A dual type output stabilized AC-DC circuit

Abstract

The present application belongs to the technical field of power supply or distribution circuit device, 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, wherein the AC voltage stabilizing circuit is connected with the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit through a transformer TX1 respectively, the AC voltage stabilizing circuit is connected with a power grid and outputs voltage-stable AC power through the transformer TX1, and the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit both output voltage-stable DC power. The present application has the stable voltage function of traditional voltage stabilizing equipment and can output AC power and DC power simultaneously in the same circuit through the cooperation of the AC voltage stabilizing circuit, the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit, thereby meeting the needs of various complex application scenarios.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power supply or power distribution circuit devices, and more particularly to a dual-type output voltage-stabilized AC / DC circuit. BACKGROUND

[0002] In the technical field of power supply systems, traditional voltage stabilizing devices are usually designed in a single output mode, i.e., only one of AC voltage stabilization output or DC voltage stabilization output can be achieved. This functional limitation leads to the necessity of configuring multiple independent voltage stabilizing devices in application scenarios requiring AC / DC hybrid power supply (such as industrial automation devices, communication base stations, etc.), which not only greatly increases system complexity and device cost, but also causes energy loss due to multi-stage conversion.

[0003] Existing AC voltage stabilization technology generally adopts mechanical voltage regulation or electronic compensation schemes, and the input voltage regulation range is usually limited within ±15% (about 187V-253V), which is difficult to adapt to industrial environments or remote areas with severe grid voltage fluctuations. Especially in the scenario of 160V-250V ultra-wide input voltage, traditional devices often cause the output voltage to exceed the allowable deviation range of ±10% due to insufficient compensation stages, which seriously affects the reliability of load devices. Moreover, DC side power supply systems usually adopt single-winding rectification schemes, which are limited by the power density of transformer windings and are difficult to meet the power supply requirements of high-power DC loads. In addition, traditional full-wave rectification circuits have problems such as high conduction loss and poor ripple suppression effect, which cannot achieve efficient power superposition output.

[0004] Furthermore, existing AC / DC power supply systems are usually designed in a discrete manner, and AC voltage stabilization modules and DC rectification modules require independent transformers, resulting in large device size and serious electromagnetic interference. Although there are some AC / DC composite output products on the market, the AC side and DC side circuits lack coordinated design, and the AC / DC output voltage coupling fluctuation is easy to occur under wide voltage input, making it difficult to achieve true stable dual-output. How to build an integrated AC / DC composite output architecture to provide high-power low-ripple DC output while achieving wide-range AC voltage stabilization has become a technical problem to be solved in the field.

[0005] Therefore, the application provides a dual-type output voltage-stabilized AC / DC circuit. SUMMARY

[0006] In view of the above problems existing in the prior art, the purpose of the application is to provide a dual-type output voltage-stabilized AC / DC circuit, which not only has the stable voltage function of traditional voltage stabilizing devices, but also can output AC and DC at the same time in the same circuit, meeting the needs of various complex application scenarios.

[0007] The purpose of the application can be achieved by the following technical solutions:

[0008] A dual-type output voltage-stabilized AC / DC circuit, comprising an AC voltage-stabilizing circuit, a first DC voltage-stabilizing circuit, and a second DC voltage-stabilizing circuit, wherein the AC voltage-stabilizing circuit is connected to the first DC voltage-stabilizing circuit and the second DC voltage-stabilizing circuit respectively through a transformer TX1. The AC voltage-stabilizing circuit is connected to a power grid and outputs AC power with a stable voltage through the transformer TX1. The first DC voltage-stabilizing circuit and the second DC voltage-stabilizing circuit both output DC power with a stable voltage.

[0009] 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;

[0010] 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 rectifier 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 doubled DC output power;

[0011] The AC voltage stabilization circuit includes a four-level dynamic switching circuit network consisting of relay S1, relay S2, relay S3 and relay S4, and selects the 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. At the same time, the first DC voltage stabilization circuit and the second DC voltage stabilization 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 stabilization circuit and the positive terminal DC2+ of the second DC voltage stabilization circuit are configured in parallel to form a power superposition output.

