Energy storage power supply applied to data acquisition

Abstract

The utility model discloses an energy storage power supply applied to data acquisition, which comprises a three-phase four-wire input port for providing stable alternating current; the thermistor prevents overlarge current from damaging the circuit; the three-phase four-wire rectifying circuit is used for providing direct current required by a follow-up circuit; the EMI circuit is used for filtering electromagnetic interference; a filter circuit for further smoothing the direct current; the isolation transformer is used for converting the direct current into required voltage; the main winding rectification filtering output circuit obtains stable 12V direct current through rectification and filtering; the feedback circuit is used for stabilizing the output voltage of the main winding rectifying and filtering output circuit; the PWM controller receives the output voltage through a feedback circuit and generates a PWM signal; and the MOSFET is used for receiving the PWM signal and controlling the on / off of the MOSFET through the PWM signal. According to the utility model, output ripples and high-frequency peak tip components are reduced; and more stable output voltage is provided, and meanwhile, the power loss is also reduced.

Description

Technical Field

[0001] The utility model belongs to the field of energy storage power supplies, in particular to an energy storage power supply used for data acquisition. Background Art

[0002] The flyback circuit has a simple structure, a small number of components, and a low cost. It is widely applicable to various low-power switching power supplies ranging from a few watts to tens of watts. The flyback circuit is essentially the only low-power switching power supply widely used in various household appliances, computer equipment, and industrial equipment. Flyback switching power supplies have many advantages over traditional DC power supplies. First, they can provide a stable and reliable output voltage, making them suitable for applications that require high power stability. Second, flyback switching power supplies are highly efficient, effectively converting input power into output power, reducing energy loss. Furthermore, flyback transformer switching power supplies are compact and low-cost, making them widely used in electronic devices. The operating principle of a flyback switching power supply is based on the following key components: input filter, switching device, transformer, and output filter. The input filter removes noise and interference from the input power supply, the switching device regulates the conversion between input and output voltages, the transformer achieves voltage conversion through the principle of electromagnetic induction, and the output filter removes high-frequency noise and ripple from the output voltage, making the output voltage more stable and smooth. Despite these advantages, the flyback switching power supply also has some limitations.

[0003] The operating point of the transformer in a traditional flyback power supply is limited to the first quadrant of the magnetization curve plane, resulting in low transformer utilization. This, in turn, places high current peaks on the switching element, which manifests as high ripple and high-frequency spikes in the secondary output ripple. This limits its application. When the load is a relatively precise sensor, a separate linear regulator module is often required after the flyback power supply. For the linear power supply module to operate properly, the output voltage of the switching power supply must be approximately 2V higher than that of the linear power supply. This also results in additional power loss, especially at high output currents. Furthermore, traditional flyback power supplies lack energy storage capabilities. After power is disconnected, they rely entirely on the input high-voltage electrolytic capacitors and output electrolytic capacitors to maintain the power supply. This power supply method also suffers from poor stability, often requiring a 1 to 2V margin in the output voltage. This means that the data collector power supply must be approximately 2V lower than the power supply voltage to maintain a sufficient power-off period for data storage and other operations. This, to a certain extent, limits its performance. Utility Model Content

[0004] The purpose of the utility model is to provide an energy storage power supply for data acquisition to solve the above-mentioned problems existing in the prior art.

[0005] Technical solution: an energy storage power supply for data acquisition, comprising:

[0006] Three-phase four-wire input port, the mains power enters the system through the three-phase four-wire input port, providing stable AC power;

[0007] Thermistor, AC power is surge protected through thermistor to prevent excessive current from damaging the circuit and output three-phase AC power;

[0008] Three-phase four-wire rectifier circuit, which rectifies three-phase AC power into DC power and provides DC power required by subsequent circuits;

[0009] EMI circuit, filtering out electromagnetic interference to ensure the stability and reliability of DC power;

[0010] The filter circuit further smoothes the DC power after filtering out electromagnetic interference, reduces ripple and noise, and outputs smoothed DC power;

[0011] Isolation transformer, which converts the smoothed DC power into the required voltage and provides electrical isolation to ensure safety;

[0012] The main winding rectifier filter output circuit, the required voltage output by the main winding of the isolation transformer is rectified and filtered to obtain a stable 12V DC power;

[0013] Feedback circuit, used to stabilize the output voltage of the main winding rectifier filter output circuit;

[0014] The PWM controller receives the output voltage of the main winding rectifier filter output circuit through the feedback circuit and generates a PWM signal;

[0015] MOSFET receives PWM signals and controls the switching frequency and duty cycle of the MOSFET through the PWM signals. At the same time, it receives the smoothed DC power provided by the filter circuit to ensure that the MOSFET can work normally during the switching process.

