CN216720976U - Battery power supply equipment and power-off prevention protection circuit thereof - Google Patents
Battery power supply equipment and power-off prevention protection circuit thereof Download PDFInfo
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Abstract
The application provides a battery power supply equipment and prevent electric power down protection circuit thereof, setting through energy storage circuit and converting circuit, when receiving external force impact etc. the condition battery not hard up in the twinkling of an eye and when falling the power supply, accessible energy storage circuit release electric energy and converting circuit carry out voltage conversion in order to replace the battery to provide the required power supply output voltage of power supply load, then automatic switch to battery power supply state when the battery resumes the power on, thus, can avoid the battery to fall the power supply instantaneously and cause equipment work interrupt, discharge in the twinkling of an eye leads to the damage equipment, harm battery life-span scheduling problem, the circuit design is whole simple, high reliability, and need not software control, can avoid increasing software memory consumption, be favorable to improving the operating rate of battery power supply equipment internal system.
Description
Technical Field
The application relates to the technical field of battery power supply, in particular to a battery power supply device and a power-down prevention protection circuit thereof.
Background
Handheld devices mostly use detachable single batteries for power supply due to small volume, and for convenient disassembly and assembly, the batteries are in physical contact with electrodes formed by springs or elastic pole pieces so as to supply power to the devices. Based on the connection mode, when the equipment is subjected to severe vibration, the electrode has elasticity, so that the battery and the electrode can be disconnected instantaneously, the power failure and shutdown phenomenon of the equipment due to no power supply is generated at the moment, and some unexpected loss is caused to equipment users.
At present, there are two main solutions for preventing the power failure problem of products on the market, the first is to reduce the probability of battery disconnection by optimizing or adding a structural design, for example, the power failure prevention battery compartment structure disclosed in CN102572023A, and this method will increase the structural cost; another is to reduce the power consumption of the device through software, so as to reduce the probability of power failure of the device, for example, a power failure prevention protection method disclosed in CN105353862B, but this method also increases the memory consumption of the device, and reduces the program running efficiency.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides a power-down prevention protection circuit and a battery power supply device comprising the power-down prevention protection circuit, wherein the power-down prevention protection circuit can effectively prevent the battery from being damaged and prolonging the service life of the battery and the device due to instantaneous loosening and power down of the battery under the premise of avoiding increasing the cost and the consumption of a memory.
The application provides the following technical scheme:
a power-down prevention protection circuit comprises an energy storage circuit connected with a battery and a conversion circuit connected with the energy storage circuit;
the energy storage circuit is connected among the anode and the cathode of the battery and the conversion circuit and used for storing electric energy in the process that the battery supplies power to a power supply load and releasing the electric energy when the battery and the power supply load are interrupted;
the conversion circuit is used for converting the electric energy released by the energy storage circuit into power supply output voltage required by the power supply load.
In some embodiments, the power down protection circuit further comprises a reverse connection prevention circuit connected between the battery and the tank circuit;
the reverse connection preventing circuit comprises a switch element connected between the positive electrode and the negative electrode of the battery and the energy storage circuit, when the battery is in a forward installation state, the switch element conducts the battery and the power supply load, and when the battery is in a reverse installation state, the switch element disconnects the battery and the power supply load.
In some embodiments, the switching element comprises a PMOS transistor, the drain of the PMOS transistor is connected to the positive pole of the battery, the source of the PMOS transistor is connected to the energy storage circuit, and the gate of the PMOS transistor is connected to the negative pole of the battery;
or the switch element comprises an NMOS transistor, the source electrode of the NMOS transistor is connected with the negative electrode of the battery, the drain electrode of the NMOS transistor is connected with the energy storage circuit, and the grid electrode of the NMOS transistor is connected with the positive electrode of the battery;
or, the switching element comprises a diode, the anode of the diode is connected with the anode of the battery, and the cathode of the diode is connected with the energy storage circuit.
In some embodiments, a bidirectional voltage regulator tube is further arranged between the grid electrode and the source electrode of the PMOS transistor.
In some embodiments, the energy storage circuit includes at least one energy storage capacitor connected in parallel with the anti-reverse circuit.
