CN210431249U - Multi-voltage output circuit with self-heating function - Google Patents

Abstract

The utility model discloses a multi-voltage output circuit with self-heating function, which comprises an AC input line for AC input, a protection module, a rectifier module capable of converting AC into DC, and a heat-generating output module; the protection module is connected with the alternating current input line and is connected with alternating current through the alternating current input line to enter the protection module, and the output end of the protection module is connected with the input end of the rectification module; the heat production output module comprises at least 1 divider resistor, the divider resistor is connected with the output end of the rectification module, the divider resistor generates heat in the voltage reduction process to supply to external equipment, and at least 1 output voltage point is led out after the voltage reduction process is finished; and a driving voltage point is also directly led out from the output end of the rectifying module. The multi-voltage output circuit is simple and safe in structure, the circuit can output in two paths, and in the voltage reduction process, the voltage dividing resistor can lose itself to generate heat to be used as a heat output source of external equipment for drying and dehumidifying.

Description

Multi-voltage output circuit with self-heating function

Technical Field

The utility model belongs to the technical field of the circuit, in particular to can utilize the drive circuit of the heat as the output heat source of outside product that the circuit produced when exporting different voltages.

Background

Most electronic products are required to be used under dry conditions, the service performance of the electronic products is often related to humidity, the harm of humidity to electronic components is one of main factors influencing the service performance of the electronic components, and in addition, the temperature also has certain influence on the electronic components.

For example, in an integrated circuit (chip), moisture is harmful to the semiconductor industry mainly because moisture can penetrate through a plastic package of the integrated circuit and invade the integrated circuit from a pin gap, so that the integrated circuit absorbs moisture, which easily causes product failure, and at this time, the integrated circuit needs to be dried, dehumidified and kept dry. In addition, for a material having a conductivity between a conductor and an insulator at a normal temperature, since a change in temperature has a great influence on the conductivity, a threshold voltage, and a switching characteristic of the semiconductor, a chip usually includes millions or even tens of millions of transistors and other devices, and the accumulation of small deviations per point may cause a great influence on an external characteristic of the semiconductor. If the temperature is too low, the chip can not open the internal semiconductor switch under the rated operating voltage, so that the chip can not work normally.

For example, a conventional lithium ion battery has advantages of long life, high specific energy, low self-discharge rate, no memory effect, and the like, and occupies a leading position in the global secondary battery market, and is widely used in the fields of portable electronic devices, industrial applications, electric vehicles, and the like. However, when the lithium ion battery is in a low temperature environment (generally, below zero, for example, when the lithium ion battery is used in an underwater device with a depth of tens of meters or more), the battery has phenomena of discharge capacity attenuation, discharge voltage reduction, cycle rate performance reduction, electrode lithium deposition and the like at normal temperature. The capacity of a general lithium ion battery at minus 40 ℃ is only about 20 percent of the capacity at room temperature. The poor low-temperature performance of the lithium battery seriously restricts the use of the lithium battery in a severe cold environment. Besides the temperature, the humidity is also considered, and particularly when the device is used underwater, such as an underwater fish gathering lamp, it is difficult to prevent water from entering the device from a tiny gap, and if the device is not dried and dehumidified, electronic components in the device are damaged, which seriously results in that the device cannot be used.

In order to ensure that electronic components (such as chips and batteries) or equipment (such as underwater fish gathering lamps) and the like can normally work at low temperature (such as deep sea), the requirement on a circuit is high generally, and besides the requirement that the circuit has normal power supply driving, the circuit can dry and dehumidify the electronic components (or an internal shell of the equipment) by utilizing self conditions and ensure the normal temperature of the electronic components is also important.

