Dual-type output voltage-stabilizing AC / DC circuit

Abstract

The invention belongs to the technical field of circuit devices for power supply or power distribution, and discloses a dual-type output voltage-stabilizing AC / DC circuit, which comprises an AC voltage-stabilizing circuit, a first DC voltage-stabilizing circuit and a second DC voltage-stabilizing circuit, the alternating current voltage stabilizing circuit is connected with the first direct current voltage stabilizing circuit and the second direct current voltage stabilizing circuit through a transformer TX1, and the alternating current voltage stabilizing circuit is connected into a power grid and outputs alternating current with stable voltage outwards through the transformer TX1. And the first direct current voltage stabilizing circuit and the second direct current voltage stabilizing circuit output direct current with stable voltage to the outside. Through the cooperation of the alternating current voltage stabilizing circuit, the first direct current voltage stabilizing circuit and the second direct current voltage stabilizing circuit, the voltage stabilizing function of traditional voltage stabilizing equipment is achieved, alternating current and direct current can be output in the same circuit at the same time, and the requirements of various complex application scenes are met.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit devices for power supply or distribution, and more specifically, to a voltage-stabilized AC / DC circuit with dual-type outputs. Background Art

[0002] In the field of power supply system technology, traditional voltage stabilization equipment usually adopts a single output mode design, that is, it can only achieve one of the functions of AC voltage stabilization output or DC voltage stabilization output. This functional limitation leads to the need to configure multiple independent voltage stabilization devices in application scenarios that require AC / DC hybrid power supply (such as industrial automation equipment, communication base stations, etc.), which not only greatly increases the system complexity and equipment cost, but also causes energy loss problems caused by multi-stage conversion.

[0003] Existing AC voltage stabilization technologies generally use mechanical voltage regulation or electronic compensation solutions, and their input voltage regulation range is mostly limited to ±15% (approximately 187V-253V), which is difficult to adapt to industrial environments or remote areas with severe grid voltage fluctuations. Especially in the ultra-wide input voltage scenario of 160V-250V, traditional equipment often causes the output voltage to exceed the allowable deviation range of ±10% due to insufficient compensation levels, seriously affecting the reliability of load equipment. The DC side power supply system mostly uses a single-winding rectification solution, which is limited by the power density of the transformer winding and is difficult to meet the power supply requirements of high-power DC loads. In addition, the traditional full-wave rectifier circuit has problems such as high conduction loss and poor ripple suppression effect, and cannot achieve high-efficiency power superposition output.

[0004] In addition, the AC / DC power supply system in the prior art mostly adopts a discrete design, and the AC voltage stabilization module and the DC rectifier module need to be equipped with independent transformers, resulting in bulky equipment and serious electromagnetic interference. Although there are some AC / DC composite output products on the market, their AC and DC side circuits lack coordinated design, which easily leads to coupled fluctuations in AC / DC output voltages when a wide voltage input is applied, making it difficult to achieve truly stable dual-channel output. How to build an integrated AC / DC composite output architecture that provides high-power, low-ripple DC output while achieving wide-range AC voltage stabilization has become a technical problem that needs to be solved urgently in this field.

[0005] To this end, the present invention provides a voltage-stabilizing AC / DC circuit with dual-type outputs. Summary of the invention