[0016] According to one aspect of the present application, the feedback circuit includes a TL431 voltage feedback circuit and an optocoupler isolation circuit.

[0017] According to one aspect of the present application, a backup power supply is also included. When the main power supply is disconnected, the backup power supply automatically switches to the main circuit to provide continuous current output.

[0018] According to one aspect of the present application, the backup power supply is a supercapacitor energy storage module.

[0019] According to one aspect of the present application, the filtering circuit includes an input voltage source Vin, a capacitor Cin0, a capacitor Cin1, a capacitor Cin2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D2, a diode D3, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, a resistor R1, a resistor R2, a resistor R3, an ammeter A1, an ammeter A2 and a voltmeter V, wherein one end of the input voltage source Vin is connected to one end of the capacitor Cin0, the other end of the input voltage source Vin is connected to the other end of the capacitor Cin0, one end of the capacitor Cin0 is simultaneously connected to the ammeter A1 and one end of the voltmeter V, the other end of the voltmeter V is connected to the other end of the capacitor Cin0, the other end of the ammeter A1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is simultaneously connected to the other end of the voltmeter V and one end of the resistor R1, and the other end of the resistor R1 is connected to the positive electrode of the diode D2. One end is simultaneously connected to one end of capacitor Cin1 and capacitor Cin2, the other end of capacitor Cin1 is simultaneously connected to ammeter A2 and one end of capacitor C1, the other end of capacitor C1 is simultaneously connected to one end of capacitor C2 and the anode of diode D13, the other end of capacitor C2 is simultaneously connected to the anode of diode D11 and the cathode of diode D12, the cathode of diode D11 is simultaneously connected to the cathode of diode D3 and the other end of capacitor Cin2, the anode of diode D12 is connected to one end of resistor R2, the other end of resistor R2 is simultaneously connected to the cathode of diode D13, one end of capacitor C3, and one end of capacitor C4, the anode of diode D13 is connected to the cathode of diode D14, the anode of diode D14 is connected to one end of resistor R3, the other end of resistor R3 is simultaneously connected to the other end of capacitor C3 and the cathode of diode D15, the anode of diode D15 is connected to the other end of ammeter A2, and the other end of capacitor C4 is connected to the cathode of diode D11.

[0020] According to one aspect of the present application, the backup power supply includes a current source I, a transformer T, a capacitor C1, a capacitor C2, an inductor L, a diode D1, a diode D4, a diode D5, a diode D6, a diode D7, a transistor VT1, a driver D, and a load resistor Rload, wherein the current source I is connected to the primary coil of the transformer T, one end of the secondary coil of the transformer T is simultaneously connected to the anode of the diode D4 and the cathode of the diode D5, the cathode of the diode D4 is simultaneously connected to the cathode of the diode D6 and one end of the capacitor C1, and the other end of the capacitor C1 is simultaneously connected to the anode of the diode D7 and the cathode of the diode D5. The cathode of diode D7 is connected to one end of the secondary coil and the anode of diode D6 at the same time. The other end of inductor L is connected to the cathode of diode D1 and the collector of transistor VT1 at the same time. The base of transistor VT1 is connected to one end of driver D. The other end of driver D is connected to the anode of diode D1 and one end of capacitor C2 at the same time. The emitter of transistor VT1 is connected to one end of capacitor C1 and the other end of capacitor C2 at the same time. One end of capacitor C2 is connected to one end of load resistor Rload. The other end of load resistor Rload is connected to the other end of capacitor C2.

[0021] Beneficial effects: The utility model provides a power supply solution with auxiliary power supply function, which improves the utilization rate of the transformer, reduces the current peak borne by the switching element, thereby reducing the output ripple and high-frequency peak components; provides a more stable output voltage; reduces power consumption loss through the feedback circuit, and at the same time ensures the stability and reliability of the circuit through the backup power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a principle block diagram of the utility model.

