Portable energy storage power supply capable of being used for equipment with intermittent working function

Abstract

The utility model discloses a portable energy storage power supply capable of being used for equipment with an intermittent working function. A pre-stage circuit of the portable energy storage power supply comprises a current detection resistor loop and a differential amplification circuit, the current detection resistor loop is connected with the negative electrode of the battery pack, and the output voltage and current signals are transmitted to the MCU after being filtered by the differential amplification circuit and the current and voltage signals in sequence; a full-wave rectification circuit of the post-stage circuit is connected to a secondary side of the transformer; the output alternating current passes through a high-low voltage isolation current detection circuit, and a detected current value signal is transmitted to a voltage feedback loop for signal processing; the current subjected to filtering and signal attenuation processing of the voltage feedback loop is transmitted to the MCU after passing through the voltage follower circuit; and the MCU sends a driving signal to the pre-stage or post-stage driving circuit based on a preset algorithm so as to control whether the power supply is in a sleep mode or not. According to the utility model, when power is supplied to intermittent electric equipment, the sleep mode of the intermittent electric equipment can be automatically switched to the non-sleep mode.

Description

Technical Field

[0001] The utility model relates to the technical field of portable energy storage power supply control, in particular to a portable energy storage power supply that can be used for equipment with intermittent working functions. Background Art

[0002] With the rapid development of electronic products, many electrical devices need to be powered by portable energy storage power supplies. Use portable energy storage power supplies to power electrical devices. When the electrical devices are working, the portable energy storage power supplies need to supply power normally; when the electrical devices are not working, the portable energy storage power supplies will automatically sleep after a certain period of time in order to reduce power consumption. However, some electrical equipment such as air compressors, air conditioners, and ventilators work intermittently. At this time, there is a problem: when the intermittently working equipment needs to start working, the portable energy storage power supply has automatically triggered the sleep function, that is, it is in a shutdown state, which will cause the intermittently working equipment to fail to work when it is running again because it cannot get normal power supply. Therefore, it is necessary to solve the problem that when the energy storage power supply is used to power intermittent electrical equipment, the portable energy storage power supply can automatically switch its sleep mode to a non-sleep state, that is, a standby state, so as to ensure that the intermittent electrical equipment can work normally. Utility Model Content

[0003] 1. Technical problems to be solved:

[0004] In response to the above technical problems, the utility model provides a portable energy storage power supply that can be used for equipment with intermittent working functions, so that when the energy storage power supply is used to power the intermittent power-consuming equipment, the portable energy storage power supply can automatically switch its sleep mode to a non-sleep state, thereby ensuring that the intermittent power-consuming equipment can work normally.

[0005] 2. Technical solution:

[0006] A portable energy storage power supply that can be used for equipment with intermittent working functions, which controls whether the portable energy storage power supply turns off the sleep function through an inverter circuit connected thereto, characterized in that: the inverter circuit includes a transformer front-stage circuit, a transformer, a transformer rear-stage circuit, an MCU with an integrated ADC signal acquisition function, a front-stage driving circuit, and a rear-stage driving circuit;

[0007] The front-stage circuit includes a current-sensing resistor loop and a differential amplifier circuit; the current-sensing resistor loop is connected to the negative electrode of the battery pack, and the output voltage and current signals are sequentially transmitted to the MCU after being processed by the differential amplifier circuit and the current and voltage signal filtering;

[0008] The post-stage circuit includes a full-wave rectifier circuit, a high-low voltage isolation current detection circuit, a voltage feedback loop, and a voltage follower circuit; the full-wave rectifier circuit is connected to the secondary side of the transformer, and the output AC power is transmitted to the voltage feedback loop for signal processing through the high-low voltage isolation current detection circuit; the current signal after filtering and signal attenuation processing of the voltage feedback loop is transmitted to the MCU after passing through the voltage follower circuit;

[0009] The MCU receives the voltage and current of the front and rear stages based on a preset algorithm and compares the cumulative value of the charge consumption of the front and rear stage circuits in a preset time period, and sends a drive signal to the front or rear stage drive circuit according to the comparison result to control whether the power supply is in sleep mode.