Patent CN201310064305.4 discloses a multi-voltage power supply including a transformer, a first output circuit for generating a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller for controlling a voltage supplied to a primary winding of the transformer according to the first output voltage, wherein the multi-voltage power supply includes: second to Nth output circuits for generating second to Nth output voltages, respectively, using the voltage transferred to the secondary winding of the transformer; and second to Nth output voltage controllers for linearly controlling output of the second to Nth output voltages, respectively, by feeding back the second to Nth output voltages. The present invention can independently control a plurality of output circuits on the secondary winding side of a transformer for realizing a plurality of (at least two) output voltages, and particularly, can stably control a plurality of output voltages regardless of the number of output voltages by linearly controlling the plurality of output circuits. However, the above circuit cannot dry and dehumidify the heat source connected to the external device case or the electronic components in the case.

Disclosure of Invention

In order to solve the above problems, the present invention provides a multi-voltage output circuit having a self-heating function, which is simple and safe, and can output different voltages, and utilize the heat generated by self-loss as the output heat source of the external device, and can perform the heat transfer function by sandwiching the heat dissipation sheet on the resistor body.

Another object of the present invention is to provide a multi-voltage output circuit with self-heating function, the four-stage divider resistor of the circuit utilizes the self-loss and the heat produced as the output heat source of the external device in the pressure drop process, and the external device is dried and dehumidified and hot air is delivered, so that the external device using the driving circuit can be normally used at low temperature (such as deep sea), and can drive the LED light source with certain power (for example, above 18V/60 mA) to perform power-on illumination.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a multi-voltage output circuit with self-heating function comprises an alternating current input line for inputting alternating current, a protection module, a rectifying module capable of converting the alternating current into direct current, and a heat generation output module; the protection module is connected with the alternating current input line and is connected with alternating current through the alternating current input line to enter the protection module, and the output end of the protection module is connected with the input end of the rectification module; the heat generation output module comprises at least 1 divider resistor, the divider resistor is connected with the output end of the rectification module, the divider resistor generates heat in the voltage reduction process and supplies the heat to external equipment, and at least 1 output voltage point is led out after the voltage reduction process is finished; and a driving voltage point is also directly led out from the output end of the rectifying module.

In the utility model, the alternating current is input into the circuit through the alternating current input line, and in order to protect the circuit, a protection module is needed to be arranged, so that the circuit is prevented from being damaged by the voltage or the current of destructive impurities mixed in the alternating current entering the circuit, and the safety and reliability of the circuit are improved; the rectifier module converts the obtained alternating current into required direct current, a driving voltage point can be led out from the output end of the rectifier module, and the rectifier module can be connected with a heat-generating output module, so that the circuit can be output in two paths, one path can be directly output to be used as driving voltage for required components, the other path leads out the output voltage point to be output to required loads after the voltage drop process of a plurality of voltage-dividing resistors, in addition, in the voltage drop process, the voltage-dividing resistors can lose themselves to generate heat to be used as heat output sources of external equipment, and usually, heat radiating fins can be clamped on the voltage-dividing resistor body to conduct heat in practice; wherein the current of the output voltage point depends on the size of the load. In addition, the circuit comprises an alternating current input line for inputting alternating current, a protection module, a rectifying module capable of converting the alternating current into direct current and a heat generation output module, and the circuit is simple in structure and capable of achieving required functions.

Specifically, the alternating current input line comprises an alternating current zero line and an alternating current live line, and the protection module comprises a first Y capacitor, a second Y capacitor, a switch, a first fuse, a second fuse, a first voltage dependent resistor and a second voltage dependent resistor; one end of the first Y capacitor and one end of the second Y capacitor are both grounded, and the other end of the first Y capacitor and the other end of the second Y capacitor are respectively connected with the alternating current live wire and the alternating current zero line; the other end of the first Y capacitor is also connected with the switch, and the first fuse and the first Y capacitor are electrically conducted when the switch is closed; the second fuse is connected to the alternating current live wire, two ends of the first voltage dependent resistor and two ends of the second voltage dependent resistor are respectively connected with the alternating current zero line and the alternating current live wire, and the first voltage dependent resistor and the second voltage dependent resistor are located between the first fuse and the second fuse; the protection module further comprises an X capacitor, two ends of the X capacitor are respectively connected with the alternating current zero line and the alternating current live line, and the X capacitor is further connected to the input end of the rectification module in parallel.

