Super capacitor charging and discharging circuit

Abstract

The utility model discloses a super capacitor charging and discharging circuit, which relates to the technical field of circuit design and comprises a power supply, an N-type MOS (Metal Oxide Semiconductor) tube, a P-type MOS tube, a super capacitor and resistors R1, R2, R3 and R4, the grid electrode of the N-type MOS tube is connected with the first end of the resistor R3, the first end of the resistor R4 and the grid electrode of the P-type MOS tube, and the other end of the resistor R4 is grounded; one end of the resistor R1 is connected with an N-type MOS tube, the other end of the resistor R3 is connected with a power supply, a drain electrode of the N-type MOS tube is connected with first ends of the resistor R1 and the resistor R2, the first ends of the resistor R1 and the resistor R2 are both connected with the power supply, a source electrode of the N-type MOS tube is connected with a drain electrode of the P-type MOS tube through a first end of the super capacitor, a source electrode of the P-type MOS tube is connected with an output end, and the other end of the super capacitor is connected with the power supply. And the grid electrode of the P-type MOS tube is grounded through a resistor R4. According to the utility model, active charging and discharging can be realized without external factor intervention, the charging and discharging circuit can be simplified, the charging and discharging efficiency is improved, and the charging and discharging loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design technical field especially relates to a kind of super capacitor charging and discharging circuit. BACKGROUND

[0002] With more and more modern products, the safety requirement is higher and higher. As a storage chip, power supply facilities are needed to store data. In normal circumstances, it is charged and discharged simultaneously, but in emergency situations, especially in the moment of accident, data is easy to lose. The main reason for loss is that power is not saved in time.

[0003] The prior art proposes to use super capacitor as backup power supply for storage chip. In the process of lossless discharging and charging of super capacitor, the storage chip can work normally. In the patent with publication number CN219999079U and the name of a super capacitor charging and discharging circuit, constant voltage output is realized by power module to charge super capacitor C1. Super capacitor C1 is a super capacitor C1 for backup power. The switching unit is controlled by the battery unit. When there is a battery unit input, the switching unit is in conduction mode and the power module has input power. At this time, the normal output voltage is given to the super capacitor C1 for charging. Since the voltage at VCC is used by the power unit, the voltage of the power unit during charging is the output voltage of the power module. Therefore, the power unit can still work normally during charging. When the battery unit is removed, i.e. power off, the switching unit will be disconnected. Thus, the charge on the super capacitor C1 is only used by the load of the power device. This achieves lossless.

[0004] In the above-mentioned scheme, super capacitor C1 charging is controlled by battery unit. When the battery unit is abnormal, super capacitor charging fails. When diode D fails, super capacitor charging fails. Moreover, the prior art is usually through active charging and passive discharging or passive charging and active discharging. Both of these two schemes need external factors to intervene to force charging or discharging. The actual application scene is not as practical as active charging and active discharging. Therefore, it is urgent to provide a charging and discharging circuit that can actively charge and discharge without external intervention to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a kind of super capacitor charging and discharging circuit, without external intervention, to realize active charging and discharging, can simplify charging and discharging circuit, improve charging and discharging efficiency, reduce charging and discharging loss.

[0006] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0007] The application discloses a super capacitor charging and discharging circuit which comprises a power supply, an N-type MOS tube, a P-type MOS tube, a super capacitor and resistors R1, R2, R3 and R4.

[0008] Further, the resistor R1 and the resistor R2 are connected in parallel to form a current limiting circuit.

[0009] Further, the resistor R3 and the resistor R4 are connected in series to form a driving circuit.

[0010] Further, the current limiting circuit, the driving circuit, the N-type MOS tube and the super capacitor form a super capacitor charging circuit.

[0011] Further, the resistor R4, the P-type MOS tube and the super capacitor form a super capacitor discharging circuit.

[0012] Further, the power supply is a direct current power supply.

[0013] According to the specific embodiment of the application, the super capacitor charging and discharging circuit has the following technical effects: the super capacitor charging and discharging circuit adopts the resistors R3 and R4 to divide the voltage of the power supply, when the power supply has voltage, the N-type MOS tube is always in an open state through the voltage division of the resistor R3, and the super capacitor is in a charging state; on the contrary, when the power supply has no voltage, the resistor R4 is grounded to open the P-type MOS tube, and the super capacitor starts to discharge at this time, so that the super capacitor charging and discharging is guaranteed without the intervention of external factors, the charging and discharging circuit is simplified, the charging and discharging efficiency is improved, and the charging and discharging loss is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0015] Figure 1 The application discloses a super capacitor charging and discharging circuit which comprises a power supply, an N-type MOS tube, a P-type MOS tube, a super capacitor and resistors R1, R2, R3 and R4. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0017] The utility model discloses a kind of super capacitor charge-discharge circuits, without external intervention can realize active charge-discharge, it can simplify charge-discharge circuit, improve charge-discharge efficiency, reduce charge-discharge loss.