[0006] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a dual-type output voltage-stabilizing AC / DC circuit, which not only has the voltage stabilizing function of traditional voltage-stabilizing equipment, but can also output AC and DC power simultaneously in the same circuit to meet the needs of various complex application scenarios.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A dual-type output voltage-stabilized AC / DC circuit, comprising an AC voltage-stabilized circuit, a first DC voltage-stabilized circuit and a second DC voltage-stabilized circuit, wherein the AC voltage-stabilized circuit is respectively connected to the first DC voltage-stabilized circuit and the second DC voltage-stabilized circuit through a transformer TX1, the AC voltage-stabilized circuit is connected to a power grid and outputs AC power with a stable voltage to the outside through the transformer TX1, and the first DC voltage-stabilized circuit and the second DC voltage-stabilized circuit both output DC power with a stable voltage to the outside; The AC voltage stabilizing circuit realizes automatic switching and adjustment of the input voltage through the left coil of the transformer TX1. The left coil of the transformer TX1 is provided with a multi-stage compensation winding of 0V winding, 160V winding, 190V winding, 220V winding and 250V winding; The first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit independently output DC power through the right N1 winding or the N2 winding of the transformer TX1, wherein the N1 winding and the N2 winding both adopt a full-wave rectification topology, and the output ends of the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit are configured in parallel to provide a doubled DC output power; The AC voltage stabilizing circuit includes a four-level dynamic switching circuit network consisting of a relay S1, a relay S2, a relay S3 and a relay S4, and selects a corresponding compensation winding through the four-level dynamic switching circuit network according to the input voltage range, so that within the input voltage range of 160V-250V, the output AC power is stabilized at 220V±5% through the coordinated action of at least two groups of relays, and at the same time, the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit output 311V DC power through full-wave rectification of the N1 winding or the N2 winding, and the positive terminal DC1+ of the first DC voltage stabilizing circuit and the positive terminal DC2+ of the second DC voltage stabilizing circuit are configured in parallel to form a power superposition output.

[0008] As a further preferred technical solution of the present invention, the right side N1 winding and N2 winding of the transformer TX1 both adopt a reverse winding structure, so that the first full-wave rectifier diode group of the first DC voltage stabilizing circuit and the second full-wave rectifier diode group of the second DC voltage stabilizing circuit form a cross-symmetrical layout, the first full-wave rectifier diode group is composed of a diode D5, a diode D6, a diode D7 and a diode D8 electrically connected, the second full-wave rectifier diode group is composed of a diode D1, a diode D2, a diode D3 and a diode D4 electrically connected, the conduction direction of the first full-wave rectifier diode group is opposite to the conduction direction of the second full-wave rectifier diode group, thereby alternately activating the two groups of DC circuits in the positive and negative half cycles of the AC input, thereby reducing rectification losses.

[0009] As a further preferred technical solution of the present invention, the first DC voltage stabilizing circuit further includes a capacitor C2, and the capacitor C2 is electrically connected to the first full-wave rectifier diode group, and the second DC voltage stabilizing circuit further includes a capacitor C1, and the capacitor C1 is electrically connected to the second full-wave rectifier diode group; The capacitor C2 of the first DC voltage stabilizing circuit and the capacitor C1 of the second DC voltage stabilizing circuit are configured with equal capacitance, and the capacitance of the capacitor C2 is consistent with the capacitance of the capacitor C1, which effectively balances the output ripples of the two paths and suppresses voltage fluctuations.

[0010] As a further preferred technical solution of the present invention, the AC voltage stabilizing circuit further includes a wiring terminal ACIN-L, and the AC voltage stabilizing circuit is electrically connected to the relay S4 through the wiring terminal ACIN-L, and is sequentially connected to the relay S1, the relay S2 and the relay S3 in multiple stages through the common connection point of the relay S4 to form a multi-stage voltage selection path; In addition, each relay's normally open / normally closed contact is respectively connected to the 160V winding, the 190V winding, the 220V winding, and the 250V winding to form an automatic switching logic based on the input voltage.

[0011] As a further preferred technical solution of the present invention, the control logic of the relay S1, relay S2, relay S3 and relay S4 is: When the input voltage is ≤160V, relay S3 and relay S4 are energized, and the 160V winding boost output is selected; When the input voltage is ≤190V, relay S2 and relay S4 are energized, and the 190V winding boost output is selected; When the input voltage is ≤220V, relay S4 is energized and output is directly connected; When the input voltage is ≤250V, relay S1 and relay S4 are energized, and the 250V winding step-down output is selected.

[0012] As a further preferred technical solution of the present invention, the relay S1, relay S2, relay S3 and relay S4 are all magnetic latching relays, and the control coil of the magnetic latching relay forms a self-powered circuit with the output end of the DC voltage stabilizing circuit.

