CN215734027U - Switch power supply - Google Patents
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- CN215734027U CN215734027U CN202121866057.1U CN202121866057U CN215734027U CN 215734027 U CN215734027 U CN 215734027U CN 202121866057 U CN202121866057 U CN 202121866057U CN 215734027 U CN215734027 U CN 215734027U
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Abstract
The utility model discloses a switching power supply, comprising: the input end of the full-wave rectifying circuit is connected with the external alternating current end; the primary side input end of the conversion circuit is connected with the positive voltage output end of the full-wave rectification circuit, and the output end of the conversion circuit is connected with a load; the first input end of the switching circuit is connected with the primary side output end of the conversion circuit, and the output end of the switching circuit is connected with the negative voltage input end of the full-wave rectification circuit; the switch circuit at least comprises a switch chip with withstand voltage larger than a specified withstand voltage value, and is used for converting the direct-current voltage output by the full-wave rectification circuit into pulse voltage by controlling the on-off of the switch chip. The technical scheme effectively solves the problem that the input voltage range of the traditional switching power supply scheme is too small.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a switching power supply.
Background
In the electric energy industry, the power technology is always the hot direction of research, the most common traditional electric appliance is a linear power supply, and the linear power supply is a direct current voltage with micro-ripple voltage obtained by firstly reducing the voltage amplitude of alternating current through a transformer, rectifying the alternating current through a rectifying circuit to obtain pulse direct current and then filtering the pulse direct current. The traditional power grid linear power supply mostly uses an industrial frequency transformer, and has the design defects of large volume, small input voltage range, poor carrying capacity, no protection mechanism under abnormal conditions and difficulty in meeting the miniaturization requirement of an electric energy meter in order to meet the standard requirements of GB/T17215.211-2021 and GB/T17215.321-2021. In order to solve the problem, in recent years, a switching power supply is a popular research direction, the switching power supply is different from a linear power supply, a switching transistor used by the switching power supply is mostly switched between a fully-open mode (a saturation region) and a fully-closed mode (a cut-off region), and the two modes have the characteristic of low dissipation, and the switching power supply is widely applied to the field of power grids by combining the advantages of small size and light weight. However, the common switching power supply scheme input voltage range, 85-265VAC, does not meet the requirements in article 9.4.11 of the metering standard JJF 1245.1: if under the condition of nominal voltage of 220V, when the equipment is connected with 1.9 times of voltage, the equipment works for 4 hours without damage.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the present invention is to provide a switching power supply, which can expand the input voltage range under the condition of satisfying the national standards GB/T17215.211-2021 and GB/T17215.321-2021.
The technical scheme provided by the utility model is as follows:
the embodiment of the utility model provides a switching power supply, which comprises:
the input end of the full-wave rectifying circuit is connected with the external alternating current end;
the primary side input end of the conversion circuit is connected with the positive voltage output end of the full-wave rectification circuit, and the output end of the conversion circuit is connected with a load;
the first input end of the switching circuit is connected with the primary side output end of the conversion circuit, and the output end of the switching circuit is connected with the negative voltage input end of the full-wave rectification circuit; the switch circuit at least comprises a switch chip with withstand voltage larger than a specified withstand voltage value, and is used for converting the direct-current voltage output by the full-wave rectification circuit into pulse voltage by controlling the on-off of the switch chip.
Optionally, the power supply further comprises:
and the input end of the surge protection circuit is connected with the external alternating current end, and the output end of the surge protection circuit is connected with the input end of the full-wave rectification circuit.
Optionally, the power supply further comprises a common-mode inductor and a differential-mode interference rejection capacitor, wherein:
the positive input end of the common mode inductor is connected with the positive voltage output end of the full-wave rectification circuit, and the negative output end of the common mode inductor is connected with the negative voltage input end of the full-wave rectification circuit;
the differential mode interference suppression capacitor is connected between a positive voltage output end and a negative voltage input end of the full-wave rectification circuit.
Optionally, the power supply further comprises:
and a first end of the first filter circuit is connected with the positive output end of the common-mode inductor, and a second end of the first filter circuit is connected with the negative input end of the common-mode inductor.