[0018] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0019] As Figure 1 As shown in the utility model, a kind of super capacitor charge-discharge circuit provided in the embodiment, including power supply, N type MOS tube, P type MOS tube, super capacitor and resistance R1, R2, R3, R4;The gate of N type MOS tube is connected with the one end of resistance R3, the one end of resistance R4, the gate of P type MOS tube, the other end of resistance R4 is grounded;The other end of R3 is connected with power supply, the drain of N type MOS tube is connected with the one end of resistance R1 and the one end of resistance R2, the other end of resistance R1 and resistance R2 is connected with power supply, the source of N type MOS tube is connected to the one end of super capacitor, the drain of P type MOS tube, the source of P type MOS tube is connected with output end, the other end of super capacitor is connected with power supply, the gate of P type MOS tube is grounded through resistance R4.

[0020] The circuit is composed of four parts: super capacitor charging circuit, super capacitor discharging circuit, current limiting circuit, driving circuit.

[0021] Resistance R1 and resistance R2 are connected in parallel to form a current limiting circuit, and resistance R1 and R2 are current limiting resistors when charging N type MOS tube.

[0022] Resistance R3 and resistance R4 are connected in series to form a driving circuit, and the working principle is as follows: when the DC source has electricity, the voltage is divided by R3 and R4 to provide a driving voltage for N type MOS tube, and when the DC source is powered off, the P type MOS tube is pulled to GND through resistance R4 to provide a driving for P type MOS tube.

[0023] The current limiting circuit, the driving circuit, the N-type MOS tube, and the super capacitor constitute a super capacitor charging circuit, and the working principle is as follows: when the DC source has electricity, the driving voltage is provided for the N-type MOS tube through voltage division of resistors R3 and R4, and the charging is completed through opening of the N-type MOS tube DS.

[0024] The resistor R4, the P-type MOS tube, and the super capacitor constitute a super capacitor discharging circuit, and the working principle is as follows: when the DC source is powered off, the P-type MOS tube is quickly pulled to GND through the resistor R4, and the discharging is completed through opening of the P-type MOS tube DS.

[0025] The working principle of the super capacitor charging and discharging circuit is as follows:

[0026] The resistors R3 and R4 continuously detect the DC source, and when the DC source has voltage, the driving voltage is provided for the N-type MOS tube through voltage division of the resistors R3 and R4, the N-type MOS tube opens D (drain)-S (source), the super capacitor is current-limited through R1 and R2, and when the voltage of the super capacitor is equal to the voltage of the DC source, the charging is completed. The resistor R4 continuously detects the DC source, and when the DC source pulls the G level of the P-type MOS tube to GND, the P-type MOS tube opens, and the super capacitor completes discharging.

[0027] In summary, the super capacitor charging and discharging circuit provided by the utility model continuously detects the DC source voltage through the resistors R3 and R4, the super capacitor is charged when the DC source has electricity, the super capacitor is discharged when the DC source is powered off, and the circuit design is simple.

[0028] In the remaining technical features in the embodiment, the person skilled in the art can flexibly select to meet different specific actual needs. However, it is obvious to the person skilled in the art that the specific details do not have to be used to implement the utility model. In other examples, in order to avoid confusion of the utility model, the well-known components, structures or parts are not specifically described, and are within the technical solution limited in the technical protection range claimed in the claims of the utility model.

[0029] The changes and variations made by the person skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the protection scope of the claims of the utility model. In the above description, a large number of specific details are described in order to provide a thorough understanding of the utility model. However, it is obvious to the person skilled in the art that the specific details do not have to be used to implement the utility model. In other examples, in order to avoid confusion of the utility model, the well-known technology, such as specific construction details, operation conditions and other technical conditions, is not specifically described.

[0030] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the present application should not be understood as the limitation of the present application.

Claims

1. A supercapacitor charge-discharge circuit, characterized by, The power supply, N-type MOS tube, P-type MOS tube, super capacitor and resistors R1, R2, R3 and R4 are included. One end of the resistor R3 and one end of the resistor R4 are connected to the gate of the N-type MOS tube and the gate of the P-type MOS tube, and the other end of the resistor R4 is grounded; the other end of the resistor R3 is connected to the power supply, one end of the resistor R1 and one end of the resistor R2 are connected to the drain of the N-type MOS tube, and the other ends of the resistors R1 and R2 are connected to the power supply; the source of the N-type MOS tube is connected to one end of the super capacitor and the drain of the P-type MOS tube, respectively; the source of the P-type MOS tube is connected to the output end; the other end of the super capacitor is connected to the power supply; and the gate of the P-type MOS tube is grounded through the resistor R4.

2. The supercapacitor charge and discharge circuit of claim 1, wherein, The resistor R1 and the resistor R2 are connected in parallel to form a current limiting circuit.

3. The supercapacitor charge and discharge circuit of claim 2, wherein, The resistor R3 and the resistor R4 are connected in series to form a driving circuit.

4. The supercapacitor charge and discharge circuit of claim 3, wherein, The current limiting circuit, the driving circuit, the N-type MOS tube and the super capacitor form a super capacitor charging circuit.

5. The supercapacitor charge and discharge circuit of claim 1, wherein, The resistor R4, the P-type MOS tube and the super capacitor form a super capacitor discharging circuit.

6. The supercapacitor charge and discharge circuit of claim 1, wherein, The power supply is a direct current power supply.

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