[0010] Furthermore, the current-sense resistor loop includes a current-sense resistor R1, MOS tubes Q1, Q2, and a capacitor C1; one end of the capacitor C1 is connected to the middle terminal of the primary side of the transformer, and the other end is grounded; the middle terminal of the primary side of the transformer is connected to the positive electrode of the battery; one terminal of the primary side of the transformer is connected to the D pole of the MOS tube Q1, and the S pole of the MOS tube Q1 is grounded; the other terminal of the primary side of the transformer is connected to the D pole of Q2, the S pole of D2 is connected to one end of the current-sense resistor R1, and the other end of the current-sense resistor R1 is grounded.

[0011] Furthermore, the differential amplifier circuit includes resistors R2, R3, R6, and an operational amplifier chip U2; one end of the resistors R2 and R3 are respectively connected to the two ends of R1, and the other ends are respectively connected to the out-of-phase and in-phase terminals of the operational amplifier chip U2; after the in-phase terminal of U2 is connected to the resistor R6, R6 is grounded; the in-phase terminal of U2 is connected to the resistor R4, and the other end of R4 is connected to the terminal of the MCU.

[0012] Furthermore, the full-wave rectifier circuit includes diodes D1, D2, D3, and D4; the full-wave rectifier circuit is connected to an H-bridge circuit composed of switch tubes Q3, Q4, Q5, and Q6; diodes D1 and D2 are connected in series with D3 and D4 in parallel, and the two ends of the parallel connection are respectively connected to the two ends of the secondary side of the transformer; the switch tubes Q3, Q4, Q5, and Q6 form an H-bridge circuit, which converts the high-voltage direct current of the full-wave rectifier circuit connected thereto into industrial frequency alternating current.

[0013] Furthermore, it also includes a voice recognition system; the voice recognition system recognizes voice instructions through a voice acquisition device and sends them to the MCU, and the MCU drives the front-stage driving circuit or the rear-stage driving circuit according to the instructions.

[0014] Furthermore, it also includes a button for controlling the opening and closing of automatic sleep; after the button transmits the corresponding I / O level signal to the MCU through the button circuit, the MCU realizes the control of opening and closing of automatic sleep.

[0015] Furthermore, it also includes a signal transmission module; after the signal transmission module transmits the received automatic sleep start and stop signal of the mobile phone to the MCU, the MCU realizes the control of the automatic sleep start and stop.

[0016] 3. Beneficial effects:

[0017] (1) The utility model is a portable energy storage power supply that can be used for equipment with intermittent working functions. The front-stage circuit and the rear-stage circuit are set to collect voltage and current signals between the primary side of the transformer and the energy storage battery, and between the secondary side of the transformer and the electrical equipment, and the power of the front-stage circuit and the rear-stage circuit is obtained according to the collected signals, so as to judge whether the user equipment in the circuit at this time is an intermittent working equipment. If it is an intermittent working equipment, a driving signal is sent to the rear-stage circuit, and the power supply supplies power to the electrical equipment.

[0018] (2) In order to realize the above process, the utility model adds a current detection circuit in the bridge boost circuit of the previous stage to send the detected information to the MCU in the circuit. The detection resistor R1 is generally selected in the level of several milliohms to tens of milliohms, and the power is in the range of several watts to tens of watts, so as to avoid the problem of large resistance value, which will cause much greater loss and low energy efficiency.

[0019] (3) At the same time, in order to achieve the above process, the utility model also provides a solution for turning on and off the automatic sleep function by voice control, button control, and mobile phone APP control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a block diagram of the front-stage circuit of the utility model;

[0021] Figure 2 This is a block diagram of the back-stage circuit of the utility model;

[0022] Figure 3 It is the overall circuit diagram of the front and rear pole circuits of the utility model;

[0023] Figure 4 is a flow chart in a specific embodiment;

[0024] Figure 5 is a block diagram of voice control in a specific embodiment;

[0025] Figure 6 is a block diagram of manual control in a specific embodiment;

[0026] Figure 7 It is a block diagram of mobile phone APP control in a specific embodiment. DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with the accompanying drawings.