In some embodiments, the conversion circuit comprises a dc boost circuit;
the input end of the direct current booster circuit is connected with the energy storage circuit, and the output end of the direct current booster circuit outputs the power supply output voltage.
In some embodiments, the dc boost circuit includes a power chip, an inductor connected between a power switch terminal of the power chip and the tank circuit, and a feedback circuit connected to a voltage output terminal of the power chip;
the voltage input end of the power supply chip is the input end of the direct current booster circuit, the voltage output end of the power supply chip is the output end of the direct current booster circuit, and the grounding end of the power supply chip is connected with the negative electrode of the battery;
the first end of the inductor is connected with the energy storage circuit, and the second end of the inductor is connected with the power switch end of the power supply chip;
the feedback circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor which are connected between a voltage output end and a grounding end of the power chip in series, and a junction between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with the feedback end of the power chip.
In some embodiments, the dc boost circuit further includes a pull-up resistor connected between a voltage input terminal and an enable terminal of the power chip, and a node between the pull-up resistor and the voltage input terminal is connected to the second terminal of the inductor.
A battery power supply device comprises a battery installation position, a battery arranged on the battery installation position and any one of the power-off prevention protection circuits;
and connecting terminals for respectively connecting with the positive electrode and the negative electrode of the battery are arranged at two ends of the battery mounting position.
In some embodiments, the battery operated device further comprises a switch control circuit;
the switch control circuit is connected with the conversion circuit and used for controlling the connection and disconnection between the power supply output end of the conversion circuit and the power supply load of the battery power supply equipment.
It is thus clear from the above that, in the protection circuit and the battery power supply unit that prevent falling electric power that this application provided, through the setting of tank circuit and converting circuit, when receiving external force impact etc. the battery becomes flexible in the twinkling of an eye and when falling the power supply, accessible tank circuit release electric energy and converting circuit carry out voltage conversion in order to replace the battery to provide the required power supply output voltage of power supply load, then automatic switch to battery power supply state when the battery resumes to go up, so, can avoid the battery to fall the power supply instantaneously and cause equipment work interrupt, discharge in the twinkling of an eye and lead to the damage equipment, harm battery life-span scheduling problem, circuit design is whole simple, high reliability, and need not software control, can avoid increasing software memory consumption, be favorable to improving the running rate of battery power supply unit internal system.
Drawings
Fig. 1 is a block diagram of a power-down prevention protection circuit according to some embodiments of the present application;
fig. 2 is a block diagram of a power-down prevention protection circuit according to another embodiment of the present application;
fig. 3 is a schematic circuit structure diagram of a power-down protection circuit according to some embodiments of the present application;
fig. 4 is a schematic structural diagram of a battery-powered device according to some embodiments of the present application;
fig. 5 is a schematic structural diagram of a battery-powered device according to another embodiment of the present application.
Detailed Description
The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments of the specification.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of implementations of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as meaning directly connected or indirectly connected through an intermediate medium, and as meaning communicating between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Fig. 1 is a block diagram of a power-down prevention protection circuit according to the present application, which is mainly applied to a battery-powered device. The power-down prevention protection circuit includes a tank circuit 12 connected to the battery, and a converter circuit 13 connected to the tank circuit 12. The energy storage circuit 12 is connected between the positive electrode and the negative electrode of the battery and the conversion circuit 13, and is used for storing electric energy in the process that the battery supplies power to the power supply load and releasing the electric energy when the battery and the power supply load are interrupted; the conversion circuit 13 is configured to convert the electric energy released by the energy storage circuit 12 into a supply output voltage required by the supply load.
Here, the battery is a power supply battery of the battery-powered device, and is a single battery or a plurality of batteries connected in series. The battery may be a dry battery such as a lithium battery, and is generally detachably mounted in the battery-powered device. The battery powered device is a handheld device with a relatively low supply voltage (e.g., 5V).
