CN212646801U

CN212646801U - Voltage detection circuit and electronic device

Info

Publication number: CN212646801U
Application number: CN202020334233.6U
Authority: CN
Inventors: 辛士民
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2021-03-02
Anticipated expiration: 2030-03-17

Abstract

The utility model provides a voltage detection circuit and electronic equipment, this voltage detection circuit includes: the device comprises a switch module, a detection module and a voltage supply module; the control end of the switch module is connected with the power supply module, the input end of the switch module is connected with the anode of the battery, the output end of the switch module is connected with the first input end of the detection module, and the second input end of the detection module is connected with the voltage supply module; the switch module is used for connecting and connecting the positive electrode of the battery with the first input end of the detection module when the power supply module provides charging voltage for the battery, and disconnecting the positive electrode of the battery from the first input end of the detection module when the power supply module does not provide charging voltage for the battery; and the detection module is used for detecting whether the voltage of the positive electrode of the battery is greater than or equal to the first overvoltage protection voltage or not according to the reference voltage provided by the voltage providing module. The utility model provides a voltage detection circuit and electronic equipment can reduce the consumption to battery power, improves the duration of a journey ability of battery.

Description

Voltage detection circuit and electronic device

Technical Field

The utility model relates to a voltage detection technique especially relates to a voltage detection circuit and electronic equipment.

Background

A sound box is a device that can convert an audio signal into sound. In order to facilitate users to use the sound box outdoors, a movable sound box (mobile sound box for short) is produced. Common mobile sound boxes include: portable sound box, pull rod sound box, etc.

The mobile sound box is internally provided with a battery, and a user can charge the battery, so that the mobile sound box can supply power to the mobile sound box when the mobile sound box works. At present, a voltage detection circuit of a Micro Controller Unit (MCU) is disposed at two ends of a battery of many mobile speakers, and is used to detect the voltage of the battery. When the MCU voltage detection circuit judges that the voltage of the battery is overvoltage based on the detected battery voltage, namely the battery is in an overcharged state, the MCU voltage detection circuit can perform overvoltage protection on the battery so as to avoid the conditions of battery internal pressure rise, battery deformation, liquid leakage and the like caused by battery overcharge.

However, the above-mentioned manner of detecting the voltage of the battery may result in poor endurance of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model provides a voltage detection circuit and electronic equipment for solve the current voltage detection circuit on the removal audio amplifier and lead to the relatively poor technical problem of battery duration of removal audio amplifier.

In a first aspect, the present invention provides a voltage detection circuit, which includes: the device comprises a switch module, a detection module and a voltage supply module; wherein the content of the first and second substances,

the control end of the switch module is connected with the power supply module, the input end of the switch module is connected with the anode of the battery, the output end of the switch module is connected with the first input end of the detection module, and the second input end of the detection module is connected with the voltage supply module.

The switch module is used for connecting and connecting the positive electrode of the battery with the first input end of the detection module when the power supply module provides charging voltage for the battery, and disconnecting the positive electrode of the battery from the first input end of the detection module when the power supply module does not provide charging voltage for the battery;

and the detection module is used for detecting whether the voltage of the positive electrode of the battery is greater than or equal to the first overvoltage protection OVP voltage or not according to the reference voltage provided by the voltage providing module.

Optionally, the voltage detection circuit further includes: a feedback module; the input end of the feedback module is connected with the output end of the detection module, and the output end of the feedback module is connected with the first input end of the detection module.

And the feedback module is used for recharging the high level output by the detection module when the voltage of the battery anode is greater than or equal to the first OVP voltage to the first input end of the detection module.

And the detection module is also used for outputting a low level when the voltage of the battery anode is smaller than a second OVP voltage, wherein the second OVP voltage is smaller than the first OVP voltage.

Optionally, the feedback module includes: a diode and a first resistor.

The positive pole of the diode is the input end of the feedback module, the negative pole of the diode is connected with one end of the first resistor, and the other end of the first resistor is the output end of the feedback module.

Optionally, the voltage detection circuit further includes: a voltage division module; the output end of the switch module is connected with the input end of the voltage division module, and the output end of the voltage division module is connected with the first input end of the detection module.