[0013] As a further preferred technical solution of the present invention, the diode D5, the diode D6, the diode D7 and the diode D8 of the first full-wave rectifier diode group are connected in series and then in parallel in pairs to form a full-wave rectification of the output of the right N1 winding of the transformer TX1; The diode D1 , the diode D2 , the diode D3 and the diode D4 of the second full-wave rectifier diode group are connected in series in pairs and then in parallel to form a full-wave rectification for the output of the right N2 winding of the transformer TX1 .

[0014] As described above, the dual-type output regulated AC / DC circuit provided by the present invention has the following beneficial effects: 1. The present invention utilizes the above-mentioned dual-type output voltage-stabilizing AC / DC circuit. Compared with the prior art, through the arrangement and coordination of the AC voltage-stabilizing circuit, the first DC voltage-stabilizing circuit and the second DC voltage-stabilizing circuit, when the grid voltage suddenly changes or the voltage fluctuates greatly, the AC voltage-stabilizing circuit can still be used to regulate the voltage to output AC power with stable voltage. At the same time, the first DC voltage-stabilizing circuit and the second DC voltage-stabilizing circuit can be used to rectify and regulate the voltage to output DC power with stable voltage. It not only has the voltage stabilizing function of traditional voltage-stabilizing equipment, but can also output AC and DC power at the same time in the same circuit, meeting the needs of various complex application scenarios.

[0015] 2. The present invention utilizes the above-mentioned dual-type output voltage-stabilizing AC / DC circuit. Compared with the prior art, the multi-stage compensation winding on the left side of the transformer TX1 and the four-stage relay dynamic switching network are coordinated to achieve adaptive adjustment of the input voltage within the range of 160V-250V, ensuring that the AC output is stable at 220V±5%, significantly improving the adaptability under power grid fluctuation scenarios, and is particularly suitable for AC / DC load application scenarios, industrial or remote areas with unstable voltage; in addition, the innovative integration of the AC voltage-stabilizing circuit and the two-way independent DC voltage-stabilizing circuits realizes AC / DC synchronous output through the same transformer. The AC output can directly drive traditional equipment, and the two-way DC circuit provides multiplied power through parallel superposition to meet the needs of high-power DC loads while reducing system complexity.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the circuit structure of a dual-type output voltage-stabilized AC / DC circuit applied for by the present invention; Figure 2This is a working schematic diagram of a first embodiment of a dual-type output AC / DC stabilized circuit according to the present invention; Figure 3 This is a working schematic diagram of a second embodiment of a dual-type output AC / DC stabilized circuit according to the present invention; Figure 4 This is a working schematic diagram of a third embodiment of a dual-type output AC / DC stabilized circuit according to the present invention; Figure 5 This is a working schematic diagram of a fourth embodiment of a dual-type output AC / DC stabilized circuit according to the present invention.

[0019] Summary of reference numerals and their descriptions: 100, AC voltage stabilizing circuit; 200, first DC voltage stabilizing circuit; 210, first full-wave rectifier diode group; 300, second DC voltage stabilizing circuit; 310, second full-wave rectifier diode group. DETAILED DESCRIPTION

[0020] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantial changes in the technical content. The specific structure can be described with reference to the drawings of the patent application.