[0028] As attached Figure 1 To Attachment Figure 3 As shown, a portable energy storage power supply that can be used for equipment with intermittent working functions, through an inverter circuit connected thereto, controls whether the portable energy storage power supply turns off the sleep function, characterized in that: the inverter circuit includes a transformer front-stage circuit, a transformer, a transformer rear-stage circuit, an MCU with an integrated ADC signal acquisition function, a front-stage driving circuit, and a rear-stage driving circuit;

[0029] The front-stage circuit includes a current-sensing resistor loop and a differential amplifier circuit; the current-sensing resistor loop is connected to the negative electrode of the battery pack, and the output voltage and current signals are sequentially transmitted to the MCU after being processed by the differential amplifier circuit and the current and voltage signal filtering;

[0030] The post-stage circuit includes a full-wave rectifier circuit, a high-low voltage isolation current detection circuit, a voltage feedback loop, and a voltage follower circuit; the full-wave rectifier circuit is connected to the secondary side of the transformer, and the output AC power is transmitted to the voltage feedback loop for signal processing through the high-low voltage isolation current detection circuit; the current signal after filtering and signal attenuation processing of the voltage feedback loop is transmitted to the MCU after passing through the voltage follower circuit;

[0031] The MCU receives the voltage and current of the front and rear stages based on a preset algorithm and compares the cumulative value of the charge consumption of the front and rear stage circuits in a preset time period, and sends a drive signal to the front or rear stage drive circuit according to the comparison result to control whether the power supply is in sleep mode.

[0032] Furthermore, the current-sense resistor loop includes a current-sense resistor R1, MOS tubes Q1, Q2, and a capacitor C1; one end of the capacitor C1 is connected to the middle terminal of the primary side of the transformer, and the other end is grounded; the middle terminal of the primary side of the transformer is connected to the positive electrode of the battery; one terminal of the primary side of the transformer is connected to the D pole of the MOS tube Q1, and the S pole of the MOS tube Q1 is grounded; the other terminal of the primary side of the transformer is connected to the D pole of Q2, the S pole of D2 is connected to one end of the current-sense resistor R1, and the other end of the current-sense resistor R1 is grounded.

[0033] Furthermore, the differential amplifier circuit includes resistors R2, R3, R6, and an operational amplifier chip U2; one end of the resistors R2 and R3 are respectively connected to the two ends of R1, and the other ends are respectively connected to the out-of-phase and in-phase terminals of the operational amplifier chip U2; after the in-phase terminal of U2 is connected to the resistor R6, R6 is grounded; the in-phase terminal of U2 is connected to the resistor R4, and the other end of R4 is connected to the terminal of the MCU.

[0034] Furthermore, the full-wave rectifier circuit includes diodes D1, D2, D3, and D4; the full-wave rectifier circuit is connected to an H-bridge circuit composed of switch tubes Q3, Q4, Q5, and Q6; diodes D1 and D2 are connected in series with D3 and D4 in parallel, and the two ends of the parallel connection are respectively connected to the two ends of the secondary side of the transformer; the switch tubes Q3, Q4, Q5, and Q6 form an H-bridge circuit, which converts the high-voltage direct current of the full-wave rectifier circuit connected thereto into industrial frequency alternating current.

[0035] Furthermore, it also includes a voice recognition system; the voice recognition system recognizes voice instructions through a voice acquisition device and sends them to the MCU, and the MCU drives the front-stage driving circuit or the rear-stage driving circuit according to the instructions.

[0036] Furthermore, it also includes a button for controlling the opening and closing of automatic sleep; after the button transmits the corresponding I / O level signal to the MCU through the button circuit, the MCU realizes the control of opening and closing of automatic sleep.

