CN210270188U

CN210270188U - Power supply management circuit for personal dosage alarm instrument

Info

Publication number: CN210270188U
Application number: CN201920903624.2U
Authority: CN
Inventors: 占星
Original assignee: Suzhou Zhongfu Fu'an Instrument Co ltd
Current assignee: Suzhou Zhongfu Fu'an Instrument Co ltd
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-04-07
Anticipated expiration: 2029-06-17

Abstract

The utility model discloses a power management circuit for personal dosage alarm instrument in the technical field of power management circuit, which comprises a linear charger and a battery, wherein the initial energy input end and the voltage input end of the linear charger are simultaneously connected with the voltage output end of MICRO/USB, the battery connecting end of the linear charger is connected with a battery charging circuit, the battery charging circuit is a charging circuit with parallel circuits and capacitors, the battery is connected with a charging protection circuit and a power display circuit, the charging protection circuit comprises a lithium battery protection plate and an MOS tube, the power input end of the lithium battery protection plate is connected with the battery, the charging control output end and the discharging control output end of the lithium battery protection plate are respectively connected with a first grid and a second grid of the MOS tube, the power display circuit comprises a diode, an LED and a triode, the power display circuit is connected with a battery power supply, after voltage division by VDl, VD2 and VD3, the two triodes Vl, the utility model discloses reduce battery consumption, increase of service life, more environmental protection.

Description

Power supply management circuit for personal dosage alarm instrument

Technical Field

The utility model relates to a power management circuit technical field specifically is a power management circuit for individual dose alarm appearance.

Background

The personal dose alarm is used for monitoring the personal radiation dose of radioactive workers and alarming for protection. The personal dosage alarm is a portable detection instrument, is small in size, can be carried about, can display a measurement value and provides an alarm prompt of exceeding a threshold value. When exceeding safe threshold value, require to provide the buzzer warning and the light scintillation warning of high decibel, and then to the consumption ratio of power more, present personal dose alarm appearance uses the dry battery power supply that can not charge mostly for personal dose alarm appearance continuous operation time is short, and need constantly change the battery, neither economy nor environmental protection.

Based on this, the utility model designs a power management circuit for individual dose alarm to solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power management circuit for individual dose alarm appearance to solve the dry battery power supply that can not charge that the most use of current individual dose alarm appearance that provides among the above-mentioned background art, make individual dose alarm appearance continuous operation time short, and need constantly change the battery, neither economy nor the problem of environmental protection.

In order to achieve the above object, the utility model provides a following technical scheme:

a power management circuit for a personal dosage alarm device comprises a linear charger and a battery, wherein an energy starting input end and a voltage input end of the linear charger are simultaneously connected with a MICRO/USB voltage output end, the battery connecting end of the linear charger is connected with a battery charging circuit which is a charging circuit formed by connecting a circuit and a capacitor in parallel, the battery is connected with a charging protection circuit and an electric quantity display circuit, the charging protection circuit comprises a lithium battery protection board and an MOS tube, the power input end of the lithium battery protection board is connected with a battery, the charging control output end and the discharging control output end of the lithium battery protection board are respectively connected with a first grid and a second grid of an MOS (metal oxide semiconductor) tube, the electric quantity display circuit comprises a diode, an LED and a triode, the electric quantity display circuit is connected with a battery power supply and is fed into the two triodes Vl and V2 point by point after being subjected to voltage division by VDl, VD2 and VD 3.

Preferably, a diode is connected to the voltage output terminal of the MICRO/USB, and the diode is simultaneously connected to the energy input terminal and the voltage input terminal of the linear charger.

Preferably, the linear charger is of a model TP4056, and the TMP and GND pins of the TP4056 are both grounded.

Preferably, the type of the triode is 2SC9014, and the type of the diode is 1N 4148.

Preferably, the MOS tube is 8205A in model number, and the lithium battery protection plate is DW01 in model number.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a MICRO USB passes through TP4056 and provides the power and charges for its inside battery for the alarm instrument, and TP4056 can be fit for USB power and adapter power work, and charging voltage is fixed in 4.2V, and when charging current dropped to setting value 1/10 after reaching final float voltage, TP4056 will terminate the charge cycle automatically. When the input voltage MICRO/USB is taken away, TP4056 automatically enters a low current state, the leakage current of the battery is reduced to be below 2uA, TP4056 can also be placed in a shutdown mode when a power supply is available, the power supply current is lower than 55uA, the battery consumption is reduced, the service life is prolonged, the rechargeable battery is prevented from being replaced, and the rechargeable battery is more environment-friendly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a MICRO/USB pin according to the present invention;

FIG. 2 is a schematic diagram of the power management circuit of the present invention;

fig. 3 is a schematic diagram of the battery charging circuit of the present invention;

fig. 4 is a schematic diagram of the charging protection circuit of the present invention;

fig. 5 is a schematic diagram of the power display circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution:

And the voltage output end of the MICRO/USB is connected with a diode, and the diode is simultaneously connected with the energy starting input end and the voltage input end of the linear charger. The linear charger is of TP4056 type, and the TMP and GND pins of the TP4056 are both grounded. The model of the triode is 2SC9014, and the model of the diode is 1N 4148. The MOS tube is 8205A in model, and the lithium battery protection plate is DW01 in model.