In consideration of safety, a first Y capacitor and a second Y capacitor are generally connected when an alternating current power supply is connected, the safety performance of the first Y capacitor and the second Y capacitor can be enhanced, and a first fuse, a second fuse, a first voltage dependent resistor, a second voltage dependent resistor and an X capacitor are all protection circuits, so that destructive impurity current or voltage cannot damage a rectification module after the alternating current is connected; and because of the non-volt-ampere characteristic of the piezoresistor, the piezoresistor is designed in the protection module, and when the input alternating voltage rises suddenly, the resistance of the piezoresistor increases along with the increase of the input voltage for the protection circuit, so that the protection effect is achieved. In practice, a relay may be connected to the switch.

Specifically, the rectifying module comprises a rectifying IC, the X capacitor is connected in parallel to an input end of the rectifying IC, an output end of the rectifying IC is connected with the voltage dividing resistor, and a driving voltage point is further led out from the output end of the rectifying IC; the specific model of the rectifying IC is GBU 410. The rectifying IC with the model number of GBU410 can convert alternating current into direct current, can work continuously, stably and efficiently, does not generate heat in the long-time working process, and has the characteristic of high voltage resistance.

Specifically, the circuit further comprises a filter module, wherein the filter module comprises a filter capacitor, and the filter capacitor is connected in parallel to the output end of the rectifier IC. Because alternating current is converted into direct current through the rectifier IC and is output, the voltage without noise waves can not be obtained in a hundred percent in practice, and in order to remove noise waves as much as possible, a filter capacitor is connected to the output end of the rectifier IC.

Specifically, the voltage dividing resistors include a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor and a fourth voltage dividing resistor, an input end of the first voltage dividing resistor is connected with an output end of the rectifying IC, the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor are sequentially connected in series, and a voltage reduction self-heating process is performed; the direct current output by the rectification IC is subjected to voltage reduction through a first voltage division resistor, a second voltage division resistor, a third voltage division resistor and a fourth voltage division resistor in sequence, then an output voltage point is led out, and heat is generated in the voltage reduction process and supplied to external equipment; the heat generation output module further comprises a voltage-stabilizing tube, and the voltage-stabilizing tube is connected to two ends of the fourth voltage-dividing resistor in parallel.

The divider resistors comprise a first divider resistor, a second divider resistor, a third divider resistor and a fourth divider resistor, the heat production output module can be designed into four-section type voltage reduction to lead out an output voltage point in practice, direct-current voltage is output here, the voltage of the output voltage point is known, then the output current can be obtained through calculation of the first divider resistor, the second divider resistor, the third divider resistor and the fourth divider resistor, the four-section voltage reduction is realized by utilizing the first divider resistor, the second divider resistor, the third divider resistor and the fourth divider resistor, heat generated by self loss in the voltage reduction process is used as an output heat source of external equipment, the external equipment is dried and hot air is conveyed, and the external equipment using the driving circuit can be normally used under low temperature (such as deep sea) through dehumidification. The voltage dividing resistor can be a carbon film or a cement resistor. In practice, the fourth voltage dividing resistor is usually grounded, and in order to avoid noise mixing during grounding, a plurality of capacitors are usually connected between the output voltage point and the ground point for filtering.

Specifically, the circuit further comprises an LED driving module, wherein the LED driving module is connected with the driving voltage point; the LED driving module comprises an LED driving IC, an MOS tube and at least 2 LED lamps; the input end of the LED drive IC is connected with a drive voltage point, the output end of the LED drive IC is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected with the LED lamp and controls the MOS tube to open and close the LED lamp through the LED drive IC, and the source electrode of the MOS tube is grounded; the LED driving IC is of the type ORG 5811.