[0037] Furthermore, it also includes a signal transmission module; after the signal transmission module transmits the received automatic sleep start and stop signal of the mobile phone to the MCU, the MCU realizes the control of the automatic sleep start and stop. Specific embodiment:

[0039] Electrical equipment generally has three usage states. The first is when it is used according to its own rated power, and the current power consumption can be directly known through the current detection of the subsequent circuit. The second is in the shutdown state, and it can be judged that it is in the shutdown state by detecting that the power consumption of the subsequent stage is less than the preset value. The third is in the standby state. The power consumption in this state is very low, and it can be judged by detecting the accumulated power consumption of the previous and next stages for a certain period of time. Because the current detection accuracy of the previous stage circuit is much higher than that of the subsequent stage circuit, it can reach the mA level, but the current detection progress of the subsequent stage circuit is due to the high voltage, and the relative current detection accuracy is easily affected by the crosstalk problem of the AC signal, and the error is in tens of mA.

[0040] To solve this problem, in this embodiment, the energy consumption of the front and back stages is calculated by the front and back stage power consumption algorithm for a period of time, and whether the difference in energy consumption between the two for a period of time is greater than a preset threshold is calculated to determine whether the power-consuming device is in the standby state. If it is in the standby state, it is determined that the user device is an intermittent power-consuming device, and it is necessary to maintain the continuous output of the AC power of the energy storage power supply.

[0041] As attached Figure 4 As shown, this embodiment obtains the current value of the inverter front-stage circuit per unit time in the standby state of the power-consuming device; the current value of the inverter rear-stage AC circuit per unit time; the power loss value obtained by integrating the collected current value, and then respectively calculates the size of the power loss value of the two within a certain time; calculates the power consumption value of the user device for a certain time; and compares the calculated power consumption value of the user device with a suitable threshold to determine whether the user device is an indirect start-stop device. The algorithm uses the formula Q=I *t, Q represents the charge; I represents the current; t represents the time, which is used as the prior art in this method.

[0042] From the attached Figure 4 It can be seen that this method can solve the problem of how to determine whether the user equipment is an indirect start-stop device without communication.

[0043] As attached Figure 1-3 As shown, in this embodiment, the topological structure of the inverter circuit mainly includes two circuit parts, namely the front-stage bridge boost circuit and the rear-stage bridge circuit, as well as corresponding front-stage and rear-stage drive circuits, an auxiliary power supply circuit, and an MCU control circuit.

[0044] In order to obtain the power consumption of the front-stage and rear-stage circuits, it is necessary to collect the current and voltage signals in the front-stage and rear-stage circuits. Figure 3 As shown, in the front-stage circuit, the positive electrode of the battery pack is input to the main side of the transformer, flows through the MOS tube Q2 and then to the current-sense resistor R1, and then returns to the negative electrode of the battery pack. The front-stage battery end loop converts the current into a voltage signal through the current-sense resistor. According to Ohm's law, U=I*R, I is unknown. Using the known current-sense resistor R, the voltage across the resistor R is measured to obtain the magnitude of the current I flowing through. However, since the resistance of the current-sense resistor is very small, only a few or tens of milliohms, this current and voltage need to be processed by a circuit that amplifies the voltage signal. The current and voltage signals generally have crosstalk or high-order harmonics in the circuit. The amplified current analog signal needs to be filtered to obtain the ideal current signal before transmitting it to the ADC sampling pin of the MCU.

[0045] The front-stage circuit includes MOS tubes Q1 and Q2, and a bridge boost circuit composed of transformer T1. The function of this circuit is to convert low-voltage direct current into high-voltage and high-frequency alternating current. The drain of MOS tube Q2 is connected to the current-sense resistor R1; R2, R3, R4, R6, and U2 form a differential amplifier circuit, which can amplify the current signal flowing through R1 when the front-stage circuit is working by dozens of times (the specific value will be adjusted according to the actual situation). The amplified signal is transmitted to the ADC acquisition pin of the MCU, and the MCU will process this signal and save the relevant values.

[0046] The purpose of the op amp amplification circuit is that the voltage detected by the current flowing through is basically in the millivolt level because the resistance of the current-sense resistor is too small, so it is necessary to amplify the voltage across the resistor first. Composition and selection of op amp amplification circuit: You can choose a differential amplifier circuit. In the selection of op amp chips, you should pay attention to three aspects: one is the input power supply. The power supply voltage must include the amplified signal voltage; the second is the slew rate. When amplifying the voltage signal, if the slew rate is not large enough, the output voltage signal and the input voltage signal will be distorted, and the output voltage signal is not the actual current signal; the third is the bandwidth, which is usually called the unit gain bandwidth. It is used to measure the frequency range of the signal that the amplifier can handle. For this system solution, a bandwidth of several MB is generally sufficient.

