other end of the resistor R15 is grounded, one end of the resistor R14 is connected between the resistor R15 and the resistor R19, the other end of the resistor R14 is connected to the non-inverting input end of the amplifier U1B, the inverting input end of the amplifier U1B is connected in series with the resistor R6 and then connected to the output end of the switch power supply, the output end of the capacitor C6 is connected to the output end of the amplifier U B, The other end of the capacitor C7 is connected in parallel to the two ends of the resistor R5 after being connected in series with a resistor R12 to be connected to the inverting input end of the amplifier U1B.
5. The switching power supply according to claim 2, further comprising a control loop composed of a control chip UC3843, wherein the Buck-Boost main power circuit regulates the input voltage of the switching power supply together with the control loop, the output voltage regulating circuit, and the over-voltage and over-current protection circuit.
6. The switching power supply according to claim 2, wherein the input protection circuit comprises: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a comparator U1A, a triode Q1, a diode D1, a diode D2, a relay RY1 and a fuse F1;
the anode of the diode D1 is connected in series with a fuse F1 and then connected to the input end of the switching power supply, the cathode of the diode D1 is connected in series with the controlled end of the relay RY1 and then connected as the output end of the input protection circuit, one end of the resistor R1 is connected between the input end of the switching power supply and the fuse F1, the other end of the resistor R1 is connected in series with the resistor R2 and the resistor R3 in sequence and then grounded, one end of the resistor R4 is connected with a 5V power supply, the other end of the resistor R4 is connected in series with the resistor R5 and then grounded, the non-inverting input end of the comparator U1A is connected between the resistor R2 and the resistor R3, the inverting input end of the comparator U3632 is connected between the resistor R4 and the resistor R5, the output end of the resistor R6 is connected in series and then connected to the base of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the control end of the relay RY1, the other end of the control end of the relay RY1 is connected with a 15V power supply, and the diode D2 is connected in parallel with two ends of the control end of the relay RY 1.
7. The switching power supply according to claim 2, wherein the overvoltage overcurrent protection circuit comprises: the circuit comprises a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a comparator U1C, a comparator U1D AND an AND gate 2;
one end of the resistor R20 is connected with a 5V power supply, the other end of the resistor R20 is sequentially connected with the resistor R21 AND the resistor R22 in series AND then grounded, the non-inverting input end of the comparator U1C is connected between the resistor R20 AND the resistor R21, the inverting input end of the comparator U1C is connected with the output voltage of the switching power supply, the output end of the comparator U1 23 is connected with the first input end of the AND gate AND2, the non-inverting input end of the comparator U1D is connected between the resistor R21 AND the resistor R22, the inverting input end of the comparator U1D is connected with the output current of the switching power supply, the output end of the resistor R24 is connected with the second input end of the AND gate AND2, AND the output end of the AND gate AND2 is used as the output end of the over-voltage AND over-current protection circuit for outputting a protection signal.
8. The switching power supply according to claim 3, wherein the first operating voltage is 15V and the second operating voltage is 5V.
9. The switching power supply according to claim 4, wherein the output voltage of the switching power supply increases as the number of switches closed in the dip switch increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123376469.XU CN216851756U (en) | 2021-12-30 | 2021-12-30 | Switching power supply with adjustable buck-boost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123376469.XU CN216851756U (en) | 2021-12-30 | 2021-12-30 | Switching power supply with adjustable buck-boost |
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| Publication Number | Publication Date |
|---|---|
| CN216851756U true CN216851756U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123376469.XU Active CN216851756U (en) | 2021-12-30 | 2021-12-30 | Switching power supply with adjustable buck-boost |
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| Country | Link |
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| CN (1) | CN216851756U (en) |
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2021
- 2021-12-30 CN CN202123376469.XU patent/CN216851756U/en active Active
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