Portable energy-saving power supply and operation control method thereof

Abstract

The invention provides a portable energy-saving power supply and an operation control method thereof. The purposes of energy conservation, environmental protection and noise reduction of portable energy-saving power supply equipment are achieved. The internal combustion engine is coaxially connected with the permanent magnet synchronous generator, the generator is dragged to output three-phase alternating current, the three-phase alternating current is converted into direct-current voltage through the rectifying and filtering module, and stable voltage output is achieved. According to the power output load capacity, the microprocessor chip controls the stepping motor to achieve opening and closing and opening degree control of an accelerator and a choke valve, so that rotation speed control of an internal combustion engine and rotation speed control of a generator are achieved, and stable output of appropriate voltage and power is achieved. When the output voltage meets the requirement, the rechargeable storage battery is cut off through the relay, and the DC-DC power supply module is used for supplying power, so that the electric energy consumption of the rechargeable storage battery is reduced. If the voltage of the rechargeable storage battery is detected to be insufficient during the power supply period of the generator, the output circuit of the generator can be switched to be connected to the battery charging circuit, so that automatic charging of the rechargeable storage battery is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of energy-saving power supplies, and in particular relates to a portable energy-saving power supply and an operation control method thereof. Background Art

[0002] At present, there are many types of field power supply equipment, most of which realize power supply function through internal combustion engines or batteries.

[0003] The power supply equipment based on internal combustion engine outputs three-phase AC voltage by driving the generator, and then outputs DC voltage after rectification by the rectifier circuit for users to use. This kind of power supply equipment is large in size, high in noise, inconvenient to carry and has extremely low utilization rate. The service life of portable power supply based on battery depends on the battery life. The battery is heavy and large in size. In addition, discarded batteries are hazardous waste, with high recycling costs and pose a huge challenge to environmental protection.

[0004] In addition, the outdoor environment is usually harsh. Whether traveling alone or in a group, the portability of the power supply is very important. At the same time, the power supply must also take into account its practicality, durability, environmental protection and other functions required for outdoor travel. Therefore, outdoor power supplies that are suitable for a wide range of people and have few restrictions on use conditions have received widespread attention in the industry. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of current outdoor power supplies and to provide a portable energy-saving power supply and its operation control method, which is suitable for use in harsh outdoor environments and aims to generate electricity according to load demand, thereby achieving the effects of saving energy, reducing noise and reducing carbon dioxide emissions.

[0006] In order to achieve the above-mentioned invention object, the specific technical solution provided by the present invention is:

[0007] A portable energy-saving power supply, which is special in that it includes an outer shell, a microprocessor control board located in the outer shell, an internal combustion engine, a permanent magnet synchronous generator, a rectifier filter module, a DC-DC power supply module and a rechargeable battery;

[0008] The microprocessor control board integrates a microprocessor chip, and an internal combustion engine control interface circuit, a power switching circuit and a battery charging circuit, a multi-signal acquisition and protection circuit, a fault alarm circuit, a DC / DC power supply voltage acquisition circuit, and a battery voltage acquisition circuit electrically connected thereto;

[0009] The outer shell is provided with a control panel electrically connected to the microprocessor chip; the control panel is provided with a first switch integrated with "start / run / stop", a second switch integrated with "start / stop", a power supply waterproof aviation plug, a fault indicator light and a power supply working indicator light; the first switch and the second switch are both waterproof boat-shaped switches, and can be distinguished by different colors;

[0010] The internal combustion engine is coaxially connected to the permanent magnet synchronous generator, and is used to drive the permanent magnet synchronous generator to operate so that it can output three-phase alternating current to the outside; wherein the pull rope of the recoil starter in the internal combustion engine extends out of the outer shell;

[0011] The rectifier and filter module is used to convert the three-phase alternating current output by the permanent magnet synchronous generator into direct current over a wide range;

[0012] The DC-DC power supply module is used to stabilize the wide range of direct current output by the rectifier and filter module within the 18-32V voltage range required by the load;

[0013] The rechargeable battery is used to store electrical energy and provide initial electrical energy to the microprocessor control board;

[0014] The "start" in the first switch is used to connect the rechargeable battery and the microprocessor control board, the "run" is used to connect the DC-DC power module and the power supply waterproof aviation plug, and the "stop" is used to disconnect the DC-DC power module and the power supply waterproof aviation plug;

[0015] The two flameout control lines of the internal combustion engine are electrically connected to the second switch through the internal combustion engine control interface circuit; pressing the second switch can realize "starting" to disconnect the two flameout control lines, and "stopping" to short-circuit the two flameout control lines; when the internal combustion engine is in the "starting" state, the permanent magnet synchronous generator is started to operate by manually pulling the pull rope of the recoil starter; when the internal combustion engine is in the "stopping" state, the permanent magnet synchronous generator is turned off and stops operating;

[0016] The microprocessor chip collects the output current of the DC-DC power module, the temperature of the internal combustion engine housing, the load working current and the output voltage of the permanent magnet synchronous generator in real time through the multi-signal collection and protection circuit, and monitors the working state of the portable energy-saving power supply; when the value collected by any signal exceeds the corresponding threshold, it outputs a high level, and the output signal outputs a low level through the NOR gate, and the normally closed relay circuit cuts off the power output of the control panel to perform over-current, over-temperature and over-voltage protection;

[0017] The microprocessor chip controls the power-on of the fault indicator light through the fault alarm circuit according to the overcurrent, overtemperature and / or overvoltage signal;

[0018] The microprocessor chip adjusts the opening angle of the throttle of the internal combustion engine through the first stepper motor driving circuit and the first stepper motor according to the magnitude of the output current of the DC-DC power supply module;

[0019] The microprocessor chip adjusts the opening angle of the initial choke of the internal combustion engine through the second stepper motor driving circuit and the second stepper motor according to the initial temperature of the internal combustion engine housing;

[0020] The microprocessor chip collects the voltage of the rechargeable battery and the output voltage of the DC-DC power module through the battery voltage collection circuit and the DC / DC power supply voltage collection circuit respectively, and reasonably utilizes the rechargeable battery through the power switching circuit and the battery charging circuit according to the size of the output voltage of the DC-DC power module.