It is thus clear from the above that, in the protection circuit and the battery power supply unit that prevent falling electric power that this application provided, through the setting of tank circuit and converting circuit, when receiving external force impact etc. the battery becomes flexible in the twinkling of an eye and when falling the power supply, accessible tank circuit release electric energy and converting circuit carry out voltage conversion in order to replace the battery to provide the required power supply output voltage of power supply load, then automatic switch to battery power supply state when the battery resumes to go up, so, can avoid the battery to fall the power supply instantaneously and cause equipment work interrupt, discharge in the twinkling of an eye and lead to the damage equipment, harm battery life-span scheduling problem, circuit design is whole simple, high reliability, and need not software control, can avoid increasing software memory consumption, be favorable to improving the running rate of battery power supply unit internal system.
In some embodiments, as shown in fig. 2, the power-down prevention protection circuit further includes a reverse connection prevention circuit 11 connected between the battery and the energy storage circuit 12. The anti-reverse connection circuit 11 includes a switching element (not shown in fig. 2) connected between the positive and negative electrodes of the battery and the tank circuit 12. When the battery is in a forward mounting state, the switching element conducts the battery and the power supply load, and when the battery is in a reverse mounting state, the switching element disconnects the battery and the power supply load. It is thus clear that in the protection circuit that prevents falling electric that this application provided, through the setting of preventing reverse connection circuit, can be when the reverse installation of battery will the battery with automatic disconnection between the power supply load avoids the battery to connect conversely and causes the problem of power supply short circuit.
In some embodiments, the power-down prevention protection circuit further includes a circuit substrate, and the reverse connection prevention circuit 11, the energy storage circuit 12, and the conversion circuit 13 are disposed on the circuit substrate, so as to form a power-down prevention protection circuit board. The circuit board is also provided with a positive electrode connecting terminal connected with the positive electrode of the battery and a negative electrode connecting terminal connected with the negative electrode of the battery. On the circuit board, an anti-reverse connection circuit 11 is connected between the positive connection terminal and the negative connection terminal to be connected to the positive and negative electrodes of the battery through the positive connection terminal and the negative connection terminal.
The battery is mounted in the reverse direction, that is, the positive electrode of the battery is connected to the negative electrode of the battery in the electrode connection terminal, and the negative electrode of the battery is connected to the positive electrode of the battery in the electrode connection terminal. The positive pole of the battery is connected with the positive pole of the battery in the electrode connecting terminals, and the negative pole of the battery is connected with the negative pole of the battery in the electrode connecting terminals, so that the battery is correctly connected with the electrode connecting terminals, and in this case, the battery can provide power supply output voltage for the load through the power failure prevention protection circuit.
The switching element in the reverse connection preventing circuit 12 may include any one of a PMOS transistor, an NMOS transistor, or a diode. The PMOS transistor is a P-type Metal Oxide Semiconductor, and the corresponding english expression is positive channel Metal Oxide Semiconductor, and the NMOS transistor is an N-type Metal Oxide Semiconductor, and the corresponding english expression is Negative channel Metal Oxide Semiconductor.
Specifically, in some embodiments, the switching element of the reverse connection preventing circuit 12 includes a PMOS transistor, a drain of the PMOS transistor is connected to the positive electrode of the battery, and a source of the PMOS transistor is connected to the energy storage circuit 13, for example, when the energy storage circuit 13 is formed by an energy storage capacitor, a source of the PMOS transistor is connected to the positive electrode of the energy storage capacitor, and a gate of the PMOS transistor is connected to the negative electrode of the battery.
Specifically, in some embodiments, the switching element of the reverse connection preventing circuit 12 includes an NMOS transistor, a source of the NMOS transistor is connected to the negative electrode of the battery, a drain of the NMOS transistor is connected to the energy storage circuit 13, for example, when the energy storage circuit 13 is formed by an energy storage capacitor, a source of the NMOS transistor is connected to the negative electrode of the energy storage capacitor, and a gate of the NMOS transistor is connected to the positive electrode of the battery.
In some embodiments, the switching element of the reverse connection preventing circuit 12 includes a diode, an anode of the diode is connected to the anode of the battery, and a cathode of the diode is connected to the energy storage circuit 13, for example, when the energy storage circuit 13 is formed by an energy storage capacitor, the cathode of the diode is connected to the positive terminal of the energy storage capacitor.