[0023] Figure 2 This is a circuit diagram of a filter circuit according to an embodiment of the present invention.

[0024] Figure 3 This is a backup power supply circuit diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0025] This application proposes an energy storage power supply for data acquisition, comprising:

[0026] Three-phase four-wire input port, the mains power enters the system through the three-phase four-wire input port, providing stable AC power;

[0027] Thermistor, AC power is surge protected through thermistor to prevent excessive current from damaging the circuit and output three-phase AC power;

[0028] Three-phase four-wire rectifier circuit, which rectifies three-phase AC power into DC power and provides DC power required by subsequent circuits;

[0029] EMI circuit, filtering out electromagnetic interference to ensure the stability and reliability of DC power;

[0030] The filter circuit further smoothes the DC power after filtering out electromagnetic interference, reduces ripple and noise, and outputs smoothed DC power;

[0031] Isolation transformer, which converts the smoothed DC power into the required voltage and provides electrical isolation to ensure safety;

[0032] The main winding rectifier filter output circuit, the required voltage output by the main winding of the isolation transformer is rectified and filtered to obtain a stable 12V DC power;

[0033] Feedback circuit, used to stabilize the output voltage of the main winding rectifier filter output circuit;

[0034] The PWM controller receives the output voltage of the main winding rectifier filter output circuit through the feedback circuit and generates a PWM signal;

[0035] MOSFET receives PWM signals and controls the switching frequency and duty cycle of the MOSFET through the PWM signals. At the same time, it receives the smoothed DC power provided by the filter circuit to ensure that the MOSFET can work normally during the switching process.

[0036] According to one aspect of the present application, a backup power supply is also included. When the main power supply is disconnected, the backup power supply automatically switches to the main circuit to provide continuous current output. The backup power supply is a supercapacitor energy storage module.

[0037] According to one aspect of the present application, the feedback circuit includes a TL431 voltage feedback circuit and an optocoupler isolation circuit. The TL431 voltage feedback circuit samples the output voltage of the main winding rectifier and filter output circuit and compares it with a preset reference voltage to adjust the output of the PWM controller to ensure output voltage stability. The optocoupler isolation circuit electrically isolates the control circuit from the power circuit, enhancing the system's anti-interference capabilities.

[0038] like Figure 1 As shown, the present invention primarily consists of a switching power supply and a MOS transistor driver circuit. In the switching power supply, AC power is supplied to the power supply input port, passes through the EMI circuit, and undergoes electromagnetic interference filtering. After rectification and filtering, a DC voltage is generated. The switching transistor and switching transformer, controlled by a PWM signal, convert this DC voltage to the desired voltage. This is the complete AC-to-DC conversion process.

[0039] The system also incorporates an energy storage power supply. When the AC power is disconnected, the energy storage power supply automatically switches to the main circuit to carry the output current. The energy storage power supply is an energy storage module based on supercapacitors. Supercapacitors are characterized by large capacity, strong discharge capacity, and the ability to output large currents along the electrical path while also producing low noise, making them particularly suitable for use as energy storage modules.

[0040] The utility model has complete protection functions: short circuit protection, overvoltage protection, overcurrent protection, overheat protection, overload protection, leakage protection, etc. In addition, the utility model also overcomes the shortcomings of the power supply made of the power frequency transformer in the past, such as large size, heavy weight, loud noise, low efficiency and high cost.

[0041] In one embodiment of the present application, the switching power supply adopts a flyback topology. The PWM control chip L6561 generates a PWM drive signal that drives the gate of the MOS tube through a slow-on and fast-off circuit composed of resistors and diodes. After transformer coupling, two outputs with center taps are generated, where the lower part of the tap is the actual power output winding, and the upper part of the tap is set to bias the NMOS. The output voltage of the switching power supply is stabilized by a circuit composed of TL431 and an optocoupler and is ultimately set at 12.3V. It is applied to the drain of the NMOS. The gate voltage of the NMOS is controlled by the cathode of another TL431, and the reference of this TL431 serves as the sampling end of the actual output voltage. The final output voltage is set to 12.00V.

