Power supply circuit, power supply method and heating equipment

Abstract

The embodiment of the invention provides a power supply circuit, a power supply method and heating equipment, and relates to the technical field of electronics, the power supply circuit comprises a rectifier module, at least one energy storage element, a control module and a load; one end of the rectifier module is connected with a power supply and converts alternating current output by the power supply into direct current, and the other end is connected in parallel with at least one energy storage element; the anode end of the energy storage element is connected with the anode end of the load through the control module, and the cathode end of the energy storage element is connected with the cathode end of the load; the leading-out end of the control module is connected with the signal source so as to control a circuit between the energy storage element and the load to be connected or disconnected under the control signal of the signal source, when the circuit is disconnected, the energy storage element stores electric energy transmitted by the power source, and when the circuit is connected, the energy storage element and the power source supply power to the load together so as to improve the power supply power of the power supply circuit. The size of heating equipment is reduced, and cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a power supply circuit, a power supply method and a heating device. Background Art

[0002] Electric soldering iron is an essential tool for electronic production and electrical appliance repair. Its main function is to solder components and wires with an electrically heated soldering iron tip. Hot air gun is a tool for soldering and removing components. It mainly uses the hot air blown out by the core of the heating resistor wire to solder or remove components.

[0003] In the related art, the power supply circuits of the soldering iron and the hot air gun are similar. The AC mains power is usually stepped down and rectified into DC power with a certain voltage required by the soldering iron and the hot air gun, and the power of the power supply circuit usually determines the heating power of the soldering iron and the hot air gun. Accordingly, the higher the heating temperature required by the soldering iron and the hot air gun, the greater the power of the power supply circuit of the soldering iron and the hot air gun. The greater the power of the power supply circuit, the greater the volume and weight it occupies. The larger the volume of the soldering iron and the hot air gun, the more inconvenient it is to use and carry, and the higher the cost of manufacturing and transporting the soldering iron and the hot air gun.

[0004] Therefore, it is now urgent to redesign a power supply circuit, a power supply method and a heating device, and overcome the above-mentioned defects. Summary of the invention

[0005] The embodiments of the present application provide a power supply circuit, a power supply method and a heating device, which are used to increase the power supply power of the power supply circuit, reduce the volume of the electric soldering iron and the hot air gun, and reduce the manufacturing and transportation costs of the electric soldering iron and the hot air gun.

[0006] In a first aspect, an embodiment of the present application provides a power supply circuit, including a rectifier module, at least one energy storage element, a control module and a load;

[0007] One end of the rectifier module is connected to a power source to convert the AC power output by the power source into DC power, and the other end is connected in parallel to the at least one energy storage element;

[0008] The positive terminal of the energy storage element is connected to the positive terminal of the load through the control module, and the negative terminal of the energy storage element is connected to the negative terminal of the load;

[0009] The lead-out end of the control module is connected to a signal source to control the conduction or disconnection of the circuit between the energy storage element and the load under the control signal of the signal source. When the circuit is disconnected, the energy storage element stores the electric energy transmitted by the power supply. When the circuit is connected, the energy storage element and the power supply together supply power to the load.

[0010] Optionally, the load is a heating element.

[0011] Optionally, the energy storage element is a capacitor, and the capacity of the capacitor is greater than 3300uf.

[0012] Optionally, the control module includes a PMOS tube and an NMOS tube;

[0013] The PMOS tube is connected in series between the positive terminal of the energy storage element and the positive terminal of the load, and the gate of the PMOS tube is connected to the drain of the NMOS tube;

[0014] The gate of the NMOS tube is connected to the signal source, and the source is grounded.

[0015] Optionally, the source of the PMOS tube is connected to the negative terminal of the first voltage regulator tube, and the drain is connected to the positive terminal of the first voltage regulator tube;

[0016] The drain of the NMOS tube is connected to the negative terminal of the second voltage regulator tube, and the source is connected to the positive terminal of the second voltage regulator tube.

[0017] Optionally, the control signal is a PWM signal.