Optionally, the first filter circuit comprises:
the voltage-sharing circuit at least comprises two resistors, the input end of the voltage-sharing circuit is connected with the positive output end of the common-mode inductor, and the output end of the voltage-sharing circuit is connected with the negative input end of the common-mode inductor;
the filter capacitors are connected in series to form a capacitor circuit, and the capacitor circuit is connected with the voltage-sharing circuit in parallel.
Optionally, the second specified withstand voltage value is 400 VAC.
Optionally, the conversion circuit includes: high frequency transformer, second filter circuit, CLC filter circuit and common mode interference rejection electric capacity, the load includes first load and second load, wherein:
the primary side input end of the high-frequency transformer is connected with the positive output end of the common-mode inductor, the primary side output end of the high-frequency transformer is connected with the first input end of the switch circuit, the secondary side of the first winding of the high-frequency transformer is connected with the input end of the second filter circuit, the secondary side of the second winding of the high-frequency transformer is connected with the input end of the CLC filter circuit, and the secondary side of the third winding of the high-frequency transformer is connected with the power supply end of the switch circuit;
the output end of the second filter circuit is connected with a first load;
the output end of the CLC filter circuit is connected with a second load;
a common mode interference rejection capacitance having a first end connected to a primary ground and a second end connected to a secondary ground.
Optionally, the power supply further comprises:
and the input end of the RCD absorption circuit is connected with the primary side output end of the conversion circuit, and the output end of the RCD absorption circuit is connected with the primary side input end of the conversion circuit.
Optionally, the power supply further comprises:
and the input end of the closed-loop voltage stabilizing circuit is connected with the secondary side of the second winding, the output end of the closed-loop voltage stabilizing circuit is connected with the ground, and the control end of the closed-loop voltage stabilizing circuit is connected with the voltage stabilizing end of the switch circuit.
Optionally, the switch chip is an 8235S chip.
The technical scheme provided by the utility model has the following technical effects:
the utility model provides a switching power supply, comprising: full-wave rectification circuit, switching circuit and switching circuit based on 8235S chip. The input voltage range can be effectively controlled to be 40-420VAC, thereby meeting wider applicable conditions. The full-wave rectifying circuit enables the power supply to work normally even if one phase or two phases are lost due to line faults under the condition of being applied to three-phase four-wire system multi-phase electricity. The switch circuit based on the 8235S chip enables the power supply to be small in size and light in weight, is convenient to apply to various compact devices, has the 8235S chip withstand voltage of 1200VAC, is internally provided with various protection measures, and improves the stability of the power supply. In addition, the stability of the power supply is further ensured by the surge protection circuit, the RCD absorption circuit, the closed-loop voltage stabilizing circuit, the common-mode inductor, the differential-mode interference suppression capacitor and the common-mode interference suppression capacitor. The CLC filter circuit greatly reduces the ripple of the output voltage and the output interference. The design of the element circuit is combined to ensure that the power supply normally works in the input voltage range of 40-420VAC on the premise of meeting the standards in GB/T17215.211-2021, GB/T17215.321-2021 and JJF 1245.1.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a switching power supply in an embodiment of the present invention;
fig. 2 shows a circuit diagram of a switching power supply in an embodiment of the utility model;
fig. 3 shows a circuit diagram of a surge protection circuit of a switching power supply in an embodiment of the present invention;
fig. 4 is a circuit diagram showing a full-wave rectification circuit of a switching power supply in an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a first filter circuit local amplification circuit of a switching power supply according to an embodiment of the present invention;
fig. 6 shows a circuit diagram of a first filter circuit of a switching power supply in an embodiment of the utility model;
fig. 7 is a circuit diagram showing a conversion circuit of a switching power supply in the embodiment of the utility model;
fig. 8 shows a circuit diagram of a second filter circuit of a switching power supply in an embodiment of the utility model;