[0021] Furthermore, the microprocessor control board also integrates a generator speed collection circuit electrically connected to the microprocessor chip; the microprocessor chip timely adjusts the opening angles of the throttle and choke of the internal combustion engine according to the collected permanent magnet synchronous generator speed.

[0022] Furthermore, in order to prevent the internal combustion engine from running out of fuel and not being refilled, the portable energy-saving power source can still be used, and also includes a DC motor;

[0023] The DC motor is powered by a rechargeable battery or an external power source (such as external available clean energy), and its output shaft is connected to the permanent magnet synchronous generator. The DC motor function application requires manual connection to an external clean energy power supply device or a battery power supply, which is independent of the internal combustion engine working circuit.

[0024] Furthermore, in order to make the warning more obvious when used in the field, three sets of buzzers with different frequencies are included;

[0025] The microprocessor chip controls the alarm buzzer to sound through the fault alarm circuit. Three groups of buzzers with different frequencies respectively warn of over-current faults, over-temperature faults and over-voltage faults. The frequencies of the three groups of alarm buzzers can be set to different frequencies so that users can quickly identify what kind of fault has occurred in an environment with poor lighting.

[0026] Furthermore, the power supply waterproof aviation plug includes two sets of 4-core waterproof aviation plugs and two sets of USB3.0 waterproof aviation plugs;

[0027] The fault indicator lights are three groups of LED warning lights with different flashing frequencies, which respectively warn of overcurrent faults, overtemperature faults and overvoltage faults; the flashing frequencies of the three groups of LED lights can be set to different frequencies, so that users can quickly identify what kind of fault has occurred in a noisy environment;

[0028] The power working indicator light is a group of LED lights that are always on when powered on.

[0029] Furthermore, the first stepper motor is connected to the throttle of the micro internal combustion engine through a throttle interface tooling;

[0030] The second stepper motor is connected to the choke of the micro internal combustion engine through a choke interface tooling.

[0031] Furthermore, the internal combustion engine is a micro internal combustion engine;

[0032] The permanent magnet synchronous generator adopts a high power density permanent magnet synchronous generator.

[0033] At the same time, the present invention also provides an operation control method of the portable energy-saving power supply, which is special in that it includes the following steps:

[0034] 1) Start-up phase

[0035] Press the second switch "Power On" button and the first switch "Start" button of the control panel in sequence, and the rechargeable battery provides initial power to the microprocessor control board. At this time, the microprocessor chip collects the temperature of the internal combustion engine casing in real time through the multi-signal acquisition and protection circuit, and adjusts the opening angle of the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor according to the temperature of the internal combustion engine casing;

[0036] 2) Warm-up phase

[0037] Manually pull the pull rope of the recoil starter in the internal combustion engine to ignite, start the internal combustion engine and make it run at idle speed, the temperature of the internal combustion engine casing gradually increases until the temperature of the internal combustion engine casing is greater than its minimum operating temperature, and the microprocessor chip fully opens the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor. At this time, the internal combustion engine works normally and is in the lowest no-load idle working state until the internal combustion engine reaches the normal operating temperature and the warm-up work is completed;

[0038] 3) Operation phase (power output and engine speed control)

[0039] 3.1) Press the "Run" button of the first switch on the control panel to switch to the DC-DC power module to power the microprocessor control panel. At this time, the power working indicator light is on, indicating that the output of the high power density permanent magnet synchronous generator is normal; at the same time, the microprocessor chip also needs to obtain the temperature of the internal combustion engine casing in real time through the multi-signal acquisition and protection circuit to determine whether it is greater than or equal to the threshold. If so, it is overtemperature, the microprocessor chip cuts off the power output, and controls the fault indicator light to power on through the fault alarm circuit;

[0040] 3.2) The microprocessor chip obtains the output current of the DC-DC power module and the output voltage of the permanent magnet synchronous generator in real time through the multi-signal acquisition and protection circuit, and determines whether the output current of the DC-DC power module, the output voltage of the permanent magnet synchronous generator, and the speed of the permanent magnet synchronous generator calculated by the output voltage of the permanent magnet synchronous generator are all normal; if normal, the load is turned on, and the microprocessor chip controls the opening angle of the micro internal combustion engine throttle through the first stepper motor drive circuit and the first stepper motor according to the size of the output current of the DC-DC power module, so that the speed of the internal combustion engine is maintained at the speed value corresponding to the output current of the DC-DC power module. At this time, the permanent magnet synchronous generator works to meet the output power and is in the lowest power consumption state; otherwise, the microprocessor chip cuts off the power output and controls the fault indicator light to power on through the fault alarm circuit;

[0041] During this process, as long as the microprocessor control board is powered on, the temperature, voltage, and current are always monitored. Once an abnormality occurs, the power will be cut off, which is highly safe.