One specific application of this embodiment is: the utility model discloses MICRO USB passes through TP4056 and provides the power and charges for its inside battery for the alarm instrument, TP4056 is that a complete single section lithium ion battery adopts the linear charger of constant current constant voltage, TP4056 can be fit for USB power and adapter power work, and charging voltage is fixed in 4.2V, when charging current drops to setting value 1/10 after reaching final float charging pressure, TP4056 will terminate the charge cycle automatically. When the input voltage MICRO/USB is taken away, TP4056 automatically enters a low current state, the leakage current of the battery is reduced to be below 2uA, TP4056 can also be placed in a shutdown mode when a power supply is available, the power supply current is lower than 55uA, the battery consumption is reduced, the service life is prolonged, the rechargeable battery is prevented from being replaced, and the rechargeable battery is more environment-friendly.

The working principle of the power supply display circuit is as follows: the terminal voltage after the lithium battery is charged is about 4.2V, the terminal voltage is divided by VDl, VD2 and VD3 and then is sent to two triodes Vl and V2 point by point, the driving voltage of the two LEDs is different because the divided voltage values are different, the driving voltage is reduced along with the reduction of the power supply voltage, when the power supply voltage is 4.2V, the two IEDs emit light to indicate that the electric quantity is sufficient, when the power supply voltage is reduced to 3.6V, the VD5 is extinguished because the voltage drop of 8V cannot be achieved, the indication electric quantity is weakened, when the power supply voltage is reduced to 3.1V again, the VD4 is also gradually extinguished to indicate that the electric quantity is exhausted, the charging is required in time, and the VD4 of the circuit needs to be extinguished completely for a long time and does not worry about.

The working principle of the charging protection circuit is as follows: the lithium battery normally works: when the lithium battery is between 2.5V and 4.3V, the

pins

1 and 3 of the DW01 both output high level, the voltage of the pin 2 is 0V, according to an 8205A principle diagram, the

pins

1 and 3 of the DW01 are respectively connected with the

pins

5 and 4 of the 8205A, and it can be known that the two MOS tubes are both in a conducting state, at the moment, the negative electrode of the lithium battery is in P-communication with a power ground of a singlechip circuit, and the lithium battery normally supplies power. Overcharge protection control: when the lithium battery is charged through the TP4056 circuit, the electric quantity of the lithium battery is increased along with the increase of the charging time, when the voltage of the lithium battery is increased to 4.4V, the DW01 judges that the voltage of the lithium battery is in an overcharged voltage state, 3 pins are immediately controlled to output 0V, no voltage exists in a 8205A chip G1, an MOS (metal oxide semiconductor) tube is cut off, at the moment, the power supply P-of the lithium battery B-and a singlechip circuit is not connected, namely, a lithium battery charging loop is cut off, and charging is stopped. Although the overcharge control switch tube is closed, the direction of the diode inside the overcharge control switch tube is the same as that of the discharge loop, so that the discharge can be carried out after a discharge load is externally connected between P + and P-, when the voltage of the lithium battery is discharged to be lower than 4.3V, the DW01 stops the overcharge protection state, and at the moment, the lithium battery B _ is communicated with the power supply P _ of the singlechip circuit to carry out normal charge and discharge again. Over-discharge protection control: when the lithium battery is discharged by an external load, the voltage of the lithium battery is slowly reduced, and the DW01 detects the voltage of the lithium battery through the R26 resistor. When the voltage is reduced to 2.3V, the DW01 considers that the voltage of the lithium battery is in an over-discharge voltage state, the 1 pin is immediately controlled to output 0V, and no voltage exists in the 8205A chip G2, so that the MOS transistor is cut off. At the moment, the lithium battery B _ is not communicated with the power source P _ of the singlechip circuit, namely, a lithium battery discharging loop is cut off, and discharging is stopped. When a TP4056 circuit is connected for charging, DW01 detects charging voltage through B _ and then controls pin 1 to output high level, and at the moment, lithium battery B _ is communicated with a power supply P _ of the singlechip circuit to perform normal charging and discharging again.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power management circuit for a personal dose alarm comprising a linear charger and a battery, characterized by: the beginning of linear charger can the input and the voltage input end be connected with MICRO USB's voltage output end simultaneously, the battery link end of linear charger is connected with battery charging circuit, battery charging circuit is the parallelly connected charging circuit of circuit and electric capacity, the battery is connected with charge protection circuit and electric quantity display circuit, charge protection circuit includes lithium cell protection board and MOS pipe, the power input end of lithium cell protection board is connected with the battery, the charge control output and the discharge control output of lithium cell protection board are connected with the first grid and the second grid of MOS pipe respectively, the electric quantity display circuit includes diode, LED and triode, the electric quantity display circuit is connected with the battery power, sends into two triodes Vl and V2 point by point after VDl, VD2 and VD3 partial pressure.

2. A power management circuit for a personal dose alarm device according to claim 1, wherein: and the voltage output end of the MICRO/USB is connected with a diode, and the diode is simultaneously connected with the energy starting input end and the voltage input end of the linear charger.

3. A power management circuit for a personal dose alarm device according to claim 1, wherein: the linear charger is TP4056, and the TMP and GND pins of the TP4056 are both grounded.

4. A power management circuit for a personal dose alarm device according to claim 1, wherein: the type of the triode is 2SC9014, and the type of the diode is 1N 4148.

5. A power management circuit for a personal dose alarm device according to claim 1, wherein: the MOS pipe model is 8205A, and the lithium cell protection board model is DW 01.