[0012] 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, 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, thereby reducing rectification losses.

[0013] As a further preferred technical solution of the present application, the first DC voltage stabilizing circuit further comprises a capacitor C2, the capacitor C2 is electrically connected with the first full-wave rectifier diode group, the second DC voltage stabilizing circuit further comprises a capacitor C1, the capacitor C1 is electrically connected with the second full-wave rectifier diode group;

[0014] 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, the capacitance of the capacitor C2 is consistent with the capacitance of the capacitor C1, effectively balancing the output ripple of the two paths and suppressing voltage fluctuation.

[0015] As a further preferred technical solution of the present application, the AC voltage stabilizing circuit further comprises a terminal ACIN-L, the AC voltage stabilizing circuit is electrically connected with the relay S4 through the terminal ACIN-L, and is connected with the relay S1, the relay S2 and the relay S3 in sequence through the common connection point of the relay S4, so as to form a multi-stage voltage selection path.

[0016] In addition, the normally open / normal closed contacts of each relay are connected with the 160V winding, the 190V winding, the 220V winding and the 250V winding respectively, so as to form an automatic switching logic based on the input voltage.

[0017] As a further preferred technical solution of the present application, the control logic of the relay S1, the relay S2, the relay S3 and the relay S4 is:

[0018] When the input voltage is less than or equal to 160V, the relay S3 and the relay S4 are attracted, and the 160V winding is selected for voltage boosting output;

[0019] When the input voltage is less than or equal to 190V, the relay S2 and the relay S4 are attracted, and the 190V winding is selected for voltage boosting output;

[0020] When the input voltage is less than or equal to 220V, the relay S4 is attracted for straight-through output;

[0021] When the input voltage is less than or equal to 250V, the relay S1 and the relay S4 are attracted, and the 250V winding is selected for voltage boosting output.

[0022] As a further preferred technical solution of the present application, the relay S1, the relay S2, the relay S3 and the relay S4 all adopt 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.

[0023] As a further preferred technical solution of the present application, the diode D5, the diode D6, the diode D7 and the diode D8 of the first full-wave rectifier diode group are connected in a two-by-two series-parallel mode to form full-wave rectification for the right N1 winding output of the transformer TX1.

[0024] The diode D1, the diode D2, the diode D3 and the diode D4 of the second full-wave rectifier diode group are connected in a two-by-two series-parallel mode to form full-wave rectification for the right N2 winding output of the transformer TX1.

[0025] As described above, the present application provides a dual-type output voltage-stabilized AC / DC circuit, which has the following beneficial effects:

[0026] 1. The present application utilizes the above-mentioned dual-type output voltage-stabilized AC / DC circuit, compared with the prior art, through the cooperation 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 for voltage stabilization and regulation, and the output voltage is stable, and at the same time, through the rectification regulation of the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit, the output voltage is stable, and not only has the stable voltage function of traditional voltage stabilizing equipment, but also can output AC and DC in the same circuit at the same time, meeting the needs of various complex application scenarios.

[0027] 2. The present application utilizes the above-mentioned dual-type output voltage-stabilized AC / DC circuit, compared with the prior art, through the cooperation of the transformer TX1 left multi-stage compensation winding and the four-stage relay dynamic switching network, the input voltage in the range of 160V-250V is adaptively adjusted, the AC output is stabilized at 220V±5%, the adaptability in the grid fluctuation scene is significantly improved, and it is especially suitable for AC / DC load application scenarios, voltage unstable industries or remote areas; in addition, the AC voltage stabilizing circuit and the two independent DC voltage stabilizing circuits are innovatively integrated, and AC and DC are output simultaneously through the same transformer. The AC output can directly drive traditional equipment, and the two DC circuits provide doubled power through parallel superposition, meeting the demand of high-power DC load, while reducing the complexity of the system.