[0042] 4) Flame-out stage

[0043] Determine whether the portable energy-saving power supply needs to stop working; if the load power consumption ends, the internal combustion engine continues to maintain normal idling operation; first press the "stop" button of the first switch on the control panel to disconnect the DC-DC power supply module and the waterproof power supply plug, close the battery normally closed relay, start the external battery power supply, and the microprocessor chip closes the choke of the internal combustion engine through the second stepper motor drive circuit and the second stepper motor to prepare for the next working cycle; then press the "stop" button of the second switch to cut off the ignition switch of the internal combustion engine, the internal combustion engine is turned off, and the portable energy-saving power supply ends; otherwise, return to step 3.2) to continue using electricity until the load power consumption ends.

[0044] Furthermore, when the fault indicator light is powered on, the alarm is also powered on and sounds.

[0045] The principle of the present invention is:

[0046] The present invention provides a portable energy-saving power supply and an operation control method thereof, which provide technical guarantee for the safe and reliable application of power supply equipment in outdoor environments without power systems; the design concept of the power supply provides a design idea and a design method for the energy-saving, safe and reliable design of conventional power supply equipment based on internal combustion engine power generation; the alarm mechanism of the power supply equipment provides an implementation method for the alarm mechanism of conventional electronic equipment, and the core of the design is to ensure that the output is normal while achieving the purpose of energy saving, environmental protection and noise reduction, and the key to the design lies in taking into account five major functions: stable voltage output, accurate speed acquisition, timely throttle adjustment, reasonable opening and closing of the damper, and reasonable energy switching.

[0047] The specific design principles are as follows:

[0048] First, the engine damper control at the initial start

[0049] The core innovation of this portable energy-saving power supply implementation method is to use a microprocessor chip to control the opening and closing degree of the internal combustion engine throttle according to the load demand power, so that the internal combustion engine can run constantly at the speed required by the permanent magnet synchronous generator, which not only ensures the load power consumption, but also saves energy and reduces noise; because the DC-DC power supply module ensures that the output voltage is stable in the range of 18-32V, the opening and closing degree of the throttle can be determined according to the size of the load demand power. Here, mainly based on the output characteristics of the internal combustion engine body, the output characteristics of the permanent magnet synchronous generator and the output characteristics of the DC-DC power supply module, the mathematical relationship between the output current of the DC-DC power supply module and the opening and closing degree of the internal combustion engine throttle is fitted, so that the throttle opening and closing degree can be adjusted according to the output current of the DC-DC power supply module (also called the load demand power or output power).

[0050] Second, energy-saving and environmentally friendly power switching function

[0051] In order to control the opening and closing degree of the throttle at the initial start of the internal combustion engine, a rechargeable battery is designed in the portable energy-saving power supply. In order to extend the service life of the rechargeable battery, reduce the recycling and processing cost, and uphold the concept of environmental protection, a power switching circuit and a battery charging circuit are designed inside the portable energy-saving power supply, which solves the power supply problem of the microprocessor control board of the portable energy-saving power supply, and also realizes the demand of charging the rechargeable battery with a generator in the later stage; the overall throttle opening and closing degree can be adjusted according to the actual load demand through the first stepper drive circuit and the first stepper motor, so as to realize the function of the permanent magnet synchronous generator supplying power according to the load demand;

[0052] Third, portable energy-saving power supply is safe and reliable

[0053] The microprocessor chip collects the output current of the DC-DC power module, the casing temperature (temperature rise) of the internal combustion engine (or engine), the speed of the permanent magnet synchronous generator or the output voltage of the DC-DC power supply in real time; if the output current of the DC-DC power module is greater than the design threshold or design percentage of the rated current, the overcurrent fault indicator light is on, the alarm buzzer sounds, and the power output is cut off; if the casing temperature of the internal combustion engine is higher than the threshold, the overtemperature fault indicator light is on, the alarm buzzer sounds, and the power output is cut off; if the speed of the permanent magnet synchronous generator or the output voltage of the DC-DC power supply is higher than the threshold, the overvoltage fault indicator light is on, the alarm buzzer sounds, and the power output is cut off; the buzzer sounds in the three states can have different frequencies, and the flashing frequencies of the alarm indicator light can be different, so that users can quickly identify fault information.

[0054] Fourth, the power panel has a friendly interface and is easy to operate.

[0055] The control panel is equipped with multiple output interfaces, such as two 5V / 5A USB fast charging interfaces and two 24V / 20A (or 24V / 18A) high current output interfaces, which can be used to power mobile phones, laptops and other electrical equipment (such as lighting equipment); and the output interfaces are all waterproof interfaces, suitable for use in harsh environments such as the wild and outdoors without power supply. At the same time, the control panel is equipped with a waterproof boat-shaped switch for switching between start, stop, and run functions, and switching between power on and shutdown functions. The interface is simple, intuitive and easy to operate. The outer shell of the power supply is based on the structure of the micro internal combustion engine and the portability requirements, and the outer contour is a backpack structure, suitable for carrying in a special backpack or an ordinary backpack.

[0056] The advantages of the present invention are:

[0057] This portable energy-saving power supply system is based on the optimal energy-saving design concept and the safest and most reliable design idea. Its advantages are mainly reflected in four aspects:

[0058] 1. Low-power startup

[0059] In the initial stage of starting, conventional internal combustion engines generally do not detect temperature. Instead, they directly close the choke and open the throttle to start the engine using high-power density fuel, which consumes a lot of fuel and causes serious pollution emissions. The portable energy-saving power supply is equipped with a rechargeable battery or a clean energy (such as a solar cell) input interface, and adds a power switching circuit and a battery charging circuit. During the startup phase, the battery can supply power to the microprocessor control board and the microprocessor chip can detect the starting ambient temperature of the internal combustion engine, confirm the opening state and degree of the choke, and control the degree of throttle opening, so that the internal combustion engine can complete the startup work under appropriate fuel consumption conditions.