[0047] The purpose of the current and voltage filter circuit is to absorb high-order harmonics, crosstalk and other clutter due to the complex situation in the circuit, and provide a clean voltage signal to the ADC input port of the MCU; usually an ordinary RC filter circuit can meet this circuit requirement.

[0048] In this solution, MCU (U1) has a sampling function. Currently, most MCUs on the market have integrated ADC signal acquisition function, which processes analog signals into digital signals. The MCU processor can process the collected voltage signals and read the current current size; Output I / O control: MCU controls whether the previous drive circuit is turned on or off according to the algorithm.

[0049] In the post-stage circuit, the post-stage bridge circuit mainly consists of D1, D2, D3, and D4 diodes to form a full-wave rectifier circuit. C3 generally uses a large electrolytic capacitor for filtering. There are also four switching elements Q3, Q4, Q5, and Q6 (usually transistors or MOSFETs) to form an H-bridge circuit to form a closed loop circuit. In this circuit, each switching element is connected to the other two switching elements to form a closed loop. When these switching elements are opened and closed in a specific order, alternating current can be generated.

[0050] Current detection circuit and high and low voltage isolation circuit: For AC high voltage loop current detection solutions, electrical isolation measures are basically adopted, which is represented by U4 chip in the figure, such as ACS712 chip, CC6900 chip and other Hall effect current sensor chips.

[0051] The voltage feedback loop includes filtering or signal attenuation of the current signal, which is selected according to the specific circuit chip. For example, if the MCU supply voltage is 3.3V and the Hall effect sensor supply voltage is 5.0V, a signal attenuation circuit is needed to process the output signal of the current sensor. If the supply voltages of the two are the same, only a filtering circuit needs to be added. In the figure, R7 and C5 are connected in parallel to form a basic filtering circuit.

[0052] The filtered signal will be transmitted to the pin of the MCU through the voltage follower circuit composed of the operational amplifier chip U3. This voltage follower circuit ensures that the signal will not attenuate during the transmission process and also has a certain filtering effect.

[0053] The MCU determines whether the electrical equipment is in shutdown or standby mode based on the current signal algorithm. If it is in standby mode, the microcontroller will continue to output the subsequent bridge drive signal.

[0054] In actual applications, it is also necessary to turn on and off the automatic sleep mode through voice, manual buttons, and mobile phone APP. The block diagrams are as follows: Figure 5-7 shown.

[0055] Figure 5 In the voice recognition control system, a microphone, a speaker and a voice recognition amplifier module are included. This system sends a related control request to the MCU after recognizing a fixed voice command, and replies to the user that the command has been received. After the MCU receives the control request from the voice module, it sends a control signal to the BMS circuit to turn on and off the sleep function; the BMS turns on and off the discharge function of the battery pack according to the MCU's instructions to turn on and off the sleep function; the bidirectional inverter module turns on and off the AC output according to the AC out control signal.

[0056] Figure 6 In the manual control of the automatic sleep function, this method is essentially the same as the voice control method, but the way of outputting instructions is different. 1. After the button is manually pressed, the pull-up button circuit will filter and eliminate the jitter interference signal, and then give the MCU's I / O port a level signal for a certain period of time. After the MCU receives this signal, the internal software transmits the corresponding instructions to the subsequent module according to the signal instruction. The BMS and bidirectional inverter module take corresponding actions according to the MCU's instructions to achieve the control of the automatic sleep function.

[0057] Figure 7 In the process, the mobile phone APP controls the opening and closing of the automatic sleep function; the command to close the sleep of the energy storage power supply is issued through the mobile phone APP operation interface. The Bluetooth module on the energy storage power supply receives the corresponding command and transmits the corresponding data signal to the MCU. After the MCU receives this signal, the internal software transmits the corresponding command to the subsequent module according to the signal command. The BMS and the bidirectional inverter module take corresponding actions according to the MCU's command to achieve the control of the automatic sleep opening and closing of the energy storage power supply.