[0028] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0030] 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;

[0031] Figure 2 This is a working diagram of a first embodiment of a dual-type output AC / DC stabilized circuit according to the present invention;

[0032] Figure 3 This is a working diagram of a second embodiment of a dual-type output AC / DC stabilized circuit according to the present invention;

[0033] Figure 4 This is a working diagram of a third embodiment of a dual-type output AC / DC stabilized circuit according to the present invention;

[0034] Figure 5 This is a schematic diagram of the operation of a fourth embodiment of a dual-type output AC / DC stabilized circuit according to the present invention.

[0035] Summary of reference numerals and their descriptions:

[0036] 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

[0037] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0038] It is to be understood that the structures, proportions, sizes and the like shown in the drawings of the present specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the conditions of the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantial change of the technical content, is also considered as the implementation of the present application. The specific structure can be described with reference to the drawings of the patent application.

[0039] The present application provides a dual-type output voltage-stabilized AC / DC circuit, which comprises an AC voltage-stabilized circuit 100, a first DC voltage-stabilized circuit 200 and a second DC voltage-stabilized circuit 300. Figures 1 to 5 The AC voltage-stabilized circuit 100 is connected to the first DC voltage-stabilized circuit 200 and the second DC voltage-stabilized circuit 300 through a transformer TX1, and the AC voltage-stabilized circuit 100 is connected to a power grid and outputs voltage-stabilized AC power through the transformer TX1, and the first DC voltage-stabilized circuit 200 and the second DC voltage-stabilized circuit 300 both output voltage-stabilized DC power.

[0040] The AC voltage-stabilized circuit 100 realizes automatic switching and adjustment of input voltage through a left coil of the transformer TX1, and the left coil of the transformer TX1 is provided with multiple compensation windings of 0V winding, 160V winding, 190V winding, 220V winding and 250V winding.

[0041] The first DC voltage-stabilized circuit 200 and the second DC voltage-stabilized circuit 300 independently output DC power through a right N1 winding or a right N2 winding of the transformer TX1, wherein the N1 winding and the N2 winding both adopt full-wave rectification topology, and the output ends of the first DC voltage-stabilized circuit 200 and the second DC voltage-stabilized circuit 300 are connected in parallel to provide multiplied DC output power.

[0042] The AC voltage stabilization circuit 100 includes a four-level dynamic switching circuit network consisting of relay S1, relay S2, relay S3 and relay S4, and selects the 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. At the same time, the first DC voltage stabilization circuit 200 and the second DC voltage stabilization 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 stabilization circuit 200 and the positive terminal DC2+ of the second DC voltage stabilization circuit 300 are configured in parallel to form a power superposition output.

[0043] The right N1 winding and N2 winding of the transformer TX1 are both reverse-wound, 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 first full-wave rectifier diode group 210 is electrically connected to the second full-wave rectifier diode group 310, 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, thereby alternately activating the two groups of DC circuits in the positive and negative half-cycles of the AC input, thereby reducing rectification losses. The present invention adopts the design of reverse winding of the N1 / N2 windings and a cross-symmetrical layout of the full-wave rectifier diodes, so that the two DC circuits are alternately activated in the positive and negative half-cycles, thereby reducing the conduction loss of a single circuit. The parallel output design breaks through the power limitation of a single winding, and the total output power is higher than the output power of a traditional single-circuit rectifier circuit.

[0044] The first DC voltage stabilizing circuit 200 further includes a capacitor C2, which is electrically connected to the first full-wave rectifier diode group 210. The second DC voltage stabilizing circuit 300 further includes a capacitor C1, which is electrically connected to the second full-wave rectifier diode group 310.

[0045] The capacitor C2 of the first DC voltage stabilization circuit 200 and the capacitor C1 of the second DC voltage stabilization circuit 300 are configured with equal capacitance. 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 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.

[0046] The AC voltage stabilizing circuit 100 further comprises a terminal ACIN-L, the AC voltage stabilizing circuit 100 is electrically connected with the relay S4 through the terminal ACIN-L, and is connected with the relay S1, the relay S2 and the relay S3 in turn through the common connection point of the relay S4 to form a multi-stage voltage selection path.