[0060] 2. Energy-saving operation

[0061] In the past, the internal combustion engine directly operated at the maximum idle speed and output power state, or manually adjusted the throttle opening and closing according to the load operation conditions; the portable energy-saving power supply runs through the energy-saving and environmentally friendly design concept throughout the entire control process, which is not only reflected in the high power density permanent magnet synchronous generator, throttle control, choke control, power switching circuit and battery charging switching circuit and other structures, but also in the control concept. Use load feedback for closed-loop regulation, that is, real-time acquisition of DC-DC power module output current, internal combustion engine housing temperature and permanent magnet synchronous generator output voltage (generator speed), according to the load demand power control internal combustion engine choke, throttle opening and closing size, so that the internal combustion engine outputs the appropriate speed to drive the generator to output the appropriate power generation, to achieve the purpose of noise reduction and emission reduction, that is to say, the internal combustion engine is always in a constant power working mode according to the load condition, to achieve power generation according to load demand, to achieve the effect of saving energy, reducing noise and reducing carbon dioxide emissions.

[0062] 3. Security Application

[0063] The portable energy-saving power supply collects and monitors the operating temperature of the internal combustion engine, the output current of the DC-DC power module, the output voltage and output speed of the permanent magnet synchronous generator in real time. If over-temperature, over-current, over-voltage or over-speed occurs, the microprocessor chip automatically switches the power output by controlling the relay circuit, cuts off the load power supply, and puts the engine in the lowest idle state. At the same time, it is equipped with over-temperature, over-current, over-voltage (over-speed) alarms. Different alarm states use alarm prompt sounds and alarm flashing lights of different frequencies, which can ensure timely and accurate identification of alarm states in different usage environments, ensuring that the power supply works in a safe and monitorable state.

[0064] 4. Intelligent control circuit

[0065] According to actual application requirements, the normally open relay and normally closed relay are controlled to automatically switch the power supply status of the internal microprocessor control board to reduce the energy consumption of the rechargeable battery. According to the power load condition and power protection mechanism, the output status of the DC-DC power module is automatically switched and early warning prompts are issued to achieve the purpose of energy saving, emission reduction and safe and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a block diagram of the working principle of the portable energy-saving power supply of the present invention;

[0067] Figure 2 This is a block diagram of the power supply and switching circuit principle of the battery and generator in the portable energy-saving power supply of the present invention;

[0068] Figure 3 It is the overall principle block diagram of the portable energy-saving power supply of the present invention;

[0069] Figure 4 This is a control flow chart of the portable energy-saving power supply of the present invention. DETAILED DESCRIPTION

[0070] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0071] like Figure 1-3 As shown, a portable energy-saving power supply includes an outer shell, a microprocessor control board located in the outer shell, an internal combustion engine, a permanent magnet synchronous generator, a rectifier filter module, a DC-DC power supply module and a rechargeable battery. According to the maximum output power of the power supply, a suitable micro internal combustion engine and a small-volume high-power density permanent magnet synchronous generator can be selected, so that the power supply can be reduced in size and weight.

[0072] The microprocessor control board integrates a microprocessor chip, and an internal combustion engine control interface circuit electrically connected thereto, a power switching circuit and a battery charging circuit, (internal combustion engine housing temperature, generator output voltage, DC / DC output load current) multi-signal acquisition and protection circuit, a fault alarm circuit, a DC / DC power supply voltage acquisition circuit, a battery voltage acquisition circuit, and a generator speed acquisition circuit.

[0073] The outer shell is provided with a control panel electrically connected to the microprocessor chip; the control panel is provided with a first switch integrated with "start / run / stop", a second switch integrated with "power on / off", a power supply waterproof aviation plug, a fault indicator light and a power supply working indicator light. Among them, the power supply waterproof aviation plug includes two groups of 4-core waterproof aviation plugs and two groups of USB3.0 waterproof aviation plugs; the fault indicator light is three groups of power-on flashing LED lights, which respectively warn of over-current faults, over-temperature faults and over-voltage faults. The flashing frequencies of the three groups of LED lights can be set to different frequencies, so that users can quickly identify what kind of fault has occurred; the buzzer is three groups of power-on alarm buzzers, which respectively warn of over-current faults, over-temperature faults and over-voltage faults. The frequencies of the three groups of alarm buzzers can be set to different frequencies, so that users can quickly identify what kind of fault has occurred; the power supply working indicator light is a group of power-on LED lights that are always on. The first switch and the second switch are both waterproof boat-type switches, and can be distinguished by different colors. Pressing "Start" in the first switch is used to connect the rechargeable battery and the microprocessor control board, "Run" is used to connect the DC-DC power module and the power supply waterproof aviation plug, and "Stop" is used to disconnect the DC-DC power module and the power supply waterproof aviation plug.

[0074] The internal combustion engine is a power device that directly converts the heat energy released by the combustion of internal fuel into power. It is coaxially connected to a high-power-density permanent-magnet synchronous generator, and the pull rope of the recoil starter in the micro internal combustion engine extends out of the outer shell.

[0075] The high power density permanent magnet synchronous generator is driven by a micro internal combustion engine to run continuously, using the magnetic field to convert energy, realizing the conversion of mechanical energy into electrical energy, and outputting three-phase alternating current to the outside.

[0076] The rectifier and filter module is used to convert the three-phase alternating current output by the permanent magnet synchronous generator into a wide range of direct current; in this embodiment, the rectifier and filter module is composed of a rectifier circuit and a filter circuit, including six groups of high-voltage and high-current rectifier diodes, inductors, and capacitors, which convert the three-phase alternating current output by the permanent magnet synchronous generator into direct current.