[0058] Although the present invention has been disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection defined by the claims of this application.

Claims

1. A portable energy storage power supply that can be used for equipment with intermittent working functions, which controls whether the portable energy storage power supply turns off the dormancy function through an inverter circuit connected thereto, characterized in that: The inverter circuit includes a transformer front-stage circuit, a transformer, a transformer rear-stage circuit, an MCU with an integrated ADC signal acquisition function, a front-stage driving circuit, and a rear-stage driving circuit; The front-stage circuit includes a current-sensing resistor loop and a differential amplifier circuit; the current-sensing resistor loop is connected to the negative electrode of the battery pack, and the output voltage and current signals are sequentially transmitted to the MCU after being processed by the differential amplifier circuit and the current and voltage signal filtering; The post-stage circuit includes a full-wave rectifier circuit, a high-low voltage isolation current detection circuit, a voltage feedback loop, and a voltage follower circuit; the full-wave rectifier circuit is connected to the secondary side of the transformer, and the output AC power is transmitted to the voltage feedback loop for signal processing through the high-low voltage isolation current detection circuit; the current signal after filtering and signal attenuation processing of the voltage feedback loop is transmitted to the MCU after passing through the voltage follower circuit; The MCU receives the voltage and current of the front and rear stages based on a preset algorithm and compares the cumulative value of the charge consumption of the front and rear stage circuits in a preset time period, and sends a drive signal to the front or rear stage drive circuit according to the comparison result to control whether the power supply is in sleep mode.

2. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 1, characterized in that: The current-sense resistor loop includes a current-sense resistor R1, MOS tubes Q1, Q2, and a capacitor C1; one end of the capacitor C1 is connected to the middle terminal of the primary side of the transformer, and the other end is grounded; the middle terminal of the primary side of the transformer is connected to the positive electrode of the battery; one terminal of the primary side of the transformer is connected to the D pole of the MOS tube Q1, and the S pole of the MOS tube Q1 is grounded; the other terminal of the primary side of the transformer is connected to the D pole of Q2, the S pole of D2 is connected to one end of the current-sense resistor R1, and the other end of the current-sense resistor R1 is grounded.

3. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 2, characterized in that: The differential amplifier circuit includes resistors R2, R3, R6, and an operational amplifier chip U2; one end of the resistors R2 and R3 are respectively connected to the two ends of R1, and the other ends are respectively connected to the out-of-phase and in-phase terminals of the operational amplifier chip U2; after the in-phase terminal of U2 is connected to the resistor R6, R6 is grounded; the in-phase terminal of U2 is connected to the resistor R4, and the other end of R4 is connected to the terminal of the MCU.

4. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 1, characterized in that: The full-wave rectifier circuit includes diodes D1, D2, D3, and D4; the full-wave rectifier circuit is connected to an H-bridge circuit composed of switch tubes Q3, Q4, Q5, and Q6; diodes D1 and D2 are connected in series with D3 and D4 in parallel, and the two ends of the parallel connection are respectively connected to the two ends of the secondary side of the transformer; the switch tubes Q3, Q4, Q5, and Q6 form an H-bridge circuit, which converts the high-voltage direct current of the full-wave rectifier circuit connected thereto into industrial frequency alternating current.

5. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 1, characterized in that: It also includes a voice recognition system; the voice recognition system recognizes voice instructions through a voice acquisition device and sends them to the MCU, and the MCU drives the front-stage driving circuit or the rear-stage driving circuit according to the instructions.

6. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 1, characterized in that: It also includes a button for controlling the opening and closing of automatic sleep; after the button transmits the corresponding I / O level signal to the MCU through the button circuit, the MCU realizes the opening and closing of the automatic sleep control.

7. A portable energy storage power source that can be used for equipment with intermittent working functions according to claim 1, characterized in that: It also includes a signal transmission module; after the signal transmission module transmits the received automatic sleep start and stop signal of the mobile phone to the MCU, the MCU controls the start and stop of the automatic sleep.

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