The LED driving module is connected to the driving voltage point (the driving module can be connected to the specific driving module according to actual needs), so that in the circuit, when the linear four-section divider resistor generates heat and the output module has no output voltage due to burnout of the divider resistor or other reasons in the power-on process, the LED driving IC in the LED driving module can be normally powered on to enable the LED lamp (for example, more than 18V/60 mA) to normally emit light and be powered on for illumination.

The utility model has the advantages that:

compared with the prior art, the utility model provides a multivoltage output circuit with from heat production function, this circuit is simple, safe, can export different voltages to utilize self loss and the heat that produces as the output heat source of external equipment, and can carry out the heat transfer effect by the insertion fin on the resistive element.

In addition, in the process of voltage drop, the four-section divider resistor of the circuit utilizes the heat generated by self loss as an output heat source of external equipment to dry and dehumidify the external equipment and convey hot air, so that the external equipment using the driving circuit can be normally used at low temperature (such as deep sea), and can drive an LED light source with certain power (for example, more than 18V/60 mA) to carry out energization illumination.

Drawings

Fig. 1 is a schematic circuit diagram of a multi-voltage output circuit with self-heating function implemented by the present invention.

Fig. 2 is a schematic circuit diagram of an LED driving module in a multi-voltage output circuit with self-heating function implemented by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical scheme of the utility model as follows:

as shown in fig. 1-2, the multi-voltage output circuit with self-heating function of the present invention includes an ac input line for ac input, a protection module, a rectification module capable of converting ac into dc, and a heat generation output module; the protection module is connected with the alternating current input line, and is connected with alternating current through the alternating current input line to enter the protection module, and the output end of the protection module is connected with the input end of the rectification module; the heat production output module comprises at least 1 divider resistor, the divider resistor is connected with the output end of the rectification module, the divider resistor generates heat in the voltage reduction process to supply to external equipment, and at least 1 output voltage point is led out after the voltage reduction process is finished; and a driving voltage point DB + is also directly led out from the output end of the rectification module.

In the utility model, the alternating current is input into the circuit through the alternating current input line, and in order to protect the circuit, a protection module is needed to be arranged, so that the circuit is prevented from being damaged by the mixed destructive impurity current or voltage in the alternating current entering the circuit, and the safety and reliability performance of the circuit is improved; the rectifier module converts the obtained alternating current into required direct current, a driving voltage point DB + can be led out from the output end of the rectifier module, and the rectifier module can also be connected with a heat-generating output module, so that the circuit can be output in two paths, one path can be directly output to be used as driving voltage for required components, the other path can be used for leading out an output voltage point to be output to required loads after the voltage drop process of a plurality of voltage-dividing resistors, in addition, in the voltage drop process, the voltage-dividing resistors can lose themselves to generate heat to be used as heat output sources of external equipment, and usually, heat radiating fins can be clamped on the voltage-dividing resistor body to conduct heat transmission in; wherein the current of the output voltage point depends on the size of the load. In addition, the circuit comprises an alternating current input line for inputting alternating current, a protection module, a rectifying module capable of converting the alternating current into direct current and a heat generation output module, and the circuit is simple in structure and capable of achieving required functions.