[0018] Optionally, a switching power supply is provided in the rectifier module;

[0019] One end of the switching power supply is connected to the power supply to convert the alternating current output by the power supply into direct current, and the other end is connected in parallel with the at least one energy storage element.

[0020] Optionally, the rectifier module is provided with a transformer and a rectifier bridge connected in series;

[0021] One end of the transformer is connected to the power supply, and the other end is connected to the AC end of the rectifier bridge to convert the AC power output by the power supply into DC power;

[0022] The DC end of the rectifier bridge is connected to the positive terminal of each energy storage element, and the negative terminal of each energy storage element is connected to the negative terminal of the transformer.

[0023] In a second aspect, an embodiment of the present application provides a power supply method, including:

[0024] The AC power output by the power supply is converted into DC power through a rectifier module;

[0025] The circuit between the energy storage element and the load is controlled to be turned on or off by a control signal output by a signal source, so that when the circuit is disconnected, the energy storage element stores the electric energy transmitted by the power supply, and when the circuit is turned on, the energy storage element and the power supply together supply power to the load.

[0026] In a third aspect, an embodiment of the present application provides a heating device, wherein the heating device includes a power supply circuit as described in any one of the first aspects.

[0027] The beneficial effects of this application are as follows:

[0028] A power supply circuit provided by an embodiment of the present application, a rectifier module and at least one energy storage element are arranged between a power supply and a load to convert the alternating current of the power supply into direct current, and the rectifier module is connected in parallel with the energy storage element, and the energy storage element can be used for energy storage and energy supply to increase the power supply power of the power supply circuit. A control module is arranged between the positive line of the energy storage element and the load to control the on-off of the lines of the power supply, the rectifier module and the energy storage element and the load line through a control signal. Accordingly, when the control line is disconnected, the electric energy provided by the power supply is rectified by the rectifier module and stored in the energy storage element. When the control line is turned on, the electric energy provided by the power supply is provided to the load through the rectifier module. At the same time, the electric energy stored in the energy storage element when the line is disconnected is also provided to the load. In this way, the two electric energy sources of the power supply and the energy storage element are used for power supply, and even a power supply circuit with a smaller volume and weight can still provide a large power supply power.

[0029] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a power supply method according to an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the structure of a control module provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a power supply circuit using a switching power supply provided in an embodiment of the present application;

[0035] Figure 5A schematic diagram of the structure of another power supply circuit using a switching power supply provided in an embodiment of the present application;

[0036] Figure 6 A schematic diagram of a power supply circuit using a transformer provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the structure of another power supply circuit using a transformer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0039] It should be noted that in the description of the present application, "at least one" refers to one or more, wherein a plurality refers to two or more. In view of this, in the embodiments of the present invention, "a plurality" may also be understood as "at least two". In addition, it should be understood that in the description of the present application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0040] It should be pointed out that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components, such as A and B connection, or A and C direct connection, C and B direct connection, and A and B are connected through C. In some scenarios, "connection" can also be understood as coupling, such as electromagnetic coupling between two inductors. In short, the connection between A and B enables the transmission of electrical energy between A and B.

[0041] There are two commonly used power supply schemes for electric soldering irons and hot air guns at present. One is to use a transformer and a rectifier bridge to convert AC mains power into low-voltage DC to power the heating core for heating, and the other is to use a switching power supply to convert AC mains power into low-voltage DC to power the heating core for heating. In these two methods, the power of the transformer and the switching power supply determines the heating power of the electric soldering iron and the hot air gun. Accordingly, if a high-power electric soldering iron and hot air gun are manufactured, a high-power transformer or switching power supply needs to be set in the power supply circuit of the electric soldering iron and the hot air gun. In this way, the finished electric soldering iron and hot air gun are relatively heavy and large in size, and the manufacturing and transportation costs are high.