[0077] The DC-DC power supply module is used to stabilize the wide range of direct current output by the rectifier and filter module within the 18-32V voltage range required by the load; the DC-DC power supply module integrates an input filter circuit, a boost circuit, a buck circuit and an output filter circuit, and its input is the output voltage of the rectifier and filter module. In this embodiment, its output is 1 24V, 1 20V and 2 5V (24V voltage is used for equipment power supply, and the end of the 20V voltage output cable is connected to the USB interface for charging work equipment such as laptops and industrial control books, and two 5V channels are used for USB3.0 interfaces to charge users' mobile phones and other devices). Through the internal boost circuit and buck circuit, when the high power density permanent magnet synchronous generator outputs a certain wide range of voltage, the DC-DC power supply module can stably output a DC voltage of 18-32V to meet the load requirements.

[0078] The rechargeable battery is used to store electrical energy and provide initial electrical energy for the microprocessor control board (that is, to power the microprocessor control board before the internal combustion engine works). In this way, the temperature of the micro internal combustion engine casing can be collected before the micro internal combustion engine and the high power density permanent magnet synchronous generator work. The microprocessor chip determines whether the micro internal combustion engine choke is open or closed and the opening angle according to the temperature, ensuring that the micro internal combustion engine is started in the most energy-saving, environmentally friendly and noise-reducing state; and the use of rechargeable batteries can also realize battery reuse, reduce the amount of waste batteries generated, and achieve energy-saving and environmental protection results.

[0079] The circuit functions integrated in the microprocessor control board are mainly as follows:

[0080] ①Internal combustion engine control interface circuit

[0081] The two flameout control lines of the internal combustion engine are electrically connected to the second switch through the circuit; pressing the second switch can realize "starting" to disconnect the two flameout control lines and "stopping" to short-circuit the two flameout control lines; when the internal combustion engine is in the "starting" state, the permanent magnet synchronous generator is started to operate by manually pulling the pull rope of the recoil starter; and when the internal combustion engine is in the "stopping" state, the permanent magnet synchronous generator is shut down and stops running. Of course, in order to avoid the internal combustion engine from actively shutting down (for example: in the event of damage or lack of fuel), a DC motor is also installed inside the portable energy-saving power supply. The DC motor is powered by a rechargeable battery or an external power supply (such as externally available clean energy), and its output shaft is connected to the permanent magnet synchronous generator, which can also drive the permanent magnet synchronous generator to operate continuously.

[0082] ②Multi-signal acquisition and protection circuit

[0083] The microprocessor chip collects the output current of the DC-DC power module, the temperature of the internal combustion engine housing and the output voltage of the permanent magnet synchronous generator in real time through a multi-signal acquisition and protection circuit, so as to realize the protection and safe use of the portable energy-saving power supply; wherein, the temperature acquisition of the internal combustion engine can adopt an integrated chip, a PT100 resistor, a Huygens bridge or a rail-to-rail operational amplifier to realize the conversion of the temperature signal into a voltage signal, which is input to the AD input terminal of the microprocessor chip; the output voltage detection of the permanent magnet synchronous generator, the voltage output from the rectifier and filter module is divided by a resistor, and then filtered by a first-level follower, and then input to the AD input terminal of the microprocessor chip; the output current (i.e., the load current) of the DC-DC power module can be collected by a current sensor or a current sampling resistor method, which can be realized by selecting a 20A current sensor plus a first-level follower circuit in this embodiment. The temperature, voltage and current signals obtained by the acquisition and conditioning circuit are outputted by the comparator respectively. When the value collected by any signal exceeds the corresponding threshold, a high level is outputted, and the output signal is outputted at a low level through the NOR gate, controlling the MOSFET power switch tube (or the normally closed relay that can handle large current) to disconnect, cut off the power output of the control panel, and perform over-temperature, over-voltage and over-current protection.

[0084] ③Fault alarm circuit

[0085] In this embodiment, the portable power supply also includes an alarm buzzer. The microprocessor chip controls the fault indicator light and the alarm buzzer to power on through the fault alarm circuit according to the overcurrent, overtemperature and / or overvoltage signals; the overcurrent, overtemperature and overvoltage comparison signals also control three NPN transistors respectively at the same time, and the NPN transistors are respectively connected in series with the fault indicator light and the buzzer. When a fault occurs, the fault indicator light flashes and the alarm buzzer sounds. The three fault indicator lights have different colors, different flashing frequencies, and different buzzer frequencies, which facilitates timely and accurate identification of the cause of the fault.

[0086] ④Generator speed acquisition circuit

[0087] In view of the working characteristics of the permanent magnet synchronous generator, its speed and output voltage have a certain proportional relationship. In order to detect its output voltage more accurately and control the noise of the power supply, the portable energy-saving power supply collects the generator speed signal and integrates the generator speed acquisition circuit on the microprocessor control board. First, the three-phase AC signal output by the permanent magnet synchronous generator is isolated and converted to a square wave signal through an optocoupler isolation circuit (this circuit not only plays a role in signal isolation, but also plays a zero-crossing comparison function, which can convert the AC signal output by the permanent magnet synchronous generator into a square wave signal to realize the generator speed acquisition). The sine wave signal is converted into a square wave signal and converted into a 5V level signal. Secondly, the 5V signal is converted to 3.3V through a level conversion chip, and finally input to the CAP signal capture end (level signal capture end) of the microprocessor chip. The microprocessor chip realizes square wave signal frequency detection through a period detection method or a pulse counting method, thereby realizing generator speed detection, and adjusting the opening angle of the throttle and choke of the internal combustion engine in real time in combination with the detection results to achieve energy saving and noise reduction.