[0042] The technical parameters of this utility model are as follows:

[0043] 1. Input voltage and frequency: AC220V±10% 50Hz;

[0044] 2. Output and frequency: 12.00V ±1%;

[0045] 3. Driving power: 50W;

[0046] 4. Power off maintenance time: more than 5 minutes;

[0047] 5. Efficiency: more than 80%;

[0048] 6. Operating environment: -10℃—+50℃;

[0049] 7. Ambient humidity: 10-90﹪RH;

[0050] 8. Storage temperature: -30—+60℃;

[0051] 9. Storage humidity: 5-93﹪RH.

[0052] like Figure 2As shown, in one embodiment of the present application, the filtering circuit includes an input voltage source Vin, a capacitor Cin0, a capacitor Cin1, a capacitor Cin2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D2, a diode D3, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, a resistor R1, a resistor R2, a resistor R3, an ammeter A1, an ammeter A2 and a voltmeter V, wherein one end of the input voltage source Vin is connected to one end of the capacitor Cin0, the other end of the input voltage source Vin is connected to the other end of the capacitor Cin0, one end of the capacitor Cin0 is simultaneously connected to the ammeter A1 and one end of the voltmeter V, the other end of the voltmeter V is connected to the other end of the capacitor Cin0, the other end of the ammeter A1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is simultaneously connected to the other end of the voltmeter V and one end of the resistor R1, and the resistor R1 The other end of the resistor R2 is connected to one end of the capacitor Cin1 and capacitor Cin2 at the same time. The other end of the capacitor Cin1 is connected to ammeter A2 and one end of the capacitor C1 at the same time. The other end of the capacitor C1 is connected to one end of the capacitor C2 and the anode of the diode D13 at the same time. The other end of the capacitor C2 is connected to the anode of the diode D11 and the cathode of the diode D12 at the same time. The cathode of the diode D11 is connected to the cathode of the diode D3 and the other end of the capacitor Cin2 at the same time. The anode of the diode D12 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the cathode of the diode D13, one end of the capacitor C3 and one end of the capacitor C4 at the same time. The anode of the diode D13 is connected to the cathode of the diode D14. The anode of the diode D14 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the other end of the capacitor C3 and the cathode of the diode D15 at the same time. The anode of the diode D15 is connected to the other end of the ammeter A2. The other end of the capacitor C4 is connected to the cathode of the diode D11.

[0053] like Figure 3As shown, in one embodiment of the present application, the backup power supply includes a current source I, a transformer T, a capacitor C1, a capacitor C2, an inductor L, a diode D1, a diode D4, a diode D5, a diode D6, a diode D7, a transistor VT1, a driver D and a load resistor Rload, wherein the current source I is connected to the primary coil of the transformer T, one end of the secondary coil of the transformer T is simultaneously connected to the anode of the diode D4 and the cathode of the diode D5, the cathode of the diode D4 is simultaneously connected to the cathode of the diode D6 and one end of the capacitor C1, and the other end of the capacitor C1 is simultaneously connected to the anode of the diode D7 and the cathode of the diode D5. The positive electrode of is connected to one end of the inductor L, the negative electrode of the diode D7 is connected to the other end of the secondary coil and the positive electrode of the diode D6 at the same time, the other end of the inductor L is connected to the negative electrode of the diode D1 and the collector of the transistor VT1 at the same time, the base of the transistor VT1 is connected to one end of the driver D, the other end of the driver D is connected to the positive electrode of the diode D1 and one end of the capacitor C2 at the same time, the emitter of the transistor VT1 is connected to one end of the capacitor C1 and the other end of the capacitor C2 at the same time, one end of the capacitor C2 is connected to one end of the load resistor Rload, and the other end of the load resistor Rload is connected to the other end of the capacitor C2.

[0054] The utility model provides a power supply solution with auxiliary power supply function, which has the characteristics of high efficiency of switching power supply and long-term offline power supply, and is particularly suitable for uninterrupted data acquisition systems.