[0047] In addition, the normally open / normal closed contacts of the relays are connected with 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.

[0048] The relays S1, S2, S3 and S4 are all magnetic latching relays, the control coil of the magnetic latching relay forms a self-powered circuit with the output of the DC voltage stabilizing circuit; based on the self-powered control logic of the magnetic latching relay, the input voltage threshold (160V / 190V / 220V / 250V) is automatically determined and the winding is switched, only a momentary driving current is needed to maintain the state, which is more energy-saving than the traditional relay.

[0049] The control logic of the relays S1, S2, S3 and S4 is as follows:

[0050] When the input voltage is less than or equal to 160V, the relays S3 and S4 are attracted to select the 160V winding for voltage boosting output;

[0051] When the input voltage is less than or equal to 190V, the relays S2 and S4 are attracted to select the 190V winding for voltage boosting output;

[0052] When the input voltage is less than or equal to 220V, the relay S4 is attracted for straight-through output;

[0053] When the input voltage is less than or equal to 250V, the relays S1 and S4 are attracted to select the 250V winding for voltage boosting output.

[0054] The diodes D5, D6, D7 and D8 of the first full-wave rectifier diode group 210 are connected in a two-by-two series-parallel manner to form full-wave rectification of the output of the right N1 winding of the transformer TX1.

[0055] The diodes D1, D2, D3 and D4 of the second full-wave rectifier diode group 310 are connected in a two-by-two series-parallel manner to form full-wave rectification of the output of the right N2 winding of the transformer TX1. Embodiment

[0056] In combination Figure 2As 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, and 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, and 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 output from the 220V winding, 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

[0057] Combine Figure 3 As shown, when the grid is connected to 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, and 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, and 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 output from the 220V winding, 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

[0058] Combine 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, and the common connection point 2 of the relay S4 is disconnected from the normally closed connection point 3, the AC power of the power grid is directly output, and a stable 220V AC power is output to the outside. 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

[0059] Combine Figure 5 As shown, when the grid is connected to 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, and 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, and 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 output from the 220V winding, 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.

[0060] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

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 connected to the first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit respectively through a transformer TX1. The AC voltage stabilizing circuit is connected to the power grid and outputs AC power with a stable voltage through the transformer TX1. The first DC voltage stabilizing circuit and the second DC voltage stabilizing circuit both output DC power with a 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 rectifier 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 doubled DC output power; The AC voltage stabilization circuit includes a four-level dynamic switching circuit network consisting of relay S1, relay S2, relay S3 and relay S4, and selects the 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. At the same time, the first DC voltage stabilization circuit and the second DC voltage stabilization 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 stabilization circuit and the positive terminal DC2+ of the second DC voltage stabilization 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 stabilization circuit and the second full-wave rectifier diode group of the second DC voltage stabilization 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, thereby reducing rectification losses.

3. The 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, the capacitor C2 being electrically connected to the first full-wave rectifier diode group, and the second DC voltage stabilizing circuit further includes a capacitor C1, the capacitor C1 being 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 adopt an isocapacitive configuration, 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. The dual-type output regulated AC / DC circuit according to claim 1, characterized in that: The AC voltage stabilizing circuit further includes a terminal ACIN-L, and is electrically connected to relay S4 via the terminal ACIN-L. The AC voltage stabilizing circuit is sequentially connected to relay S1, relay S2, and relay S3 via the common connection point of relay S4 to form a multi-stage voltage selection path. In addition, the normally open / normally closed contacts of each relay 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.

5. The dual-type output regulated AC / DC circuit according to claim 4, characterized in that: The control logic of relay S1, relay S2, relay S3 and relay S4 is: When the input voltage is ≤160V, relays S3 and S4 are energized, and the 160V winding boost output is selected; When the input voltage is ≤190V, relays S2 and 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. The 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. The dual-type output regulated AC / DC circuit according to claim 2, characterized in that: The diode D5, diode D6, diode D7 and 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 for the output of the right N1 winding of the transformer TX1; The diode D1 , diode D2 , diode D3 and 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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