[0088] ⑤Power switching circuit and battery charging circuit

[0089] The microprocessor chip collects the voltage of the rechargeable battery and the output voltage of the DC-DC power module through the battery voltage collection circuit and the DC / DC power supply voltage collection circuit respectively, and reasonably utilizes the rechargeable battery through the power supply switching circuit and the battery charging circuit according to the output voltage of the DC-DC power module;

[0090] The power switching circuit and the battery charging circuit are connected through the battery output interface, the DC-DC power module output interface, the first switch integrated with "start / run / stop", the PNP power tube, the NPN power tube, the microprocessor IO control interface and the microprocessor control board power interface. Among them, the battery output interface is connected in series with the PNP power tube and then connected to the 24V power input end of the microprocessor control board, the DC-DC power module output interface is connected in series with the NPN power tube and then connected to the 24V power input end of the microprocessor control board, and a set of switch signals of the first switch are connected in series to the 24V power supply circuit of the microprocessor control board;

[0091] When the first switch is in the "start" state, the switch is closed, the rechargeable battery is connected, and the microprocessor control board is powered. At this time, the PNP power tube control signal terminal IO1 defaults to a low level, the PNP transistor is in the on state, and the NPN power tube control signal terminal IO2 defaults to a low level, and the NPN power tube is in the off state. When the battery voltage drops below 18V, the NPN power tube control terminal IO2 gives a high-level control signal to connect the NPN power tube, so that the DC-DC power module output interface is connected to the battery output interface, and the charging circuit is connected. When the output voltage of the DC-DC power module is around 24V and the rechargeable battery voltage is greater than 18V, a high level is given to the PNP power tube control signal terminal IO1. At this time, the rechargeable battery is disconnected from the microprocessor control board, and the microprocessor control board switches to be powered by the DC-DC power module.

[0092] ⑥Throttle control circuit and choke control circuit

[0093] The microprocessor chip adjusts the opening angle of the throttle of the internal combustion engine through the first stepper motor drive circuit and the first stepper motor according to the output current of the DC-DC power supply module. This is the throttle control circuit. The first stepper motor is connected to the throttle of the internal combustion engine through the throttle interface tooling. The IO interface of the microprocessor chip realizes the control signal output and level conversion. The first stepper motor drive circuit is composed of a Darlington array circuit, which increases the driving ability of the first stepper motor control signal and realizes the driving of the first stepper motor to achieve the purpose of controlling the opening and closing of the throttle of the internal combustion engine and the size of the opening angle.

[0094] The microprocessor chip adjusts the opening angle of the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor according to the temperature of the internal combustion engine casing. This is the choke control circuit. The second stepper motor is connected to the choke of the internal combustion engine through the choke interface tooling. The microprocessor chip IO interface realizes control signal output and level conversion. The second stepper motor drive circuit is composed of a Darlington array circuit, which increases the driving ability of the second stepper motor control signal and realizes the driving of the second stepper motor to achieve the purpose of controlling the opening and closing of the internal combustion engine choke and the size of the opening angle.

[0095] Since there are various methods for realizing the above circuit functions, they are not limited to the method provided in this embodiment. As long as the corresponding purpose can be achieved, other mature methods can be used.

[0096] In short, the implementation principle of portable energy-saving power supply is:

[0097] The internal combustion engine is coaxially connected to the permanent magnet synchronous generator. The internal combustion engine drives the generator to output three-phase AC power, which is converted into DC voltage through the rectification and filtering module to achieve stable voltage output;

[0098] According to the output load capacity of the power supply, the microprocessor chip controls the first stepper motor and the second stepper motor to realize the opening and closing of the throttle and the choke and the control of the opening angle, thereby realizing the internal combustion engine speed control and the generator speed control, and realizing the stable output of appropriate voltage and power; when the output voltage reaches the requirement, the rechargeable battery is cut off by the relay and the DC-DC power supply module (i.e., the generator power supply) is used for power supply, thereby reducing the power consumption of the rechargeable battery.

[0099] If it is detected that the voltage of the rechargeable battery is insufficient during the period of power supply by the generator, the generator output circuit can also be switched to connect to the battery charging circuit to realize automatic charging of the rechargeable battery.

[0100] In order to realize energy saving, environmental protection and noise reduction of the portable energy-saving power supply device of the present invention, the hardware design includes a rechargeable battery, a power switching circuit and a battery charging circuit, and a multi-signal acquisition and protection circuit. The rechargeable battery enables the microprocessor to collect the temperature of the internal combustion engine casing in advance, so as to confirm the opening and closing degree of the internal combustion engine choke (in the default closed state, it consumes a lot of oil and causes great pollution), so as to achieve the purpose of energy saving and environmental protection. The design of the multi-signal acquisition and protection circuit enables the portable energy-saving power supply to determine the opening and closing degree of the internal combustion engine throttle according to the load output current characteristics, so that the internal combustion engine can work under the premise of ensuring appropriate output power, achieving low fuel consumption, reduced speed and noise reduction. In the flameout stage, press the "stop" button to connect the internal combustion engine flameout line, the internal combustion engine is turned off, and the power supply work ends.