In order to further reduce the power consumption of the power-down protection circuit, in some embodiments, the present application selects a circuit including a PMOS transistor to form the reverse-connection prevention circuit 11, specifically as shown in fig. 3, the drain D of the PMOS transistor Q1 is connected to the positive electrode of the battery of the circuit substrate 11, the source S of the PMOS transistor Q1 is connected to the positive electrode of the energy storage circuit 13, and the gate G of the PMOS transistor Q1 is connected to the negative electrode of the battery. In addition, the reverse connection preventing circuit 12 further includes a resistor R1, and the resistor R1 is connected between the gate G of the PMOS transistor and the negative electrode of the battery. A body diode is arranged between the drain electrode and the source electrode S of the PMOSQ1, the anode of the body diode is the drain electrode of the PMOS transistor Q1, the cathode of the body diode is the source electrode S of the PMOS transistor Q1, and a bidirectional voltage regulator tube is further arranged between the grid electrode G and the source electrode S of the PMOS transistor Q1.
When the polarity between the battery and the electrode connecting terminal is reversed, the PMOS transistor is disconnected, the power supply loop of the power supply load is disconnected, otherwise, the PMOS transistor is switched on, and the battery supplies power to the load (such as a system function circuit, a switch control circuit and the like in the battery power supply equipment) through the power-off prevention protection circuit 1
In some embodiments, the energy storage circuit 12 comprises at least one energy storage capacitor, the first end of the energy storage capacitor is the positive terminal of the energy storage circuit 12, the positive terminal is connected to the positive terminal of the battery, the second end of the energy storage capacitor is the negative terminal of the energy storage circuit 12, and the negative terminal is connected to the negative terminal of the battery. Specifically, as shown in fig. 3, in this embodiment, the number of the energy storage capacitors is 4, and the energy storage capacitors are divided into C1, C2, C3, and C4 which are connected in parallel. The positive terminal of the energy storage circuit 12 is the higher voltage terminal of the energy storage capacitor relative to the other terminal, and the other terminal is the negative terminal of the energy storage circuit 12.
In some embodiments, the conversion circuit 13 is a dc boost circuit, an input terminal of which is connected to the positive terminal of the energy storage circuit 12, and an output terminal of which outputs a supply output voltage required by the battery-powered device.
With continued reference to fig. 3, in some embodiments, the dc boost circuit includes a power chip U1, an inductor L1 connected between the power switch terminals (SW1, SW2) of the power chip U1 and the energy storage circuit 12, and a feedback circuit connected to the voltage output terminal VOUT of the power chip U1. The voltage input end VI N of the power supply chip U1 is an input end of the direct current booster circuit, the voltage output end VOUT is an output end of the direct current booster circuit, and a grounding end (an analog ground AGNP, and a power ground PGND is connected with a negative electrode of a battery.A first end of an inductor L1 is connected with the energy storage circuit 12, a second end is connected with a power switch end of the power supply chip U1. the feedback circuit comprises a first voltage-dividing resistor R3 and a second voltage-dividing resistor R4 which are connected between the voltage output end VOUT and the grounding end of the power supply chip U1 in series, a junction between the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4 is connected with a feedback end FB of the power supply chip U1. furthermore, the direct current booster circuit further comprises a pull-up resistor R2 which is connected between the voltage input end VI N and an enable end EN of the power supply chip U1, and a junction between the pull-up resistor and the voltage input end VI N is connected with a second end of the inductor L1.
In some embodiments, the dc boost circuit further includes an input filter circuit connected to the voltage input of the power chip U1 and an output filter circuit connected to the voltage output of the power chip U1. The input filter circuit at least includes an input filter capacitor, such as capacitors C5 and C6 shown in fig. 3, a first end of the input filter capacitor is connected to the voltage input terminal VI N of the power chip U1, and a second end of the input filter capacitor is connected to the ground terminal. The output filter circuit at least includes an output filter capacitor, such as capacitors C7, C8, and C9 in fig. 3, the first end of the output filter capacitor is connected to the voltage output terminal VOUT of the power chip U1, and the second end of the output filter capacitor is connected to the ground terminal.