[0042] In view of this, a power supply circuit provided by an embodiment of the present application includes a rectifier module, at least one energy storage element, a control module and a load; the rectifier module is respectively connected to a power supply and at least one energy storage element, and is connected in parallel with the energy storage element, and the control module is connected in series on the positive line connecting the energy storage element and the load, and a signal source is connected through the lead-out end of the control module, and the on-off of the positive line between the energy storage element and the load is controlled based on the control signal of the signal source, so that when the circuit is disconnected, the energy storage element stores the electric energy transmitted by the power supply, and when the circuit is turned on, the energy storage element and the power supply together supply power to the load, thereby increasing the power supply power of the power supply circuit without increasing the volume of the power supply circuit. Among them, the volume of the energy storage element is very small, such as a capacitor.

[0043] The following briefly introduces the application scenarios to which the technical solutions of the embodiments of the present application can be applied. It should be noted that the application scenarios introduced below are only used to illustrate the embodiments of the present application and are not limited. In the specific implementation process, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

[0044] The solution provided in the embodiments of the present application can be applied to most application scenarios of power supply circuits. For example, the power supply circuit provided in the embodiments of the present application can be applied to DC power supply equipment, electric soldering irons, hot air guns, hot air furnaces, heating equipment, refrigerators, etc. There is no restriction on the specific types of equipment to which the power supply circuit of the present application is applied, and they will not be listed one by one here.

[0045] The power supply circuit provided by the exemplary embodiment of the present application is described below in combination with the application scenarios described above with reference to the accompanying drawings. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of the present application, and the implementation of the present application is not limited in this regard.

[0046] See also Figure 1 , which is a schematic diagram of a power supply circuit provided in an embodiment of the present application, wherein the power supply circuit includes a rectifier module 102, at least one energy storage element 103, a control module 104 and a load 105;

[0047] One end of the rectifier module 102 is connected to the power supply 101 to convert the AC power output by the power supply 101 into DC power, and the other end is connected in parallel with at least one energy storage element 103;

[0048] The positive terminal of the energy storage element 103 is connected to the positive terminal of the load 105 through the control module 104, and the negative terminal of the energy storage element 103 is connected to the negative terminal of the load 105;

[0049] The lead end of the control module 104 is connected to the signal source 106 to control the circuit between the energy storage element 103 and the load 106 to be turned on or off under the control signal of the signal source 106. When the circuit is disconnected, the energy storage element 103 stores the electric energy transmitted by the power supply 101. When the circuit is turned on, the energy storage element 103 and the power supply 101 together supply power to the load 105.

[0050] Based on the above Figure 1 The power supply circuit in the present application provides a power supply method, such as Figure 2 As shown, including:

[0051] Step 201: converting the AC power output by the power supply 101 into DC power through the rectifier module 102;

[0052] Step 202, control the circuit between the energy storage element 103 and the load 105 to be turned on or off through the control signal output by the signal source 106, so that when the circuit is disconnected, the energy storage element 103 stores the electric energy transmitted by the power supply 101, and when the circuit is turned on, the energy storage element 103 and the power supply 101 together supply power to the load 105.

[0053] That is to say, in the above power supply circuit and power supply method, two power sources, namely a power supply and an energy storage element, can be used for power supply, so that even a power supply circuit with a small size and weight can still provide a large power supply power.

[0054] In one embodiment, the load 105 is a heating element, such as a heating wire, a thermistor, a conductive coating, an electric heating film, etc. There is no specific limitation on the heating element here, and it is set according to the specific equipment using the power supply circuit of this application.

[0055] In one embodiment, the energy storage element 103 is a capacitor, and the capacity of the capacitor is greater than 3300uf. In this way, the selection of a large-capacity capacitor is different from a general rectifier smoothing capacitor, and the capacitance is much larger than the smoothing capacitor, and is used as energy storage discharge in this power supply circuit. At the moment when a heating device (such as an electric soldering iron, a hot air gun, etc.) is heated, the current is relatively large, and the output voltage of the transformer and the switching power supply will be pulled down. At this time, the capacitor discharges the stored electricity, which increases the discharge current and improves the heating power.

[0056] In one embodiment, at least one energy storage element may be 3, 4, or 5 capacitors connected in parallel. There is no specific limitation on the number of energy storage elements, which can be set as needed.