fig. 9 shows a circuit diagram of a CLC filter circuit of a switching power supply in an embodiment of the present invention;
fig. 10 shows a circuit diagram of a switching circuit of a switching power supply in an embodiment of the utility model;
fig. 11 shows a circuit diagram of an RCD snubber circuit of a switching power supply in an embodiment of the utility model;
FIG. 12 is a circuit diagram of a closed loop voltage regulator circuit of a switching power supply according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "abutted" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, the switching power supply provided by the present invention converts an external ac power into a dc power usable by a load through rectification, filtering, voltage transformation, and other processes. The method specifically comprises the following steps: surge protection circuit 04, full-wave rectifier circuit 01, first filter circuit 05, switching circuit 02, converting circuit 03. The positive output current of the external alternating current passes through the surge protection circuit 04, is rectified by the full-wave rectification circuit 01, then, the direct current flows out from the positive voltage output end of the full-wave rectification circuit 01, passes through the common-mode inductor T1, then, the direct current voltage is filtered by the filter capacitor in the first filter circuit 05 to obtain stable voltage and current, then, the stable voltage and current reach the conversion circuit 03 to provide electric energy for a load, and then, the current passes through the switch circuit 02, returns to the negative voltage input end of the full-wave rectification circuit 01, and flows out through the negative voltage phase in the three-phase current. The switching circuit 02 comprises a switching chip, a 8235S high-voltage-resistant chip produced by Hangzhou Deming electronics is adopted in the embodiment of the utility model, direct current is converted into a pulse form by controlling the on-off of the switching chip in the switching circuit 02, and voltage is converted into a range in which a load can be used by combining with a high-frequency transformer 07 in a conversion circuit 03.
The input end of the surge protection circuit 04 is connected with an external alternating current end, and the output end of the surge protection circuit 04 is connected with the input end of the full-wave rectification circuit 01. Specifically, the surge protection circuit 04 is used for protecting the circuit from being damaged by surge, as shown in fig. 3, in order to meet the requirement of eliminating most of surge in 9.4.7 of the measurement standard JJF1245.1, one end of each of the three piezoresistors RV1, RV2 and RV3 is connected with an alternating current input end, and the other end of each piezoresistor is connected with a zero line.
The input end of the full-wave rectifying circuit 01 is connected with the output end of the surge protection circuit 04, and the full-wave rectifying circuit is used for rectifying the received external alternating current to obtain direct current. Specifically, as shown in fig. 4, the switching power supply provided by the embodiment of the utility model can normally supply power when any one or two voltages are interrupted in order to meet the requirements in item 9.3.9 of the JJF1245.1 standard. The full-wave rectifying circuit 01 is composed of diodes D1-D8 and can be applied to a single-phase or multi-phase alternating current input circuit. In one embodiment, the switching power supply provided by the utility model is applied to three-phase four-wire system alternating current, and full-wave rectification ensures that two paths supply power to a circuit under the condition that A, B, C, N has any missing two paths, so that the whole normal operation can be ensured, and the power supply stability of the power supply is improved.
Specifically, in an embodiment, the switching power supply provided in the embodiment of the present invention further includes: common mode inductance T1 and differential mode interference rejection capacitance C1. As shown in fig. 1, 2, and 5, the positive input terminal of the common mode inductor is connected to the positive voltage output terminal of the full-wave rectification circuit, the negative output terminal of the common mode inductor is connected to the negative voltage input terminal of the full-wave rectification circuit, the positive output terminal of the common mode inductor is connected to the primary side input terminal of the conversion circuit, and the negative input terminal of the common mode inductor is connected to the output terminal of the switching circuit. The differential mode interference suppression capacitor C1 is connected between the positive voltage output terminal and the negative voltage input terminal of the full-wave rectification circuit 01. The principles of the common mode inductor T1 and the differential mode interference rejection capacitor C1 are the prior art, and the details of the present invention are not repeated.