The working process and the power down protection principle of the power down protection circuit provided by the present application will be specifically explained with reference to the embodiment shown in fig. 2.
The reverse connection preventing circuit 12 forms a reverse connection preventing protection circuit through the MOS transistor, so that normal power supply can be guaranteed when the battery is correctly installed, and equipment cannot be damaged when the battery is reversely installed. The energy storage circuit 13 is composed of tantalum capacitors with the number of N and the capacitance value of C, and the stored electric energy can ensure that the battery power supply equipment can still work normally at the moment when the battery is disconnected. The quantity N and the capacity value C are determined according to the power consumption P of the battery power supply equipment, the battery off time T during severe vibration, the minimum discharge voltage UL of the battery, the minimum input voltage VL of the direct current booster circuit and the conversion efficiency eta of the direct current booster circuit, and the specific determination relationship is as follows:
C*(UL-VL)/2*N*η≥P*T
the conversion circuit 14 is a direct current boost circuit, and specifically comprises a DC-DC power chip U1 and its peripheral circuit, and when the battery works normally (when the polarity of the battery is not reversed), the conversion circuit 14 can convert the battery power into a stable power supply voltage to supply power to the battery power supply device; when the battery power supply equipment encounters severe vibration, at the moment that the battery is separated from the electrode connecting terminal, the conversion circuit 14 converts the electric energy in the energy storage circuit 13 into power supply voltage to continuously supply power to the battery power supply equipment, and the battery power supply is used for supplying power to the battery power supply equipment until the battery contacts the electrode. The minimum value VL of the input voltage of the conversion circuit 14 is lower than a preset value, so that the electric energy stored by the energy storage circuit 13 can be fully utilized, the equipment can be ensured to have enough time to continue to work normally at the moment that the battery is separated from the electrode connecting terminal, and the power failure of the battery power supply equipment is avoided.
With continued reference to fig. 2, battery BAT1 is of type CR123A, and has a Power supply range UL-UH output Power Li _ Power +, and Li _ Power is output through an anti-reverse connection circuit. The anti-reverse-connection circuit is composed of a MOS transistor Q1 and a resistor R1, wherein a PIN PIN3 of a Q1 is connected with Li _ Power +, a PIN PIN2 is connected with Li _ Power, and a PIN PIN1 is connected with the cathode of a battery through the resistor R1. When the battery is normally installed, the voltage VG of a PIN PIN1(G pole) is 0, the direction of a parasitic diode in a Q1 is from a D pole to an S pole, and the PIN PIN2(S pole) has voltage, so VS >0, so VGS <0, at the moment, Q1 is conducted, current is allowed to pass, and the device can normally work; when the battery is reversely mounted, VG >0, VS equals 0, so VGS > O, at the moment, Q1 is not conducted, the current is cut off, and therefore the device cannot be damaged.
After passing through the reverse connection prevention circuit, the Power source Li _ Power is connected with the energy storage circuit in parallel, the energy storage circuit consists of a plurality of tantalum capacitors, the positive electrodes of the tantalum capacitors are connected with the Li _ Power, and the negative electrodes of the tantalum capacitors are grounded. The energy storage circuit can store total electric energy E ═ CV2/2 × N, where C is the capacitance of a single tantalum capacitor, V is the Li _ Power voltage, and N is the number of tantalum capacitors.
And then the Power Li _ Power enters the conversion circuit, and outputs a stabilized voltage Power supply Sys _ Power through the conversion circuit to supply Power to the following circuit, so that the normal work of the equipment is ensured. The voltage range allowed to be input by the conversion circuit is VL-VH, and the power conversion efficiency is eta. The circuit is centered on the power chip U1 and includes peripheral circuits.