[0057] Based on the above Figure 1 The power supply circuit in the present application provides a control module, such as Figure 3 As shown, the control module includes a PMOS tube Q1 and an NMOS tube Q2;

[0058] The PMOS tube Q1 is connected in series between the positive terminal of the energy storage element and the positive terminal of the load, and the gate G of the PMOS tube Q1 is connected to the drain D of the NMOS tube Q2; the gate G of the NMOS tube Q2 is connected to the signal source, and the source S is grounded.

[0059] Based on the above Figure 3 The control module provided in the embodiment of the present application also includes a first voltage regulator tube and a second voltage regulator tube, the source S of the PMOS tube Q1 is connected to the negative terminal of the first voltage regulator tube, and the drain D is connected to the positive terminal of the first voltage regulator tube; the drain D of the NMOS tube Q2 is connected to the negative terminal of the second voltage regulator tube, and the source S is connected to the positive terminal of the second voltage regulator tube.

[0060] In one embodiment, a first resistor R1 is connected between the source S of the PMOS tube Q1 and the drain D of the NMOS tube Q2; the first resistor R1 is used for voltage division; a second resistor R2 is connected between the signal source and the gate G of the NMOS tube Q2 to protect the signal source and the NMOS tube Q2, and the gate G of the NMOS tube Q2 is grounded through a third resistor R3, and the third resistor R3 is used to control current.

[0061] In one embodiment, the control signal output by the signal source is a PWM signal.

[0062] In one embodiment, the signal source may be a device such as a microprocessor or a controller that can generate a control signal, and the specific configuration of the signal source is not limited herein.

[0063] Based on the above Figure 1 and Figure 3 The power supply circuit in, and related embodiments thereof, the present application embodiment provides a power supply circuit, such as Figure 4 As shown, a switching power supply 402 is provided in the rectifier module;

[0064] One end of the switching power supply 402 is connected to the power supply 401 to convert the AC power output by the power supply 401 into DC power, and the other end is connected in parallel with at least one energy storage element 403. In this way, the control module 404 controls the connection and disconnection between the energy storage element 403 and the load 405 based on the control signal output by the signal source 406.

[0065] In one embodiment, if Figure 5 As shown, an embodiment of the present application provides a power supply circuit, wherein three capacitors are provided as energy storage elements, namely C1, C2, and C3, the capacitance value of each capacitor is 4700uf, and the capacitor models used by C1, C2, and C3 are C95, C96, and C12, respectively, the resistance value of R1 is 10K, the resistance value of R2 is 100K, and the resistance value of R3 is 10K. Q1 can use a PMOS tube device with model AOD409, and Q2 can use an NMOS tube device with model 2N7002.

[0066] The power supply circuit of the above embodiment can improve the power supply, specifically: a large-capacity energy storage element (energy storage capacitor or super capacitor, etc., the capacitance capacity far exceeds the capacitance capacity required for rectification and smoothing) is connected in parallel on the DC output power supply bus side of the switching power supply, and the capacitance capacity can be determined according to the heating power demand. In theory, the larger the capacitance capacity, the better the effect. The control signal of the heating device (electric soldering iron and hot air gun) using eddy current heating can be a PWM pulse signal. When the machine is turned on, the switching power supply output first fully charges the capacitor. When the electric soldering iron or hot air gun needs to heat up, the output PWM pulse signal controls the PMOS tube and the NMOS tube to turn on, and the heating core-heating coil-heating element is powered on for heating. When the PWM signal is high, the PMOS tube and the NMOS tube are turned on, and the switching power supply and the capacitor are simultaneously powered on for the heating coil of the heating core of the electric soldering iron and the hot air gun. When the PWM signal is low, the PMOS tube is turned off, and the switching power supply is charging the capacitor to store energy. When the next PWM is high, the PMOS tube is turned on, and the switching power supply and the capacitor are again powered on for the heating core to heat up. In this way, when working, the total heating power supply is the switching power supply power plus the capacitor discharge power, which increases the heating power supply of the electric soldering iron and hot air gun as a whole. Properly adjusting the frequency and duty cycle of PWM, and selecting a large-capacity capacitor or super capacitor (above 3300uf) with appropriate capacity can effectively increase the heating power of the electric soldering iron and hot air gun by more than 1 times, while avoiding the overload output of the power module and increasing reliability. Therefore, under the same performance specification requirements, the actual power of the power module required is reduced, effectively reducing the volume, weight, product cost, transportation, and packaging material costs of the equipment itself.