A first end of the first filter circuit 05 is connected to the positive output end of the common mode inductor T1, and a second end of the first filter circuit is connected to the negative input end of the common mode inductor. For rectified filtering. Specifically, external alternating current is converted into direct current through the full-wave rectification circuit 01 and then flows out from a positive voltage output end of the full-wave rectification circuit, the direct current reaches the conversion circuit 03 to supply power to a load, and before the external alternating current reaches the conversion circuit 03, the direct current is subjected to smooth filtering through the charging and discharging characteristics of a filter capacitor in the first filter circuit 05 in the voltage rising and voltage falling stages, so that stable direct current voltage and current are obtained. As shown in fig. 5 and 6, the first filter circuit includes:
the voltage-sharing circuit at least comprises two resistors U11, the input end of the voltage-sharing circuit U11 is connected with the positive output end of the common-mode inductor T1, and the output end of the voltage-sharing circuit U11 is connected with the negative input end of the common-mode inductor T1;
the filter capacitors form a capacitor circuit U22 connected in series, and the capacitor circuit U22 is connected in parallel with the voltage-sharing circuit U11.
Specifically, in the capacitor circuit U22, in order to meet the requirement of item 9.4.11 in JJF1245.1, the filter capacitors C2 and C3 connected in series, which have a withstand voltage above the second specified withstand voltage value, in the embodiment of the present invention, the device is connected to a nominal voltage of 1.9 times, and after 4 hours, the device should not be damaged and can normally operate, so that the nominal voltage designed in the embodiment of the present invention needs to be 420VAC for the highest input voltage of the 220V switching power supply, and the overall withstand voltage needs to be 900VDC after the C2 and C3 are connected in series, so as to meet the highest withstand voltage standard requirement, and therefore, the withstand voltage of the capacitor needs to be above the second specified withstand voltage value 400V, and therefore, the size of the capacitor used in the embodiment of the present invention is 10 μ F/450V; in addition, the first filter circuit further comprises a voltage equalizing circuit U11 at least comprising two resistors, in the embodiment of the utility model, the voltage equalizing circuit composed of four resistors R1, R2, R3 and R4 is adopted, so that the volume of the whole power supply is smaller compared with the case that two resistors are used, the switching power supply provided by the embodiment of the utility model can be applied to equipment with higher integration level, wherein two resistors are respectively connected in parallel to the filter capacitors C2 and C3, the voltages on the C2 and C3 are equal, and the circuit stability is ensured.
The primary side input end of the conversion circuit 03 is connected with the positive output end of the common mode inductor T1, and the output end of the conversion circuit 03 is connected with the load. Specifically, as shown in fig. 1 and fig. 2, in the embodiment of the present invention, the conversion circuit 03 includes a high-frequency transformer 07, a second filter circuit 08, a CLC filter circuit 09, and a common-mode interference rejection capacitor C9. Converting the output voltage of the positive voltage output end of the received full-wave rectifying circuit 01 into a voltage suitable for a load standard through a high-frequency transformer 07, designing a second filter circuit 08 and a CLC filter circuit 09 according to the voltage, filtering and stabilizing the voltage through the second filter circuit 08, and outputting the voltage to a load with low requirement on voltage quality; the CLC filter circuit 09 controls the ripple below a predetermined level through the cooperation of the capacitor and the inductor to meet the stricter load requirements.
The primary side input end of the high-frequency transformer 07 (the same as the primary side input end of the conversion circuit 03) is connected with the positive output end of the common-mode inductor T1, the primary side output end of the high-frequency transformer 07 (the same as the primary side output end of the conversion circuit 03) is connected with the first input end of the switch circuit 02, the secondary side of the first winding of the high-frequency transformer 07 is connected with the input end of the second filter circuit 08, the secondary side of the second winding of the high-frequency transformer 07 is connected with the input end of the CLC filter circuit 09, and the secondary side of the third winding of the high-frequency transformer 07 is connected with the power supply end of the switch circuit 02. Specifically, the on/off of an 8235S chip in the switch circuit 02 is controlled to be matched with the high-frequency transformer 07, so that the voltage is converted into a range where a load can be used, for example, in one embodiment, a switching power supply is applied to a three-phase electric energy meter, the high-frequency transformer 07 converts the received voltage into a power utilization standard of a communication unit in the three-phase electric energy meter through a first winding, and the direct current is processed through a second filter circuit 08 and then is transmitted; the high-frequency transformer 07 converts the received voltage into a voltage range which can be used by a CPU (central processing unit) of the electric energy meter through a second winding, and sends the voltage range after the voltage range is processed by a CLC (CLC) filter circuit 09; the high-frequency transformer 07 converts the received voltage to a voltage range which can be used by the 8235S chip through the third winding, and supplies power to the 8235S switch chip.