The peripheral circuit comprises an inductor L1, a capacitor C5, a capacitor C6 and a resistor R2. And a PIN PIN8 of the Power supply chip U1 is connected with Li _ Power, an inductor L1 is connected between the Li _ Power and the Power supply chip U1 after being connected with a resistor R2 in parallel, and when the Power supply chip U1 is specifically connected, one end of an inductor L1 is connected with one end of the resistor R2 in parallel, and the other end of the inductor L1 is connected with the PIN PIN6 and the PIN7 of the Power supply chip U1 to serve as a peripheral inductor of the Power supply chip U1. The other end of the resistor R2 is connected to the PIN5 of the power chip U1, and serves as a pull-up resistor for the PIN6 of the power chip U1. Capacitors C5 and C6 have one end connected to Li _ Power and the other end connected to ground, and serve as filter capacitors when Li _ Power enters Power chip U1.
The peripheral circuit also comprises resistors R3 and R4, and capacitors C7, C8 and C9. One end of the resistor R3 is connected in parallel with the PIN PIN3 and the PIN4 of the Power chip U1, then is connected with the Sys _ Power, the other end of the resistor R3 is connected with the PIN PIN2 of the Power chip U1, one end of the resistor R4 is connected with the PIN PIN2 of the Power chip U1, the other end of the resistor R4 is grounded, and the resistors R3 and R4 serve as feedback network resistors of the Power chip U1. The capacitors C7, C8 and C9 are used as filter capacitors for the output voltage Sys _ Power of the Power chip U1, and one end of each capacitor is connected to Sys _ Power, and the other end of each capacitor is grounded. PINs PIN1 and PIN9 of the power chip U1 are both grounded.
When the device is subjected to severe vibration, the battery is separated from the electrode, namely the BAT1 is disconnected from the circuit, Li _ Power + is equal to 0, the device is powered by the electric energy stored in the energy storage circuit, the voltage V of Li _ Power is gradually reduced due to the consumption of the electric energy,
until the voltage V of Li _ Power is equal to the minimum input voltage VL of the converter circuit, the energy storage circuit can provide the electric energy E ═ C (V-VL)/2 × N · η for the device. In the example scheme, VL is 0.5V, so that the scheme can fully utilize the electric energy stored in the energy storage circuit to prolong the power supply time of the energy storage circuit and reduce the power failure probability of the device.
Therefore, the power-off prevention protection circuit provided according to the embodiment of the application has the following beneficial effects:
1. only the conversion circuit is added to provide a stabilized voltage power supply to supply power to the equipment, so that the electric energy stored by the energy storage circuit can be effectively utilized;
2. the impact power failure of the equipment is avoided only by circuit design without adding structural design;
3. the cost can be reduced; software control is not needed, the software memory consumption is low, and the running speed is improved.
In addition, in some embodiments, the present application further provides a battery-powered device, and specifically, as shown in fig. 4, the battery-powered device provided in the present application includes a battery mounting location 3, a battery 2 mounted on the battery mounting location 3, and a power-down prevention protection circuit 1 according to any embodiment of the present application. The battery mounting position 3 is provided at both ends with connection terminals (not shown in fig. 4) for connecting to the positive and negative electrodes of the battery 2, respectively, and the connection terminals are physically connected to the positive and negative electrodes of the battery, for example, by elastic pieces or springs. The battery is detachable from the battery mounting site 3. The battery mounting position 3 is a box for mounting the battery 2 or a carrier of the battery 2. The battery 2 supplies power to a power supply load 4 in the battery power supply equipment through the power-off prevention protection circuit 1, the power supply load 4 is a system function module in the battery power supply equipment, and when the system function module works normally, the battery power supply equipment realizes corresponding functions.
In some embodiments, as shown in fig. 5, the battery powered device further comprises a switch control circuit 5, and the switch control circuit 5 is connected to the converting circuit 14 for controlling the connection and disconnection between the power supply output terminal of the converting circuit 14 and the power supply load of the battery powered device.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The power-off prevention protection circuit is characterized by comprising an energy storage circuit connected with a battery and a conversion circuit connected with the energy storage circuit;
the energy storage circuit is connected among the anode and the cathode of the battery and the conversion circuit and used for storing electric energy in the process that the battery supplies power to a power supply load and releasing the electric energy when the battery and the power supply load are interrupted;
the conversion circuit is used for converting the electric energy released by the energy storage circuit into power supply output voltage required by the power supply load.