[0022] The present invention provides a dual-type output voltage-stabilized AC / DC circuit. Figures 1 to 5 As shown, it includes an AC voltage stabilizing circuit 100, a first DC voltage stabilizing circuit 200 and a second DC voltage stabilizing circuit 300. The AC voltage stabilizing circuit 100 is connected to the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 respectively through a transformer TX1. The AC voltage stabilizing circuit 100 is connected to the power grid and outputs AC power with stable voltage to the outside through the transformer TX1. The first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 both output DC power with stable voltage to the outside. The AC voltage stabilizing circuit 100 realizes automatic switching and adjustment of the input voltage through the left coil of the transformer TX1, and the left coil of the transformer TX1 is provided with a multi-stage compensation winding of 0V winding, 160V winding, 190V winding, 220V winding and 250V winding; The first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 independently output DC power through the right N1 winding or N2 winding of the transformer TX1, wherein the N1 winding and the N2 winding both adopt a full-wave rectification topology, and the output ends of the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 are configured in parallel to provide a doubled DC output power; The AC voltage stabilizing circuit 100 includes a four-level dynamic switching circuit network consisting of a relay S1, a relay S2, a relay S3 and a relay S4, and selects a corresponding compensation winding through the four-level dynamic switching circuit network according to the input voltage range, so that within the input voltage range of 160V-250V, the output AC power is stabilized at 220V±5% through the coordinated action of at least two groups of relays, and at the same time, the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 output 311V DC power through full-wave rectification of the N1 winding or the N2 winding, and the positive terminal DC1+ of the first DC voltage stabilizing circuit 200 and the positive terminal DC2+ of the second DC voltage stabilizing circuit 300 are configured in parallel to form a power superposition output.

[0023] The right N1 winding and N2 winding of the transformer TX1 both adopt a reverse winding structure, so that the first full-wave rectifier diode group 210 of the first DC voltage stabilizing circuit 200 and the second full-wave rectifier diode group 310 of the second DC voltage stabilizing circuit 300 form a cross-symmetrical layout, the first full-wave rectifier diode group 210 is composed of a diode D5, a diode D6, a diode D7 and a diode D8 electrically connected, and the second full-wave rectifier diode group 310 is composed of a diode D1, a diode D2, a diode D3 and a diode D8 electrically connected. The tube D4 is electrically connected, and the conduction direction of the first full-wave rectifier diode group 210 is opposite to the conduction direction of the second full-wave rectifier diode group 310, so that the two groups of DC circuits are alternately activated in the positive and negative half cycles of the AC input, thereby reducing the rectification loss; and the present invention adopts the design of reverse winding of N1 / N2 windings and cross-symmetrical layout of full-wave rectifier diodes, so that the two DC circuits are alternately activated in the positive and negative half cycles, reducing the single-path conduction loss, and the parallel output design breaks through the single-winding power limitation, and the total output power is higher than the output power of the traditional single-path rectifier circuit.

[0024] The first DC voltage stabilizing circuit 200 further includes a capacitor C2, and the capacitor C2 is electrically connected to the first full-wave rectifier diode group 210. The second DC voltage stabilizing circuit 300 further includes a capacitor C1, and the capacitor C1 is electrically connected to the second full-wave rectifier diode group 310. The capacitor C2 of the first DC voltage stabilizing circuit 200 and the capacitor C1 of the second DC voltage stabilizing circuit 300 are configured with equal capacitance, and the capacitance of the capacitor C2 is consistent with the capacitance of the capacitor C1, which effectively balances the output ripples of the two paths and suppresses the voltage fluctuation to within ±2%; at the same time, it reduces the problem of uneven power distribution caused by differences in component parameters and extends the life of the capacitor.

[0025] The AC voltage stabilizing circuit 100 further includes a connection terminal ACIN-L, and the AC voltage stabilizing circuit 100 is electrically connected to the relay S4 through the connection terminal ACIN-L, and is sequentially connected to the relay S1, the relay S2, and the relay S3 in multiple stages through the common connection point of the relay S4 to form a multi-stage voltage selection path; In addition, each relay's normally open / normally closed contacts are connected to the 160V winding, the 190V winding, the 220V winding, and the 250V winding, respectively, to form an automatic switching logic based on the input voltage; The relays S1, S2, S3 and S4 are all magnetic latching relays. The control coil of the magnetic latching relay and the output end of the DC voltage stabilizing circuit form a self-powered circuit. Based on the self-powered control logic of the magnetic latching relay, automatic judgment of the input voltage threshold (160V / 190V / 220V / 250V) and winding switching are realized. Only a momentary driving current is required to maintain the state, which is more energy-efficient than traditional relays.