The output of the second filter circuit 08 is connected to the first load for filtering and voltage-stabilizing and supplying power to the first load. Specifically, as shown in fig. 8, after being rectified by the diode D12, the rectified power is regulated and filtered by the second filter circuit composed of the capacitor C10, the capacitor C12, the capacitor C16, and the three-terminal regulator U4, so as to obtain a more accurate power signal for the load.
The output end of the CLC filter circuit 09 is connected to the second load, and is configured to reduce the output voltage ripple to a predetermined standard and supply power to the second load. Specifically, as shown in fig. 9, in some compact devices, such as a three-phase electric energy meter, the CPU power consumption of which has a high requirement on the voltage ripple, by configuring the parameters of the capacitor C11, the capacitor C13, the inductor L1, the capacitor C15, and the capacitor C17 of the CLC filter circuit 09, the output voltage ripple may be obtained to be less than 30mV in the whole input voltage range, so as to meet the power consumption requirement of the CPU of the three-phase electric energy meter.
As shown in fig. 2, a first terminal of the common mode interference rejection capacitor C9 is connected to a primary ground (GND terminal), and a second terminal of the common mode interference rejection capacitor C9 is connected to a secondary ground (PGND), so as to suppress radio interference when the 8235S chip is powered on, so as to avoid radio interference from affecting other parts of the circuit. The use of the common-mode inductor T1, the differential-mode interference rejection capacitor C1 and the common-mode interference rejection capacitor C9 makes the whole system meet the 9.3.16 requirement in GB _ T17215.211-2020 (radio interference rejection test).
The switching circuit 02 is used for converting a direct-current continuous electric signal into a pulse electric signal, so that the high-frequency transformer 07 is matched to convert voltage into a voltage within an acceptable range of a load. The first input end of the switch circuit 02 is connected with the primary side output end of the conversion circuit 03, and the output end of the switch circuit 02 is connected with the negative voltage input end of the full-wave rectification circuit 01; the switch circuit 02 includes at least a switch chip having a withstand voltage larger than a specified withstand voltage value. Specifically, as shown in fig. 1 and fig. 2, a current flows from the primary side output terminal of the high-frequency transformer 07 to the switching circuit 02, and returns to the negative voltage input terminal of the full-wave rectification circuit 01 through the output terminal (PGND terminal) of the switching circuit 02, so as to reach the negative voltage phase of the external alternating current, thereby forming a loop. The switch chip is a switch power supply chip with a built-in MOS tube and a withstand voltage value larger than 1000VAC, as shown in figure 10, the switch circuit 02 is designed based on an 8235S chip produced by Hangzhou Delonging electrons, the 8235S chip is internally provided with a withstand voltage 1200VDC MOS tube, and compared with a common high-input voltage power supply scheme, the switch tube is omitted, and a peripheral circuit is simple. While the voltage resistance of a general switching power supply chip is about 700VDC, according to the standard of item 9.4.11 in JJF1245.1, 590VDC is obtained after rectification at the time of 420VAC input, and a high frequency transformer 07 is provided in the switching power supply to adjust the voltage range to the load usable range, and the general power supply chip is basically damaged by the reflected voltage. And 8235S embeds multiple protection measures such as excess temperature, overload, overcurrent, compare 8235S chip reliability higher. Wherein, the MOS tube in the 8235S chip is used as a switch, and the on-off frequency and the duty ratio are controlled, so that the voltage value in an ideal range is obtained. The switching power supply adopts a flyback topological structure, so that the circuit design is simple and convenient, when an MOS (metal oxide semiconductor) tube built in an 8235S chip is switched on, a primary coil of a high-frequency transformer 07 stores energy, and when the MOS tube is switched off, the high-frequency transformer 07 releases the stored energy to a load and an output capacitor. Therefore, the normal function of the switching power supply is ensured, and the standard in 9.4.11 of JJF1245.1 is met, so that the switching power supply can normally work under the input voltage of 20-420 VAC.
