Low-power energy storage circuit

Abstract

The utility model discloses a low-power energy storage circuit, which comprises a direct-current power supply input module, a charge / discharge switching module, an energy storage module and a power supply conversion module, the input end of the direct-current power supply input module is connected with an external direct-current power supply, the output end of the direct-current power supply input module is connected with the charge / discharge switching module, and the charge / discharge switching module is provided with two output ends. Wherein one super capacitor is connected with the input end of the energy storage module, the other super capacitor and the output end of the energy storage module are connected with the power supply conversion module, the output end of the power supply conversion module is connected with external small-size low-power equipment, and the energy storage module is formed by connecting a plurality of super capacitors in series. According to the utility model, standby power supply can be realized, the situation that important certificates cannot be returned to customers due to accidental power failure of equipment is prevented, unnecessary troubles are avoided, and meanwhile, the whole structure is small, the manufacturing cost is low, and the discharge performance is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of backup power supply, in particular to a low-power energy storage circuit. Background Art

[0002] With the widespread use of cash self-service equipment such as self-service cash machines, small low-power devices in the machines, such as electric magnetic card machines, will use suction to read customers' important credentials. At this time, if the self-service equipment encounters a special situation and loses power, the customer's important credentials such as bank cards will not be returned to the customer normally due to power outage, causing unnecessary trouble for the customer. The backup power supply of traditional electric magnetic card machines uses a high-voltage (27V) supercapacitor solution. Although this solution realizes backup power supply, it still has problems such as unstable discharge voltage and short power supply duration. At the same time, it is costly, large in size, and requires a large installation space, which is not conducive to the miniaturization of equipment. Utility Model Content

[0003] The purpose of the utility model is to propose a low-power energy storage circuit to address the deficiencies of the prior art, which can not only achieve backup power supply, prevent important certificates from being unable to be returned to customers due to accidental power failure of the equipment, and avoid unnecessary trouble, but also has a compact overall structure, low manufacturing cost and stable discharge performance.

[0004] The technical solution to achieve the purpose of this utility model is:

[0005] A low-power energy storage circuit comprises a DC power input module, a charge / discharge switching module, an energy storage module and a power supply conversion module, wherein the input end of the DC power input module is connected to an external DC power supply, and the output end is connected to the charge / discharge switching module, the charge / discharge switching module is provided with two output ends, one of which is connected to the input end of the energy storage module, and the other and the output end of the energy storage module are both connected to the power supply conversion module, the output end of the power supply conversion module is connected to an external small-sized low-power device, and the energy storage module is formed by a plurality of supercapacitors connected in series.

[0006] Furthermore, the input end of the DC power input module and the output end of the power supply conversion module are respectively provided with an interface J1 and an interface J2, and are connected to an external DC power supply and a small low-power device through the interface J1 and the interface J2 respectively.

[0007] Furthermore, the DC power input module includes an anti-reverse connection module and a charging current limiting module which are electrically connected in sequence, the input end of the anti-reverse connection module is electrically connected to the interface J1, and the output end of the charging current limiting module is connected to the charge / discharge switching module.

[0008] Furthermore, the anti-reverse connection module uses a diode D1, the positive electrode of the diode D1 is connected to the interface J1, and the negative electrode is connected to the charging current limiting module.

[0009] Furthermore, the charging current limiting module uses power resistors R3 and R4 arranged in parallel.

[0010] Furthermore, it also includes a temperature sensor whose input end is electrically connected to the interface J1, wherein the measuring end of the temperature sensor is close to the power resistors R3 and R4, and the output end is connected to the serial port and the measured temperature is fed back to the external host computer through the serial port.

[0011] Furthermore, the charge / discharge switching module includes a diode D2, a resistor R1, a resistor R2, a capacitor C10 and a field effect transistor P1, the positive electrode of the diode D2 is connected to the DC power input module, the negative electrode is simultaneously connected to the capacitor C10, the D electrode of the field effect transistor P1 and the input end of the energy storage module, the G electrode of the field effect transistor P1 is simultaneously connected to the other end of the capacitor C10 and the resistor R1, the other end of the resistor R1 is sequentially connected to the resistor R2 and the ground, and the S electrode of the field effect transistor P1 is connected to the power supply conversion module.

[0012] Furthermore, the power supply conversion module adopts a step-down voltage regulator chip of model XL6019.