[0067] Based on the above Figure 1 and Figure 3 The power supply circuit in, and related embodiments thereof, the present application embodiment provides a power supply circuit, such as Figure 6 As shown, a transformer and a rectifier bridge connected in series are provided in the rectifier module 602; one end of the transformer is connected to the power supply 601, and the other end is connected to the AC end of the rectifier bridge to convert the AC power output by the power supply into DC power; the DC end of the rectifier bridge is connected to the positive end of each energy storage element 603, and the negative end of each energy storage element 603 is connected to the negative end of the transformer.

[0068] In one embodiment, if Figure 7 As shown, an embodiment of the present application provides a power supply circuit, wherein a rectifier module includes a transformer and a rectifier bridge L1, the transformer may be a step-down transformer, the rectifier bridge may adopt a rectifier bridge of model MB40M, and the energy storage element is provided with three capacitors, namely C1, C2, and C3, each of which has a capacitance value of 4700uf, and the capacitor models adopted by C1, C2, and C3 are C95, C96, and C12, respectively, the resistance value of R1 is 10K, the resistance value of R2 is 100K, and the resistance value of R3 is 10K, Q1 may adopt a PMOS tube device of model AOD409, and Q2 may adopt an NMOS tube device of model 2N7002.

[0069] The power supply circuit of the above embodiment can improve the power supply power, and the principle is the same as the above Figure 4 and Figure 5 The principle of increasing power in the power supply circuit is the same, that is, a large-capacity energy storage capacitor or super capacitor is connected to the DC output power supply bus side of the rectifier bridge connected to the transformer. The control signal of the electric soldering iron and hot air gun using eddy current heating is a PWM pulse signal. When the machine is turned on, the transformer output first fully charges the capacitor. When the electric soldering iron or hot air gun needs to heat up, the output PWM pulse signal controls the MOS tube to turn on, and the heating coil of the heating core is powered for heating. When the PWM signal is high, the MOS tube is turned on, and the transformer and the capacitor are powered at the same time. When the PWM signal is low, the MOS tube is turned off. At this time, the transformer charges the capacitor to store energy. When the next PWM is high, the MOS tube is turned on, and the transformer and the capacitor are heated again for the heating core at the same time, increasing the power supply. Appropriately adjusting the frequency and duty cycle of PWM, and selecting a large-capacity capacitor or super capacitor with appropriate capacity (above 3300uf), can effectively increase the heating power of the electric soldering iron and hot air gun by more than 1 times, while avoiding the overload output of the transformer and increasing reliability. Therefore, under the same performance specification requirements, the actual required transformer power is reduced, effectively reducing the volume, weight, product cost, transportation and packaging material costs of the equipment itself.

[0070] Based on the above, the power supply circuit provided in the present application can increase the heating power supply power of the soldering iron and the hot air gun without increasing the transformer power and the switching power supply module power.

[0071] In one embodiment, the electric soldering iron and hot air gun maintenance tools are electric soldering irons or hot air guns that use the eddy current heating principle. The heating temperature of the heating core can be controlled based on the control module to provide different PWM pulse signal duty ratios to achieve the purpose of constant temperature heating.

[0072] Compared with the related technologies of power supply circuits, the technical effects of the power multiplier circuit for high-frequency eddy current heating equipment of the present application include:

[0073] (1) High efficiency: The power generated by the capacitor’s charging and discharging mechanism is added to the power output, significantly improving the output power of the power supply circuit.