[0101] like Figure 4 As shown, the design core of the portable energy-saving power supply is to ensure energy saving, environmental protection and noise reduction under normal output conditions. The specific operation control method includes the following steps:

[0102] 1) Start-up phase

[0103] Press the first switch "start" button and the second switch "power on" button on the control panel, and the rechargeable battery provides initial power to the microprocessor control board. At this time, the microprocessor chip starts to work, and the temperature of the internal combustion engine housing is collected in real time through the multi-signal acquisition and protection circuit. According to the temperature of the internal combustion engine housing, it is determined whether the choke needs to be opened (the default is closed), and the opening angle of the internal combustion engine choke is adjusted through the second stepper motor drive circuit and the second stepper motor.

[0104] 2) Warm-up phase

[0105] Manually pull the pull rope of the recoil starter in the internal combustion engine to start the internal combustion engine and make it run at idle speed. The temperature of the internal combustion engine casing gradually increases until the temperature of the internal combustion engine casing is greater than its minimum operating temperature (determined according to the model). The microprocessor chip fully opens the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor. At this time, the internal combustion engine works normally and is in the lowest no-load idle working state until the internal combustion engine reaches the normal operating temperature (determined according to the model), and the warm-up work is completed;

[0106] 3) Operation phase (power output and engine speed control)

[0107] 3.1) Press the "Run" button of the first switch on the control panel to switch to the DC-DC power supply module to power the microprocessor control panel (i.e., the generator power output relay is turned on). At this time, the power working indicator light is on, indicating that the output of the high power density permanent magnet synchronous generator is normal; at the same time, the microprocessor chip also needs to obtain the temperature of the internal combustion engine casing in real time through the multi-signal acquisition and protection circuit to determine whether it is greater than or equal to the threshold. If so, it is overtemperature, the microprocessor chip cuts off the power output, and controls the fault indicator light to power on through the fault alarm circuit;

[0108] 3.2) The microprocessor chip collects the output current of the DC-DC power module and the output voltage of the permanent magnet synchronous generator in real time through the multi-signal acquisition and protection circuit, and determines whether the output current of the DC-DC power module, the output voltage of the permanent magnet synchronous generator and the speed of the permanent magnet synchronous generator are all normal; if normal, the load is turned on, and the microprocessor chip controls the opening and closing degree of the micro internal combustion engine throttle through the first stepper motor drive circuit and the first stepper motor according to the size of the output current of the DC-DC power module, so that the speed of the internal combustion engine is maintained at the speed value corresponding to the output current of the DC-DC power module. At this time, the permanent magnet synchronous generator works to meet the output power and is in the lowest power consumption state (such as no load is connected, the detection current is zero, and the internal combustion engine maintains normal idling operation); otherwise, the microprocessor chip cuts off the power output, and controls the fault indicator light and the alarm buzzer to power on through the fault alarm circuit;

[0109] 4) Flame-out stage

[0110] Determine whether the portable energy-saving power supply needs to stop working; if the load power consumption ends, the internal combustion engine continues to maintain normal idling operation; first press the "stop" button of the first switch on the control panel to disconnect the DC-DC power supply module and the power supply waterproof aviation plug, close the battery normally closed relay, start the external battery power supply, and the microprocessor chip closes the choke of the internal combustion engine through the second stepper motor drive circuit and the second stepper motor to prepare for the next working cycle; then press the "stop" button of the second switch to cut off the ignition switch of the internal combustion engine, the internal combustion engine is turned off, and the portable energy-saving power supply ends; otherwise, continue to use electricity until the load power consumption ends.

[0111] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A portable energy-saving power supply, characterized in that: It includes an outer shell, a microprocessor control board located in the outer shell, an internal combustion engine, a permanent magnet synchronous generator, a rectifier filter module, a DC-DC power supply module and a rechargeable battery; The microprocessor control board integrates a microprocessor chip, and an internal combustion engine control interface circuit, a power switching circuit and a battery charging circuit, a multi-signal acquisition and protection circuit, a fault alarm circuit, a DC / DC power supply voltage acquisition circuit, and a battery voltage acquisition circuit electrically connected thereto; The outer shell is provided with a control panel electrically connected to the microprocessor chip; the control panel is provided with a first switch integrated with "start / run / stop", a second switch integrated with "start / stop", a power supply waterproof aviation plug, a fault indicator light and a power supply working indicator light; The internal combustion engine is coaxially connected to the permanent magnet synchronous generator, and is used to drive the permanent magnet synchronous generator to operate so that it can output three-phase alternating current to the outside; wherein the pull rope of the recoil starter in the internal combustion engine extends out of the outer shell; The rectifier and filter module is used to convert the three-phase alternating current output by the permanent magnet synchronous generator into direct current over a wide range; The DC-DC power supply module is used to stabilize the wide range of direct current output by the rectifier and filter module within the 18-32V voltage range required by the load; The rechargeable battery is used to store electrical energy and provide initial electrical energy to the microprocessor control board; The "start" in the first switch is used to connect the rechargeable battery and the microprocessor control board, the "run" is used to connect the DC-DC power module and the power supply waterproof aviation plug, and the "stop" is used to disconnect the DC-DC power module and the power supply waterproof aviation plug; The two flameout control lines of the internal combustion engine are electrically connected to the second switch through the internal combustion engine control interface circuit; pressing the second switch can realize "starting" to disconnect the two flameout control lines, and "stopping" to short-circuit the two flameout control lines; when the internal combustion engine is in the "starting" state, the permanent magnet synchronous generator is started to operate by manually pulling the pull rope of the recoil starter; when the internal combustion engine is in the "stopping" state, the permanent magnet synchronous generator is turned off and stops operating; The microprocessor chip obtains the output current of the DC-DC power module, the temperature of the internal combustion engine housing, the load working current and the output voltage of the permanent magnet synchronous generator in real time through the multi-signal acquisition and protection circuit, and monitors the working state of the portable energy-saving power supply; when the value of any signal acquisition exceeds the corresponding threshold, it outputs a high level, and the output signal outputs a low level through the NOR gate, and the normally closed relay circuit cuts off the power output of the control panel to perform over-current, over-temperature and over-voltage protection; The microprocessor chip controls the power-on of the fault indicator light through the fault alarm circuit according to the overcurrent, overtemperature and / or overvoltage signal; The microprocessor chip adjusts the opening angle of the throttle of the internal combustion engine through the first stepper motor driving circuit and the first stepper motor according to the magnitude of the output current of the DC-DC power supply module; The microprocessor chip adjusts the opening angle of the choke of the internal combustion engine through the second stepper motor driving circuit and the second stepper motor according to the initial temperature of the internal combustion engine housing; The microprocessor chip collects the voltage of the rechargeable battery and the output voltage of the DC-DC power module through the battery voltage collection circuit and the DC / DC power supply voltage collection circuit respectively, and reasonably utilizes the rechargeable battery through the power switching circuit and the battery charging circuit according to the size of the output voltage of the DC-DC power module.