In this embodiment, the ac input line includes an ac neutral line ACN and an ac live line ACL, and the protection module includes a first Y capacitor Y1A, a second Y capacitor Y1B, a switch L + - -L-, a first fuse F1, a second fuse F2, a first varistor Z1, and a second varistor Z2; one end of the first Y capacitor Y1A and one end of the second Y capacitor Y1B are both grounded, and the other end of the first Y capacitor YIA and the other end of the second Y capacitor Y1B are respectively connected with an ac live wire ACL and an ac neutral wire ACN; the other end of the first Y capacitor Y1A is further connected to the switch L + -L-, and electrically connects the first fuse F1 and the first Y capacitor Y1A when the switch L + -L-is closed; the second fuse F2 is connected to an AC live wire ACL, two ends of the first piezoresistor Z1 and the second piezoresistor Z2 are respectively connected with the AC neutral wire ACN and the AC live wire ACL, and the first piezoresistor Z1 and the second piezoresistor Z2 are positioned between the first fuse F1 and the second fuse F2; the protection module further comprises an X capacitor X1, two ends of the X capacitor X1 are respectively connected with an alternating current zero line ACN and an alternating current live line ACL, and the X capacitor X1 is further connected to the input end of the rectification module in parallel; the protection module can also comprise a winding resistor RX, the winding resistor RX is connected in parallel with two ends of the X capacitor X1, and the winding resistor RX is heat-resistant and low-noise, so that the safety performance of the circuit can be improved.

For safety, the first Y capacitor Y1A and the second Y capacitor Y1B are generally connected when an alternating current power supply is connected, the first Y capacitor Y1A and the second Y capacitor Y1B can enhance safety performance, and the first fuse F1, the second fuse F2, the first piezoresistor Z1, the second piezoresistor Z2 and the X capacitor X1 are all used for protecting a circuit, so that a destructive impurity current or voltage cannot damage a rectifying module after the alternating current power supply is connected, for example, when the alternating current power supply jumps or surges and is beyond a bearing range of the protecting module, the first fuse F1 or the second fuse F2 can be blown to isolate the input of the alternating current power supply, thereby protecting the rectifying module from being damaged; and because of the non-volt-ampere characteristic of the piezoresistor, the piezoresistor is designed in the protection module, and when the input alternating voltage rises suddenly, the resistance of the piezoresistor increases along with the increase of the input voltage for the protection circuit, so that the protection effect is achieved. In practice, a relay may be connected to the switch L + - -L-, and a first resistor R1 and a second resistor R2 may be connected to the ac line ACL and the ac neutral line ACN, in order to enhance the protection function of the protection module.

In the embodiment, the rectifying module comprises a rectifying IC DB1, an X capacitor X1 is connected in parallel to an input end of the rectifying IC DB1, an output end of the rectifying IC DB1 is connected with a voltage dividing resistor, and a driving voltage point DB + is further led out from an output end of the rectifying IC DB 1; the specific model of rectifying IC DB1 is GBU 410. The rectifying IC DB1 with the model number of GBU410 can convert alternating current into direct current, can continuously, stably and efficiently work, does not generate heat in the process of working for a long time, and has the characteristic of high voltage resistance.

In this embodiment, the circuit further includes a filter module, the filter module includes a filter capacitor C2, and the filter capacitor C2 is connected in parallel to the output terminal of the rectifier IC DB 1. Since a noise-free voltage cannot be obtained in practice in a hundred percent after the alternating current is converted into the direct current through the rectifying IC DB1, in order to remove noise as much as possible, the output end of the rectifying IC DB1 is connected with the filter capacitor C2.

In this embodiment, the voltage dividing resistor includes a first voltage dividing resistor R4, a second voltage dividing resistor R5, a third voltage dividing resistor R6 and a fourth voltage dividing resistor R7, an input end of the first voltage dividing resistor R4 is connected to an output end of the rectifying IC DB1, the first voltage dividing resistor R4, the second voltage dividing resistor R5, the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7 are sequentially connected in series, and a voltage-reducing self-heating process is performed; the rectifying IC DB1 outputs direct current which is subjected to voltage reduction through a first voltage-dividing resistor R4, a second voltage-dividing resistor R5, a third voltage-dividing resistor R6 and a fourth voltage-dividing resistor R7 in sequence, then an output voltage point is led out, and heat generated in the voltage reduction process is supplied to external equipment; the heat generation output module further comprises a voltage regulator tube D1, and a voltage regulator tube D1 is connected to the two ends of the fourth voltage-dividing resistor R7 in parallel.