[0055] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. An energy storage power supply for data acquisition, characterized in that: include: Three-phase four-wire input port, the mains power enters the system through the three-phase four-wire input port, providing stable AC power; Thermistor, AC power is surge protected through thermistor to prevent excessive current from damaging the circuit and output three-phase AC power; Three-phase four-wire rectifier circuit, which rectifies three-phase AC power into DC power and provides DC power required by subsequent circuits; EMI circuit, filtering out electromagnetic interference to ensure the stability and reliability of DC power; The filter circuit further smoothes the DC power after filtering out electromagnetic interference, reduces ripple and noise, and outputs smoothed DC power; Isolation transformer, which converts the smoothed DC power into the required voltage and provides electrical isolation to ensure safety; The main winding rectifier filter output circuit, the required voltage output by the main winding of the isolation transformer is rectified and filtered to obtain a stable 12V DC power; Feedback circuit, used to stabilize the output voltage of the main winding rectifier filter output circuit; The PWM controller receives the output voltage of the main winding rectifier filter output circuit through the feedback circuit and generates a PWM signal; MOSFET receives PWM signals and controls the switching frequency and duty cycle of the MOSFET through the PWM signals. At the same time, it receives the smoothed DC power provided by the filter circuit to ensure that the MOSFET can work normally during the switching process.

2. The energy storage power supply for data acquisition according to claim 1, characterized in that: The feedback circuit includes a TL431 voltage feedback circuit and an optocoupler isolation circuit.

3. The energy storage power supply for data acquisition according to claim 1, characterized in that: It also includes a backup power supply. When the main power supply is disconnected, the backup power supply automatically switches to the main circuit to provide continuous current output.

4. The energy storage power supply for data acquisition according to claim 3, characterized in that: The backup power supply is a supercapacitor energy storage module.

5. The energy storage power supply for data acquisition according to claim 1, characterized in that: The filter circuit includes an input voltage source Vin, a capacitor Cin0, a capacitor Cin1, a capacitor Cin2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D2, a diode D3, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, a resistor R1, a resistor R2, a resistor R3, an ammeter A1, an ammeter A2 and a voltmeter V, wherein one end of the input voltage source Vin is connected to one end of the capacitor Cin0, the other end of the input voltage source Vin is connected to the other end of the capacitor Cin0, one end of the capacitor Cin0 is simultaneously connected to the ammeter A1 and one end of the voltmeter V, the other end of the voltmeter V is connected to the other end of the capacitor Cin0, the other end of the ammeter A1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is simultaneously connected to the other end of the voltmeter V and one end of the resistor R1, and the other end of the resistor R1 is simultaneously connected to the Capacitor Cin1 is connected to one end of capacitor Cin2, the other end of capacitor Cin1 is connected to ammeter A2 and one end of capacitor C1, the other end of capacitor C1 is connected to one end of capacitor C2 and the anode of diode D13, the other end of capacitor C2 is connected to the anode of diode D11 and the cathode of diode D12, the cathode of diode D11 is connected to the cathode of diode D3 and the other end of capacitor Cin2, the anode of diode D12 is connected to one end of resistor R2, the other end of resistor R2 is connected to the cathode of diode D13, one end of capacitor C3, and one end of capacitor C4, the anode of diode D13 is connected to the cathode of diode D14, the anode of diode D14 is connected to one end of resistor R3, the other end of resistor R3 is connected to the other end of capacitor C3 and the cathode of diode D15, the anode of diode D15 is connected to the other end of ammeter A2, and the other end of capacitor C4 is connected to the cathode of diode D11.

6. The energy storage power supply for data acquisition according to claim 3, characterized in that: The backup power supply includes a current source I, a transformer T, a capacitor C1, a capacitor C2, an inductor L, a diode D1, a diode D4, a diode D5, a diode D6, a diode D7, a transistor VT1, a driver D, and a load resistor Rload, wherein the current source I is connected to the primary coil of the transformer T, one end of the secondary coil of the transformer T is simultaneously connected to the anode of the diode D4 and the cathode of the diode D5, the cathode of the diode D4 is simultaneously connected to the cathode of the diode D6 and one end of the capacitor C1, and the other end of the capacitor C1 is simultaneously connected to the anode of the diode D7, the anode of the diode D5, and the inductor L The cathode of diode D7 is connected to the other end of the secondary coil and the anode of diode D6 at the same time. The other end of inductor L is connected to the cathode of diode D1 and the collector of transistor VT1 at the same time. The base of transistor VT1 is connected to one end of driver D. The other end of driver D is connected to the anode of diode D1 and one end of capacitor C2 at the same time. The emitter of transistor VT1 is connected to one end of capacitor C1 and the other end of capacitor C2 at the same time. One end of capacitor C2 is connected to one end of load resistor Rload. The other end of load resistor Rload is connected to the other end of capacitor C2.

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