Further, as shown in fig. 1, in this embodiment, the method further includes:
and the RCD absorption circuit 06 is used for absorbing energy of leakage inductance of the high-frequency transformer 07 so as to protect the circuit stability. The input end of the RCD absorption circuit is connected with the primary side output end of the high-frequency transformer 07, and the output end of the RCD absorption circuit is connected with the primary side input end of the high-frequency transformer 07. Specifically, as shown in fig. 11, an RCD circuit is composed of a resistor R6, a capacitor C6, and a diode D10, and when a switch chip in the switch circuit is turned off, the energy of leakage inductance of the high-frequency transformer 07 is absorbed to reduce voltage stress of an MOS built in 8235S, and a TVS tube D9 is added to protect the TVS tube double, so that the circuit is more stable.
The closed-loop voltage stabilizing circuit 10 receives a feedback voltage generated by the load output circuit to perform closed-loop regulation according to the calibration voltage, thereby stabilizing the output voltage to the load. Specifically, the closed-loop voltage stabilizing circuit is connected with the secondary side of the second winding, the output end of the closed-loop voltage stabilizing circuit is connected with the ground, and the control end of the closed-loop voltage stabilizing circuit is connected with the voltage stabilizing end of the switch circuit. The voltage output by the secondary side of the second winding to the closed-loop voltage stabilizing circuit 10 is the feedback voltage. Specifically, a feedback circuit commonly used in a conventional switching power supply is a primary side feedback (open loop), which has the advantages of simple circuit and low cost, but has the disadvantage that the stability of an output voltage is not good as that of a closed loop. Therefore, the embodiment of the utility model further improves the power stability by adopting the closed-loop voltage stabilizing circuit 10. As shown in fig. 12, the calibration voltage of the closed-loop voltage regulator circuit 10 is set to +5V according to the feedback voltage of the output voltage, and once the feedback voltage is higher than +5V of the calibration standard, that is, the voltage of the reference pin (pin 1 of U3 in fig. 11) of the TL431 is increased, which is equivalent to the voltage increase at the reverse input end of the internal operational amplifier 431, and the voltage of the negative electrode (pin 3 of U3 in fig. 11) is equivalent to the output end of the operational amplifier, and the voltage of the negative electrode is reduced, the current flowing through the linear optocoupler diode in U2 is increased, the current of the linear optocoupler triode is simultaneously increased, and the COMP pin (regulator) conducting 8235S is grounded. 8235S, the voltage of the COMP pin is reduced, the voltage of the reverse input end of an internal comparator is reduced, the duty ratio is reduced, and the output voltage is reduced. The opposite happens when +5V is low, so that the regulation of the whole feedback voltage is realized.
Through the above description of the respective parts, the present invention provides a switching power supply, referring to fig. 1 and 2, including: full-wave rectifier circuit 01, switching circuit 02 based on 8235S chip and switching circuit 03. Can work normally in the input voltage range of 40-420VAC, thereby meeting wider applicable conditions. The full-wave rectifying circuit 01 enables the power supply to work normally even if one or two phases are missing due to a line fault when the power supply is applied to a three-phase four-wire system multi-phase power. The switch circuit 02 based on 8235S chip makes the power supply small in size and light in weight, is convenient to be applied to various compact devices, has 8235S chip withstand voltage up to 1200VAC, is internally provided with various protection measures, and improves the stability of the power supply. In addition, the surge protection circuit 04, the RCD absorption circuit 06, the closed-loop voltage stabilizing circuit 10, the common-mode inductor T1, the differential-mode interference suppression capacitor C1 and the common-mode interference suppression capacitor C9 further guarantee the stability of the power supply. The CLC filter circuit 09 greatly reduces the ripple of the output voltage and reduces the output interference. By combining the design of the element circuit, the power supply can normally work under the input voltage of 40-420VAC range on the premise of meeting the standards in GB/T17215.211-2021, GB/T17215.321-2021 and JJF 1245.1.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A switching power supply, characterized in that the power supply comprises:
the input end of the full-wave rectifying circuit is connected with the external alternating current end;
the primary side input end of the conversion circuit is connected with the positive voltage output end of the full-wave rectification circuit, and the output end of the conversion circuit is connected with a load;
the first input end of the switching circuit is connected with the primary side output end of the conversion circuit, and the output end of the switching circuit is connected with the negative voltage input end of the full-wave rectification circuit; the switch circuit at least comprises a switch chip with withstand voltage larger than a specified withstand voltage value, and is used for converting the direct-current voltage output by the full-wave rectification circuit into pulse voltage by controlling the on-off of the switch chip.