[0013] By adopting the above technical solution, the utility model has the following beneficial effects:

[0014] (1) The utility model uses a plurality of low-voltage and high-capacitance supercapacitors connected in series to form a high-voltage and low-capacitance capacitor group as the energy storage module of the entire circuit. The external power supply is connected via a DC power input module. The charging or discharging of the energy storage module is controlled by a charge / discharge switching module, and a stable current output is provided to the outside by a power supply conversion module. This can realize backup power supply and prevent important vouchers from being unable to be returned to customers due to accidental power failure of the equipment, thus avoiding unnecessary trouble. At the same time, the overall structure is compact, the manufacturing cost is low, and the discharge performance is stable.

[0015] (2) The utility model is pre-installed with interface J1 and interface J2, which is convenient for connecting external DC power supply and equipment.

[0016] (3) The DC power input module of the utility model is provided with an anti-reverse connection module and a charging current limiting module, thereby improving the safety of charging.

[0017] (4) The reverse connection protection module of the utility model adopts a diode D1, and the charging current limiting module adopts parallel power resistors R3 and R4, which simplifies the circuit structure and reduces the circuit cost.

[0018] (5) The utility model is equipped with a temperature sensor, which can monitor the temperature of the power resistor in real time to further ensure charging safety.

[0019] (6) The charge / discharge switching mode of the utility model adopts field effect transistor P1 to control the switching of the charge and discharge modes, and the circuit structure is simple.

[0020] (7) The power supply conversion module of the utility model adopts the XL6019 step-down voltage regulator chip, which can convert the electricity stored in the energy storage module into a continuous and stable current output. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is a circuit structure diagram of the utility model;

[0023] Figure 2 It is the circuit principle diagram of the utility model;

[0024] Figure 3 This is a distribution diagram of circuit components of the utility model.

[0025] The reference numerals in the accompanying drawings are:

[0026] DC power input module 1, anti-reverse connection module 1-1, charging current limiting module 1-2, charge / discharge switching module 2, energy storage module 3, power supply conversion module 4. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] (Example 1)

[0029] like Figures 1 to 3 The low-power energy storage circuit shown includes a DC power input module 1, a charge / discharge switching module 2, an energy storage module 3 and a power conversion module 4. The input end of the DC power input module 1 is connected to an external DC power supply, and the output end is connected to the charge / discharge switching module 2. The charge / discharge switching module 2 is provided with two output ends, one of which is connected to the input end of the energy storage module 3, and the other is connected to the power conversion module 4 at the same time as the output end of the energy storage module 3. The output end of the power conversion module 4 is connected to an external small-sized low-power device, wherein the energy storage module 3 is composed of a plurality of low-voltage and high-capacitance supercapacitors connected in series, thereby being equivalent to a high-voltage and low-capacitance capacitor group. The external power supply is connected through the DC power input module 1, and the charge / discharge switching module 2 controls the energy storage module 3 to charge or discharge, and the power conversion module 4 provides a stable current output to the outside, which can realize backup power supply, prevent the important vouchers from being unable to be returned to the customer due to accidental power failure of the equipment, and avoid unnecessary trouble. At the same time, the overall structure is compact, the manufacturing cost is low, and the discharge performance is stable.

[0030] Specifically, the input end of the DC power input module 1 and the output end of the power supply conversion module 4 are respectively provided with an interface J1 and an interface J2, and the external DC power supply and the small low-power device are respectively connected through the interface J1 and the interface J2, which is convenient for connection. The DC power input module 1 includes an anti-reverse connection module 1-1 and a charging current limiting module 1-2 which are electrically connected in sequence to improve the safety of charging. The anti-reverse connection module 1-1 adopts a diode D1, and the charging current limiting module 1-2 adopts power resistors R3 and R4 arranged in parallel. In order to further ensure the safety of charging, the present embodiment is also provided with a temperature sensor which is closely attached to the power resistors R3 and R4, the input end of the temperature sensor is electrically connected to the interface J1, and the output end is connected to a serial port and the measured temperature is implemented and fed back to the external host computer through the serial port. The charge / discharge switching module includes a diode D2, a resistor R1, a resistor R2, a capacitor C10 and a field effect tube P1. The energy storage module 3 includes 9 supercapacitors connected in series, each with a withstand voltage of 3V and a capacitance of 10F, which is equivalent to a capacitor bank with a withstand voltage of 27V and a capacitance of 1.1F. The power supply conversion module includes capacitor C11, capacitor C12, capacitor C13, capacitor C14, resistor R5, resistor R6, resistor R7, two rectifier diodes D3, rectifier diode D4, inductor L1 and XL6019 buck regulator chip U1.