In this embodiment, one end of the voltage regulator D1 is grounded, and the other end is connected to an output voltage point, and the output voltage point can be connected in parallel to the first capacitor C3 and the second capacitor C17 according to a grounding point, so as to filter out noise waves and the like which may rush from the grounding end, thereby avoiding adverse effects on the voltage of the output voltage point. The second capacitor C17 is an active capacitor.

The voltage dividing resistors comprise a first voltage dividing resistor R4, a second voltage dividing resistor R5, a third voltage dividing resistor R6 and a fourth voltage dividing resistor R7, in practice, the heat generation output module can be designed into four-section type voltage reduction to lead out an output voltage point, direct current voltage is output at the output voltage point, and the output current can be calculated through the first voltage dividing resistor R4, the second voltage dividing resistor R5, the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7 on the assumption that the voltage of the output voltage point is known.

In practice, when the high voltage direct current 311V is required to be dropped, the design requires 3A current output, the load carrying capability is provided, the voltage dividing resistor is a 5W carbon film or cement resistor, the first voltage dividing resistor R4, the second voltage dividing resistor R5, the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7 respectively have resistance values of 2.3 Ω, 1.7 Ω and 1 Ω, and according to the circuit schematic diagram 1, the voltage at the output voltage point is R7V (R4+ R5+ R6+ R7) × 311 ═ 47V, where the output voltage point is taken over the fourth voltage-dividing resistor R7, according to I²The calculated current I of 5W/R7 is 2.24A, and the trimming resistance value can be close to the design current demand value. The larger the current output is required by design, the smaller the resistance value of the divider resistor and the larger the resistor power are, and meanwhile, the larger the heat consumption of the resistor per se is.

The external equipment is dried, dehumidified and hot air is conveyed by using four sections of voltage reduction of the first voltage-dividing resistor R4, the second voltage-dividing resistor R5, the third voltage-dividing resistor R6 and the fourth voltage-dividing resistor R7, and heat generated by self loss in the voltage reduction process is used as an output heat source of the external equipment, so that the external equipment using the driving circuit can be normally used at low temperature (deep sea). The voltage dividing resistor can be a carbon film or a cement resistor. In practice, the fourth voltage dividing resistor R7 is usually grounded, and in order to avoid noise mixing during grounding, a plurality of capacitors are usually connected between the output voltage point and the ground point for filtering.

In this embodiment, the circuit further includes an LED driving module, and the LED driving module is connected to the driving voltage point DB +; the LED driving module comprises an LED driving IC U2, a MOS tube Q16 and at least 2 LED lamps; the input end of the LED drive IC U2 is connected with a drive voltage point DB +, the output end of the LED drive IC U2 is connected with the grid electrode of the MOS tube Q16, the drain electrode of the MOS tube Q16 is connected with the LED lamp and controls the MOS tube Q16 to open and close the LED lamp through the LED drive IC, and the source electrode of the MOS tube Q16 is grounded; the LED driver IC U2 is model ORG 5811.

The LED driving module is connected to the driving voltage point (the driving module can be connected to the specific driving module according to actual needs), so that in the circuit, when no output voltage exists in the heat generation output module due to burnout of the linear four-section divider resistor or other reasons in the power-on process, the LED driving ICU2 in the LED driving module can be normally powered on to enable the LED lamp (for example, more than 18V/60 mA) to normally emit light and be powered on for illumination.

The utility model has the advantages that:

compared with the prior art, the utility model provides a multivoltage output circuit with from heat production function, this circuit is simple, safe, can export different voltages to utilize self loss and the heat that produces as the output heat source of external equipment, and can carry out the heat transfer effect by the insertion fin on the resistive element.

In addition, in the process of voltage drop, the four-section divider resistor of the circuit utilizes the heat generated by self loss as an output heat source of external equipment to dry and dehumidify the external equipment and convey hot air, so that the external equipment using the driving circuit can be normally used at low temperature (such as deep sea), and can drive an LED light source with certain power (for example, more than 18V/60 mA) to carry out energization illumination.