[0026] The control logic of the relay S1, relay S2, relay S3 and relay S4 is: When the input voltage is ≤160V, relay S3 and relay S4 are energized, and the 160V winding boost output is selected; When the input voltage is ≤190V, relay S2 and relay S4 are energized, and the 190V winding boost output is selected; When the input voltage is ≤220V, relay S4 is energized and output is directly connected; When the input voltage is ≤250V, relay S1 and relay S4 are energized, and the 250V winding step-down output is selected.

[0027] The diode D5, the diode D6, the diode D7 and the diode D8 of the first full-wave rectifier diode group 210 are connected in series and then in parallel in pairs, so as to form a full-wave rectification for the output of the right N1 winding of the transformer TX1; The diode D1 , the diode D2 , the diode D3 and the diode D4 of the second full-wave rectifier diode group 310 are connected in series in pairs and then in parallel to form a full-wave rectification for the output of the right N2 winding of the transformer TX1 . Example

[0028] Combination Figure 2 As shown, when the voltage connected to the power grid is 0-160V, the relay S3 and the relay S4 are energized, the common connection point 2 of the relay S3 is connected to the normally open connection point 1, the common connection point 2 of the relay S3 is disconnected from the normally closed connection point 3, the common connection point 2 of the relay S4 is connected to the normally open connection point 1, the common connection point 2 of the relay S4 is disconnected from the normally closed connection point 3, the grid AC power is input from the 160V winding, and the 220V winding is output, and a stable 220V AC power is output to the outside, and the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 both output a stable 311V DC power to the outside. Example

[0029] Combination Figure 3 As shown, when connected to the power grid of 0-190V, the relay S2 and the relay S4 are energized, the common connection point 2 of the relay S2 is connected to the normally open connection point 1, the common connection point 2 of the relay S2 is disconnected from the normally closed connection point 3, the common connection point 2 of the relay S4 is connected to the normally open connection point 1, the common connection point 2 of the relay S4 is disconnected from the normally closed connection point 3, the grid AC power is input from the 190V winding, and the 220V winding is output, and a stable 220V AC power is output to the outside, and the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 both output a stable 311V DC power to the outside. Example

[0030] Combination Figure 4 As shown, when the voltage connected to the power grid is 0-220V, the relay S4 is energized, the common connection point 2 of the relay S4 is connected to the normally open connection point 1, the common connection point 2 of the relay S4 is disconnected from the normally closed connection point 3, the power grid AC power is directly output, and a stable 220V AC power is output to the outside, and the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 both output a stable 311V DC power to the outside. Example

[0031] Combination Figure 5As shown, when connected to the power grid of 0-250V, the relay S1 and the relay S4 are energized, the common connection point 2 of the relay S1 is connected to the normally open connection point 1, the common connection point 2 of the relay S1 is disconnected from the normally closed connection point 3, the common connection point 2 of the relay S4 is connected to the normally open connection point 1, the common connection point 2 of the relay S4 is disconnected from the normally closed connection point 3, the grid AC power is input from the 250V winding, and the 220V winding is output, and a stable 220V AC power is output to the outside, and the first DC voltage stabilizing circuit 200 and the second DC voltage stabilizing circuit 300 both output a stable 311V DC power to the outside.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A dual-type output regulated AC / DC circuit, characterized in that: It includes an AC voltage stabilizing circuit, a first DC voltage stabilizing circuit and a second DC voltage stabilizing circuit, the AC voltage stabilizing circuit is respectively connected to the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit through a transformer TX1, the AC voltage stabilizing circuit is connected to the power grid and outputs AC power with stable voltage through the transformer TX1, and the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit both output DC power with stable voltage; The AC voltage stabilizing circuit realizes automatic switching and adjustment of the input voltage through the left coil of the transformer TX1. The left coil of the transformer TX1 is provided with a multi-stage compensation winding of 0V winding, 160V winding, 190V winding, 220V winding and 250V winding; The first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit independently output DC power through the right N1 winding or the N2 winding of the transformer TX1, wherein the N1 winding and the N2 winding both adopt a full-wave rectification topology, and the output ends of the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit are configured in parallel to provide a doubled DC output power; The AC voltage stabilizing circuit includes a four-level dynamic switching circuit network consisting of a relay S1, a relay S2, a relay S3 and a relay S4, and selects a corresponding compensation winding through the four-level dynamic switching circuit network according to the input voltage range, so that within the input voltage range of 160V-250V, the output AC power is stabilized at 220V±5% through the coordinated action of at least two groups of relays, and at the same time, the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit output 311V DC power through full-wave rectification of the N1 winding or the N2 winding, and the positive terminal DC1+ of the first DC voltage stabilizing circuit and the positive terminal DC2+ of the second DC voltage stabilizing circuit are configured in parallel to form a power superposition output.