[0031] The positive electrode of diode D1 is connected to interface J1, and the negative electrode is connected to power resistors R3 and R4 at the same time. The other ends of power resistors R3 and R4 are connected to the positive electrode of diode D1, resistor R1 and resistor R2 at the same time. The positive electrode of diode D1 is connected to capacitor C10, D electrode of field effect tube P1 and the input end of energy storage module at the same time. The G electrode of field effect tube P1 is connected to the other end of capacitor C10 and the other end of resistor R1 at the same time. The other end of resistor R2 is grounded. The S electrode of field effect tube P1, the positive electrode of capacitor C13, capacitor C14, inductor L1 and the negative electrode of rectifier diode D4 are all connected to pin 4 of chip U1. The negative electrode of capacitor C13, the output end of energy storage module and the other end of capacitor C14 are all grounded. The other end of inductor L1 and the positive electrodes of two rectifier diodes D3 are all connected to pin 3 of chip U1. The positive electrode of rectifier diode D4 is connected to resistor R7 and pin 2 of chip U1 at the same time. The other end of resistor R7 and pin 1 of chip U1 are all grounded. The positive electrodes of the two rectifier diodes D3, the resistor R5, the capacitor C11 and the capacitor C12 are all connected to the interface J2, the other end of the resistor R5 and the resistor R6 are all connected to the 5th pin of the chip U1, and the other end of the resistor R6, the other end of the capacitor C11 and the negative electrode of the capacitor C12 are all grounded.

[0032] This embodiment uses the above circuit to achieve a capacitor capacity greater than 1F, a withstand voltage greater than 24V, and a capacitor output capacity of 18-25V, and a continuous output current of 2A for not less than 4 seconds. It can not only achieve backup power supply, prevent important certificates from being unable to be returned to customers due to accidental power outages of the equipment, and avoid unnecessary troubles, but also has a compact overall structure, low manufacturing cost, and stable discharge performance.

[0033] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-power energy storage circuit, characterized in that: The invention comprises a direct current power input module (1), a charge / discharge switching module (2), an energy storage module (3) and a power conversion module (4); the input end of the direct current power input module (1) is connected to an external direct current power source, and the output end is connected to the charge / discharge switching module (2); the charge / discharge switching module (2) is provided with two output ends, one of which is connected to the input end of the energy storage module (3), and the other and the output end of the energy storage module (3) are both connected to the power conversion module (4); the output end of the power conversion module (4) is connected to an external small-sized low-power device; and the energy storage module (3) is composed of a plurality of super capacitors connected in series.

2. A low-power energy storage circuit according to claim 1, characterized in that: The input end of the DC power input module (1) and the output end of the power conversion module (4) are provided with an interface J1 and an interface J2 respectively, and are connected to an external DC power supply and a small low-power device respectively through the interface J1 and the interface J2.

3. A low-power energy storage circuit according to claim 2, characterized in that: The DC power supply input module (1) comprises an anti-reverse connection module (1-1) and a charging current limiting module (1-2) which are electrically connected in sequence, the input end of the anti-reverse connection module (1-1) being electrically connected to an interface J1, and the output end of the charging current limiting module (1-2) being connected to a charge / discharge switching module (2).

4. A low-power energy storage circuit according to claim 3, characterized in that: The anti-reverse connection module (1-1) uses a diode D1, the positive pole of the diode D1 is connected to the interface J1, and the negative pole is connected to the charging current limiting module (1-2).

5. A low-power energy storage circuit according to claim 3, characterized in that: The charging current limiting module (1-2) adopts power resistors R3 and R4 which are arranged in parallel.

6. A low-power energy storage circuit according to claim 5, characterized in that: It also includes a temperature sensor whose input end is electrically connected to the interface J1. The measuring end of the temperature sensor is close to the power resistors R3 and R4. The output end is connected to the serial port and the measured temperature is fed back to the external host computer through the serial port.

7. A low-power energy storage circuit according to claim 1, characterized in that: The charge / discharge switching module (2) comprises a diode D2, a resistor R1, a resistor R2, a capacitor C10 and a field effect transistor P1; the positive electrode of the diode D2 is connected to the DC power input module (1); the negative electrode is simultaneously connected to the capacitor C10, the D electrode of the field effect transistor P1 and the input end of the energy storage module (3); the G electrode of the field effect transistor P1 is simultaneously connected to the other end of the capacitor C10 and the resistor R1; the other end of the resistor R1 is sequentially connected to the resistor R2 and the ground; and the S electrode of the field effect transistor P1 is connected to the power supply conversion module (4).

8. A low-power energy storage circuit according to claim 1, characterized in that: The power supply conversion module (4) adopts a step-down voltage stabilizing chip of model XL6019.

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