[0074] (2) Fast response: The optimized power supply circuit design can obtain the transient output superposition power of the power supply circuit (energy storage element power, transformer power or switching power supply power), which can quickly respond to high power demands and is suitable for dynamic load changes.

[0075] (3) Energy saving: The energy storage element has high efficiency in energy storage and release and low loss. Even with a smaller power transformer, the same power output requirement can be achieved.

[0076] (4) Flexible application: The power increase mechanism can be widely used in situations requiring high-power pulses or rapid charging and discharging.

[0077] (5) Cost savings: While ensuring the same power output, the system reduces reliance on traditional power supply circuits, reduces energy consumption and operating costs; achieves lightweight design, uses smaller low-power transformers and power modules, and makes transportation and deployment more efficient, reducing costs.

[0078] Based on the above Figure 1 , Figure 3-7 The power supply circuit and its embodiment in the present application embodiment improves a heating device, which may include the above-mentioned Figure 1 , Figure 3-7 Any power supply circuit in.

[0079] Those skilled in the art will understand that Figure 1 , Figure 3-7 The power supply circuit does not constitute a limitation on the circuit, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components. It can be understood that based on the circuit design concept of this application, circuits obtained by copying or deforming the circuit should all be within the scope of protection of this application.

Claims

1. A power supply circuit, characterized in that: It includes a rectifier module, at least one energy storage element, a control module and a load; One end of the rectifier module is connected to a power source to convert the AC power output by the power source into DC power, and the other end is connected in parallel to the at least one energy storage element; The positive terminal of the energy storage element is connected to the positive terminal of the load through the control module, and the negative terminal of the energy storage element is connected to the negative terminal of the load; The lead-out end of the control module is connected to a signal source to control the conduction or disconnection of the circuit between the energy storage element and the load under the control signal of the signal source. When the circuit is disconnected, the energy storage element stores the electric energy transmitted by the power supply. When the circuit is connected, the energy storage element and the power supply together supply power to the load.

2. The power supply circuit according to claim 1, characterized in that: The load is a heating element.

3. The power supply circuit according to claim 1, characterized in that: The energy storage element is a capacitor, and the capacity of the capacitor is greater than 3300uf.

4. The power supply circuit according to claim 1, characterized in that: The control module includes a PMOS tube and an NMOS tube; The PMOS tube is connected in series between the positive terminal of the energy storage element and the positive terminal of the load, and the gate of the PMOS tube is connected to the drain of the NMOS tube; The gate of the NMOS tube is connected to the signal source, and the source is grounded.

5. The power supply circuit according to claim 4, characterized in that: The source of the PMOS tube is connected to the negative terminal of the first voltage regulator tube, and the drain is connected to the positive terminal of the first voltage regulator tube; The drain of the NMOS tube is connected to the negative terminal of the second voltage regulator tube, and the source is connected to the positive terminal of the second voltage regulator tube.

6. The power supply circuit according to claim 1, characterized in that: The control signal is a PWM signal.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that: The rectifier module is provided with a switching power supply; One end of the switching power supply is connected to the power supply to convert the alternating current output by the power supply into direct current, and the other end is connected in parallel with the at least one energy storage element.

8. The power supply circuit according to any one of claims 1 to 6, characterized in that: The rectifier module is provided with a transformer and a rectifier bridge connected in series; One end of the transformer is connected to the power supply, and the other end is connected to the AC end of the rectifier bridge to convert the AC power output by the power supply into DC power; The DC end of the rectifier bridge is connected to the positive terminal of each energy storage element, and the negative terminal of each energy storage element is connected to the negative terminal of the transformer.

9. A power supply method, characterized in that: include: The AC power output by the power supply is converted into DC power through a rectifier module; The circuit between the energy storage element and the load is controlled to be turned on or off by a control signal output by a signal source, so that when the circuit is disconnected, the energy storage element stores the electric energy transmitted by the power supply, and when the circuit is turned on, the energy storage element and the power supply together supply power to the load.

10. A heating device, characterized in that: The heating device comprises a power supply circuit as claimed in any one of claims 1 to 8.

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