2. The portable energy-saving power supply according to claim 1, characterized in that: The microprocessor control board also integrates a generator speed acquisition circuit electrically connected to the microprocessor chip; the microprocessor chip timely adjusts the opening angle of the internal combustion engine throttle according to the acquired permanent magnet synchronous generator speed.

3. The portable energy-saving power supply according to claim 1 or 2, characterized in that: It also includes DC motors; The DC motor is powered by a rechargeable battery or an external power source, and its output shaft is connected to the permanent magnet synchronous generator.

4. The portable energy-saving power supply according to claim 3, characterized in that: Also included are three sets of buzzers with different frequencies; The microprocessor chip controls the buzzer to sound through the fault alarm circuit.

5. The portable energy-saving power supply according to claim 4, characterized in that: The power supply waterproof aviation plug includes two sets of 4-core waterproof aviation plugs and two sets of USB3.0 waterproof aviation plugs; The fault indicator lights are three groups of LED alarm lights with different flash frequencies, which respectively warn of over-current faults, over-temperature faults and over-voltage faults; The power working indicator light is a group of LED lights that are always on when powered on.

6. The portable energy-saving power supply according to claim 5, characterized in that: The first stepper motor is connected to the throttle of the micro internal combustion engine through a throttle interface tooling; The second stepper motor is connected to the choke of the micro internal combustion engine through a choke interface tooling.

7. The portable energy-saving power supply according to claim 6, characterized in that: The internal combustion engine is a micro internal combustion engine; The permanent magnet synchronous generator adopts a high power density permanent magnet synchronous generator.

8. The operation control method of the portable energy-saving power supply according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Start-up phase Press the second switch "Power On" button and the first switch "Start" button of the control panel in sequence, and the rechargeable battery provides initial power to the microprocessor control panel. At this time, the microprocessor chip collects the temperature of the internal combustion engine casing in real time through the multi-signal acquisition and protection circuit, and adjusts the opening angle of the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor according to the temperature of the internal combustion engine casing; 2) Warm-up phase Manually pull the pull rope of the recoil starter in the internal combustion engine to start the internal combustion engine and make it run at idle speed. The temperature of the internal combustion engine casing gradually increases until the temperature of the internal combustion engine casing is greater than its minimum operating temperature. The microprocessor chip fully opens the internal combustion engine choke through the second stepper motor drive circuit and the second stepper motor. At this time, the internal combustion engine works normally and is in the lowest no-load idle working state until the internal combustion engine reaches the normal operating temperature and the warm-up work is completed; 3) Operation phase 3.1) Press the "Run" button on the first switch of the control panel to switch to the DC-DC power module to power the microprocessor control panel. At this time, the power working indicator light is on, indicating that the output of the high power density permanent magnet synchronous generator is normal; at the same time, the microprocessor chip also needs to obtain the temperature of the internal combustion engine casing in real time through the multi-signal acquisition and protection circuit to determine whether it is greater than or equal to the threshold. If so, it is overtemperature, the microprocessor chip cuts off the power output, and controls the fault indicator light to power on through the fault alarm circuit; 3.2) The microprocessor chip obtains the output current of the DC-DC power module and the output voltage of the permanent magnet synchronous generator in real time through the multi-signal acquisition and protection circuit, and determines whether the output current of the DC-DC power module, the output voltage of the permanent magnet synchronous generator, and the speed of the permanent magnet synchronous generator calculated by the output voltage of the permanent magnet synchronous generator are all normal; if normal, the load is turned on, and the microprocessor chip controls the opening angle of the micro internal combustion engine throttle through the first stepper motor drive circuit and the first stepper motor according to the size of the output current of the DC-DC power module, so that the speed of the internal combustion engine is maintained at the speed value corresponding to the output current of the DC-DC power module. At this time, the permanent magnet synchronous generator works to meet the output power and is in the lowest power consumption state; otherwise, the microprocessor chip cuts off the power output and controls the fault indicator light to power on through the fault alarm circuit; 4) Flame-out stage Determine whether the portable energy-saving power supply needs to stop working; if the load power consumption ends, the internal combustion engine continues to maintain normal idling operation. At this time, first press the first switch "Stop" button on the control panel, and then press the second switch "Stop" button, and the portable energy-saving power supply will stop working; otherwise, return to step 3.2) to continue using electricity until the load power consumption ends.

9. The operation control method according to claim 8, characterized in that: When the fault indicator light is powered on, the alarm is also powered on and sounds.

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