And the voltage division module is used for dividing the voltage of the battery anode.

And the detection module is specifically used for detecting whether the voltage of the positive electrode of the battery is greater than or equal to the first overvoltage protection OVP voltage or not according to the reference voltage provided by the voltage providing module and the divided voltage of the positive electrode of the battery.

Optionally, the voltage dividing module includes: a second resistor, a third resistor, and a fourth resistor.

One end of the second resistor is an input end of the voltage division module, and the other end of the second resistor is an output end of the voltage division module.

The other end of the second resistor is respectively connected with one end of the third resistor and one end of the fourth resistor, and the other end of the third resistor and the other end of the fourth resistor are grounded.

Optionally, the switch module includes: a first switch and a second switch.

The first end of the first switch is the control end of the switch module, the second end of the first switch is connected with the first end of the second switch, and the third end of the first switch is grounded.

The second end of the second switch is the input end of the switch module, and the third end of the second switch is the output end of the switch module.

Optionally, the first switch is a triode.

The first end of the first switch adopts the base electrode of the triode, the second end of the first switch adopts the collector electrode of the triode, and the third end of the first switch adopts the emitter electrode of the triode.

Optionally, the second switch is a triode.

The first end of the second switch adopts the base electrode of the triode, the second end of the first switch adopts the emitting electrode of the triode, and the third end of the first switch adopts the collector electrode of the triode.

Optionally, the detection module includes: an operational amplifier.

The non-inverting input end of the operational amplifier is a first input end of the detection module, the inverting input end of the operational amplifier is a second input end of the detection module, and the output end of the operational amplifier is an output end of the detection module.

In a second aspect, the present invention further provides an electronic device, which includes a battery, a power supply module for supplying power to the battery, and a voltage detection circuit according to any one of the above first aspects.

The utility model provides a voltage detection circuit and electronic equipment, voltage detection circuit just can carry out battery voltage's detection when power module is battery powered, when power module is not battery powered, can not carry out battery voltage's detection. Therefore, the utility model provides a voltage detection circuit compares current real-time detection battery voltage's voltage detection circuit, can reduce voltage detection circuit to the consumption of battery power, has improved the duration of a journey ability of battery.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic structural view of a pull-rod speaker;

FIG. 2 is a schematic diagram of a conventional battery voltage detection circuit;

fig. 3 is a schematic diagram of a voltage detection circuit according to the present invention;

fig. 4 is a schematic diagram of another voltage detection circuit provided by the present invention;

fig. 5 is a schematic diagram of another voltage detection circuit provided by the present invention;

fig. 6 is a schematic diagram of another voltage detection circuit provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Taking a pull rod sound box in a mobile sound box as an example, fig. 1 is a schematic structural diagram of a pull rod sound box. As shown in fig. 1, in order to facilitate the user to use the pull rod sound box outdoors, a battery (not shown) is built in the pull rod sound box.

The battery is used for supplying power to the pull rod sound box when the pull rod sound box works. The battery as referred to herein is a rechargeable battery having a limited number of charges. In some embodiments, the battery may also be referred to as a rechargeable battery. In the present invention, the battery and the rechargeable battery are equivalent, and the following embodiments are described by taking the battery as an example.

When the battery of the damper box is charged, if the battery is continuously charged after the full charge state is reached, the battery may be overcharged. The overcharge of the battery may cause an increase in the internal pressure of the battery, deformation of the battery, leakage of the liquid, etc., and the performance of the battery may be significantly degraded and deteriorated. Therefore, in order to avoid overcharging the battery, the above-mentioned draw bar sound box further incorporates an MCU voltage detection circuit (not shown in the figure).

Fig. 2 is a schematic diagram of a conventional battery voltage detection circuit, and as shown in fig. 2, one end of the MCU voltage detection circuit is connected to the positive electrode of the battery, and the other end is connected to the negative electrode of the battery. The MCU voltage detection circuit can detect the voltage of the battery in real time and judge whether the voltage of the battery is overvoltage or not based on the detected voltage of the battery. If the voltage of the battery is not over-voltage, which indicates that the battery is not in an over-charged state, the MCU voltage detection circuit may not perform any processing. If the voltage of the battery is over-voltage, the battery is in an over-charged state, and the MCU voltage detection circuit can perform over-voltage protection on the battery.