2. A dual-type output regulated AC / DC circuit according to claim 1, characterized in that: The right side N1 winding and N2 winding of the transformer TX1 both adopt a reverse winding structure, so that the first full-wave rectifier diode group of the first DC voltage stabilizing circuit and the second full-wave rectifier diode group of the second DC voltage stabilizing circuit form a cross-symmetrical layout. The first full-wave rectifier diode group is composed of a diode D5, a diode D6, a diode D7 and a diode D8 electrically connected, and the second full-wave rectifier diode group is composed of a diode D1, a diode D2, a diode D3 and a diode D4 electrically connected. The conduction direction of the first full-wave rectifier diode group is opposite to the conduction direction of the second full-wave rectifier diode group, thereby alternately activating the two groups of DC circuits in the positive and negative half cycles of the AC input to reduce rectification losses.

3. A dual-type output regulated AC / DC circuit according to claim 2, characterized in that: The first DC voltage stabilizing circuit further includes a capacitor C2, and the capacitor C2 is electrically connected to the first full-wave rectifier diode group. The second DC voltage stabilizing circuit further includes a capacitor C1, and the capacitor C1 is electrically connected to the second full-wave rectifier diode group. The capacitor C2 of the first DC voltage stabilizing circuit and the capacitor C1 of the second DC voltage stabilizing circuit are configured with equal capacitance, and the capacitance of the capacitor C2 is consistent with the capacitance of the capacitor C1, which effectively balances the output ripples of the two paths and suppresses voltage fluctuations.

4. A dual-type output regulated AC / DC circuit according to claim 1, characterized in that: The AC voltage stabilizing circuit further includes a wiring terminal ACIN-L, and the AC voltage stabilizing circuit is electrically connected to the relay S4 through the wiring terminal ACIN-L, and is sequentially connected to the relay S1, the relay S2, and the relay S3 in multiple stages through the common connection point of the relay S4 to form a multi-stage voltage selection path; In addition, each relay's normally open / normally closed contact is respectively connected to the 160V winding, the 190V winding, the 220V winding, and the 250V winding to form an automatic switching logic based on the input voltage.

5. A dual-type output regulated AC / DC circuit according to claim 4, characterized in that: The control logic of the relay S1, relay S2, relay S3 and relay S4 is: When the input voltage is ≤160V, relay S3 and relay S4 are energized, and the 160V winding boost output is selected; When the input voltage is ≤190V, relay S2 and relay S4 are energized, and the 190V winding boost output is selected; When the input voltage is ≤220V, relay S4 is energized and output is directly connected; When the input voltage is ≤250V, relay S1 and relay S4 are energized, and the 250V winding step-down output is selected.

6. A dual-type output regulated AC / DC circuit according to claim 5, characterized in that: The relay S1, relay S2, relay S3 and relay S4 are all magnetic latching relays, and the control coil of the magnetic latching relay and the output end of the DC voltage stabilizing circuit form a self-powered circuit.

7. A dual-type output regulated AC / DC circuit according to claim 2, characterized in that: The diode D5, the diode D6, the diode D7 and the diode D8 of the first full-wave rectifier diode group are connected in series and then in parallel in pairs, so as to form a full-wave rectification for the output of the right N1 winding of the transformer TX1; The diode D1 , the diode D2 , the diode D3 and the diode D4 of the second full-wave rectifier diode group are connected in series in pairs and then in parallel to form a full-wave rectification for the output of the right N2 winding of the transformer TX1 .

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