2. The power supply of claim 1, further comprising:
and the input end of the surge protection circuit is connected with the external alternating current end, and the output end of the surge protection circuit is connected with the input end of the full-wave rectification circuit.
3. The power supply of claim 1, further comprising a common mode inductance and a differential mode interference rejection capacitance, wherein:
the positive input end of the common mode inductor is connected with the positive voltage output end of the full-wave rectification circuit, the negative output end of the common mode inductor is connected with the negative voltage input end of the full-wave rectification circuit, the positive output end of the common mode inductor is connected with the primary side input end of the conversion circuit, and the negative input end of the common mode inductor is connected with the output end of the switch circuit;
the differential mode interference suppression capacitor is connected between a positive voltage output end and a negative voltage input end of the full-wave rectification circuit.
4. The power supply of claim 3, further comprising:
and a first end of the first filter circuit is connected with the positive output end of the common-mode inductor, and a second end of the first filter circuit is connected with the negative input end of the common-mode inductor.
5. The power supply of claim 4, wherein the first filter circuit comprises:
the voltage-sharing circuit at least comprises two resistors, the input end of the voltage-sharing circuit is connected with the positive output end of the common-mode inductor, and the output end of the voltage-sharing circuit is connected with the negative input end of the common-mode inductor;
the filter capacitors are connected in series to form a capacitor circuit, and the capacitor circuit is connected with the voltage-sharing circuit in parallel.
6. The power supply of claim 5, wherein the second specified withstand voltage value is 400 VAC.
7. The power supply of claim 3, wherein the conversion circuit comprises: high frequency transformer, second filter circuit, CLC filter circuit and common mode interference rejection electric capacity, the load includes first load and second load, wherein:
the primary side input end of the high-frequency transformer is connected with the positive output end of the common-mode inductor, the primary side output end of the high-frequency transformer is connected with the first input end of the switch circuit, the secondary side of the first winding of the high-frequency transformer is connected with the input end of the second filter circuit, the secondary side of the second winding of the high-frequency transformer is connected with the input end of the CLC filter circuit, and the secondary side of the third winding of the high-frequency transformer is connected with the power supply end of the switch circuit;
the output end of the second filter circuit is connected with the first load;
the output end of the CLC filter circuit is connected with the second load;
a common mode interference rejection capacitance having a first end connected to a primary ground and a second end connected to a secondary ground.
8. The power supply of claim 7, further comprising:
and the input end of the RCD absorption circuit is connected with the primary side output end of the conversion circuit, and the output end of the RCD absorption circuit is connected with the primary side input end of the conversion circuit.
9. The power supply of claim 7, further comprising:
and the input end of the closed-loop voltage stabilizing circuit is connected with the secondary side of the second winding, the output end of the closed-loop voltage stabilizing circuit is connected with the ground, and the control end of the closed-loop voltage stabilizing circuit is connected with the voltage stabilizing end of the switch circuit.
10. The power supply of claim 1, wherein the switch chip is an 8235S chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121866057.1U CN215734027U (en) | 2021-08-10 | 2021-08-10 | Switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121866057.1U CN215734027U (en) | 2021-08-10 | 2021-08-10 | Switch power supply |
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| CN215734027U true CN215734027U (en) | 2022-02-01 |
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| CN202121866057.1U Expired - Fee Related CN215734027U (en) | 2021-08-10 | 2021-08-10 | Switch power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085555A (en) * | 2022-05-20 | 2022-09-20 | 荣耀终端有限公司 | Power supply circuit and power adapter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085555A (en) * | 2022-05-20 | 2022-09-20 | 荣耀终端有限公司 | Power supply circuit and power adapter |
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Granted publication date: 20220201 |