2. The power down prevention protection circuit of claim 1, further comprising an anti-reverse circuit connected between the battery and the tank circuit;
the reverse connection preventing circuit comprises a switch element connected between the positive electrode and the negative electrode of the battery and the energy storage circuit, when the battery is in a forward installation state, the switch element conducts the battery and the power supply load, and when the battery is in a reverse installation state, the switch element disconnects the battery and the power supply load.
3. The power-down prevention protection circuit according to claim 2, wherein the switching element comprises a PMOS transistor, a drain of the PMOS transistor is connected with a positive electrode of the battery, a source of the PMOS transistor is connected with the energy storage circuit, and a gate of the PMOS transistor is connected with a negative electrode of the battery;
or the switch element comprises an NMOS transistor, the source electrode of the NMOS transistor is connected with the negative electrode of the battery, the drain electrode of the NMOS transistor is connected with the energy storage circuit, and the grid electrode of the NMOS transistor is connected with the positive electrode of the battery;
or, the switching element comprises a diode, the anode of the diode is connected with the anode of the battery, and the cathode of the diode is connected with the energy storage circuit.
4. The power-down prevention protection circuit of claim 3, wherein a bidirectional voltage regulator tube is further arranged between the grid electrode and the source electrode of the PMOS transistor.
5. The power down prevention protection circuit of claim 2, wherein the energy storage circuit comprises at least one energy storage capacitor connected in parallel with the reverse connection prevention circuit.
6. The power down prevention protection circuit of claim 1, wherein the conversion circuit comprises a dc boost circuit;
the input end of the direct current booster circuit is connected with the energy storage circuit, and the output end of the direct current booster circuit outputs the power supply output voltage.
7. The power-down prevention protection circuit of claim 6, wherein the DC boost circuit comprises a power chip, an inductor connected between a power switch end of the power chip and the energy storage circuit, and a feedback circuit connected with a voltage output end of the power chip;
the voltage input end of the power supply chip is the input end of the direct current booster circuit, the voltage output end of the power supply chip is the output end of the direct current booster circuit, and the grounding end of the power supply chip is connected with the negative electrode of the battery;
the first end of the inductor is connected with the energy storage circuit, and the second end of the inductor is connected with the power switch end of the power supply chip;
the feedback circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor which are connected between a voltage output end and a ground end of the power supply chip in series, and a junction between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with the feedback end of the power supply chip.
8. The power down prevention protection circuit of claim 7, wherein the dc boost circuit further comprises a pull-up resistor connected between a voltage input terminal and an enable terminal of the power chip, and a junction between the pull-up resistor and the voltage input terminal is connected to the second terminal of the inductor.
9. A battery-powered device comprising a battery mounting location, a battery mounted on the battery mounting location, and the power-down prevention protection circuit of any one of claims 1 to 8;
and connecting terminals for respectively connecting with the positive electrode and the negative electrode of the battery are arranged at two ends of the battery mounting position.
10. The battery-powered device of claim 9, further comprising a switch control circuit;
the switch control circuit is connected with the conversion circuit and used for controlling the connection and disconnection between the power supply output end of the conversion circuit and the power supply load of the battery power supply equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123447481.5U CN216720976U (en) | 2021-12-30 | 2021-12-30 | Battery power supply equipment and power-off prevention protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123447481.5U CN216720976U (en) | 2021-12-30 | 2021-12-30 | Battery power supply equipment and power-off prevention protection circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN216720976U true CN216720976U (en) | 2022-06-10 |
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|---|---|---|---|
| CN202123447481.5U Active CN216720976U (en) | 2021-12-30 | 2021-12-30 | Battery power supply equipment and power-off prevention protection circuit thereof |
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| Country | Link |
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| CN (1) | CN216720976U (en) |
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Assignee: Yantai Airui Photo-Electric Technology Co.,Ltd. Assignor: INFIRAY TECHNOLOGIES CO.,LTD. Contract record no.: X2024980006468 Denomination of utility model: Battery powered equipment and its anti power-off protection circuit Granted publication date: 20220610 License type: Common License Record date: 20240617 |