The above description is intended to be illustrative of the present invention and is not intended to be limiting, and all such modifications, equivalents and improvements as fall within the spirit and scope of the invention are intended to be included therein.

Claims (10)

1. A multi-voltage output circuit with a self-heating function is characterized by comprising an alternating current input line for inputting alternating current, a protection module, a rectifying module capable of converting the alternating current into direct current and a heat generation output module; the protection module is connected with the alternating current input line and is connected with alternating current through the alternating current input line to enter the protection module, and the output end of the protection module is connected with the input end of the rectification module; the heat generation output module comprises at least 1 divider resistor, the divider resistor is connected with the output end of the rectification module, the divider resistor generates heat in the voltage reduction process and supplies the heat to external equipment, and at least 1 output voltage point is led out after the voltage reduction process is finished; and a driving voltage point is also directly led out from the output end of the rectifying module.

2. The multi-voltage output circuit with self-generating function of claim 1, wherein said ac input line comprises an ac neutral line and an ac line, said protection module comprises a first Y capacitor, a second Y capacitor, a switch, a first fuse, a second fuse, a first varistor and a second varistor; one end of the first Y capacitor and one end of the second Y capacitor are both grounded, and the other end of the first Y capacitor and the other end of the second Y capacitor are respectively connected with the alternating current live wire and the alternating current zero line; the other end of the first Y capacitor is also connected with the switch, and the first fuse and the first Y capacitor are electrically conducted when the switch is closed; the second fuse is connected to the alternating current live wire, two ends of the first voltage dependent resistor and two ends of the second voltage dependent resistor are respectively connected with the alternating current zero line and the alternating current live wire, and the first voltage dependent resistor and the second voltage dependent resistor are located between the first fuse and the second fuse; the protection module further comprises an X capacitor, two ends of the X capacitor are respectively connected with the alternating current zero line and the alternating current live line, and the X capacitor is further connected to the input end of the rectification module in parallel.

3. The multi-voltage output circuit with self-heating function as claimed in claim 2, wherein the rectifying module comprises a rectifying IC, the X capacitor is connected in parallel with an input terminal of the rectifying IC, an output terminal of the rectifying IC is connected with the voltage dividing resistor, and an output terminal of the rectifying IC further draws out a driving voltage point.

4. The multi-voltage output circuit with self-generating function as claimed in claim 3, wherein the specific model of said rectifying IC is GBU 410.

5. The multi-voltage output circuit with self-generating function as claimed in claim 3, further comprising a filter module including a filter capacitor, and said filter capacitor is connected in parallel to an output terminal of said rectifying IC.

6. The multi-voltage output circuit with self-heating function according to claim 3, wherein the voltage dividing resistors comprise a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor and a fourth voltage dividing resistor, an input terminal of the first voltage dividing resistor is connected with an output terminal of the rectifying IC, the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor are sequentially connected in series, and the step-down self-heating process is performed.

7. The multi-voltage output circuit with self-heating function according to claim 6, wherein the heat generating output module further comprises a voltage regulator tube connected in parallel across the fourth voltage dividing resistor.

8. The multi-voltage output circuit with self-generating function as claimed in claim 1, further comprising an LED driving module, said LED driving module being connected with said driving voltage point.

9. The multi-voltage output circuit with self-heating function according to claim 8, wherein the LED driving module includes an LED driving IC, a MOS transistor, and at least 2 LED lamps; the LED driving circuit comprises an LED driving IC, a grid electrode, an MOS tube, a driving voltage point, a grid electrode, a drain electrode, a source electrode and a drain electrode, wherein the input end of the LED driving IC is connected with the driving voltage point, the output end of the LED driving IC is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected with the LED lamp and controls the MOS tube to open and close the LED lamp through the LED driving.

10. The multi-voltage output circuit with self-generating function as claimed in claim 9, wherein the LED driving IC is of a type ORG 5811.

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