For example, the MCU voltage detection circuit may disconnect the charging path for charging the battery; or an indicator light with a fully charged battery is arranged on the pull rod sound box, and the MCU voltage detection circuit can control the indicator light to be on constantly; or, a display screen is arranged on the pull rod sound box, and the MCU voltage detection circuit can display prompt information such as that the battery is fully charged through the display screen; or the MCU voltage detection circuit can send out an alarm prompt tone and the like when the charging is full.

However, even if the battery is in an uncharged state, for example, when the battery supplies power to the mobile speaker, or when the mobile speaker is not in standby operation, the MCU voltage detection circuit may still detect the voltage of the battery in real time. Because the MCU voltage detection circuit consumes the power of the battery when in work, the mode of detecting the voltage of the battery can cause the endurance of the battery to be poor.

When the battery is not charged or the battery is in standby and does not work, the battery does not have overvoltage, and the voltage of the battery does not need to be detected. Therefore, the utility model provides a voltage detection circuit that only when the battery charges, just can carry out the detection to the voltage of battery compares current real-time detection battery voltage's voltage detection circuit, can reduce the consumption of voltage detection circuit to battery power, has improved the duration of a journey ability of battery.

It should be understood that the utility model provides a voltage detection circuit can be applicable to arbitrary electronic equipment that is provided with the battery, for example, remove audio amplifier, terminal, intelligent wearing equipment etc.. The terminal may be, for example, a mobile phone (mobile phone), a tablet (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, or the like.

The technical solution of the present invention will be described in detail with reference to specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 3 is a schematic diagram of a voltage detection circuit provided by the present invention. As shown in fig. 3, the voltage detection circuit may include: the device comprises a switch module, a detection module and a voltage supply module.

And the power supply module is used for providing charging voltage for the battery. The magnitude of the charging voltage can be specifically determined according to the requirement of the battery on the charging voltage. For example, the power supply module may be a module that converts alternating current to direct current, for example. It should be understood that the power supply module may directly provide a charging voltage for the battery, or may perform voltage conversion on the output voltage of the power supply module through other modules or other conversion circuits, and then provide the converted output voltage for the battery, so as to implement a charging function. Alternatively, in some embodiments, the power supply module (assumed as power supply module a) to which the control terminal of the switch module is connected and the power supply module (assumed as power supply module B) that provides the charging voltage for the battery may be two independent modules, but the voltage output by the power supply module a may indirectly reflect whether the power supply module B provides the charging voltage for the battery. For example, the power supply module a and the power supply module B are both connected to a general power supply module of the electronic device (i.e., a module for supplying power to all devices of the electronic device, which is used for connecting to an external power supply of the electronic device).

And the switch module is used for connecting and connecting the positive electrode of the battery with the first input end of the detection module when the power supply module provides charging voltage for the battery, and disconnecting the positive electrode of the battery from the first input end of the detection module when the power supply module does not provide charging voltage for the battery.

And the voltage providing module is used for providing a reference voltage. For example, the voltage providing module may be a Direct current-Direct current converter (DCDC) converter, or the voltage providing module may be a constant voltage module (e.g., 431 constant voltage module), etc. In a specific implementation, the DCDC converter may be connected to the power supply module, and configured to convert a voltage of the power supply module into a reference voltage; alternatively, the voltage providing module may be connected to the battery, and configured to convert the voltage provided by the battery into a reference voltage; or the voltage supply module is connected with other modules capable of realizing power supply function to obtain the reference voltage. It should be understood that the magnitude of the reference voltage outputted by the voltage providing module can be set according to actual requirements.

And the detection module is used for detecting whether the voltage of the anode of the battery is greater than or equal to a first Overvoltage Protection (OVP) voltage or not according to the reference voltage. The first OVP voltage may be determined according to an overvoltage voltage of the battery.

In this embodiment, the on and off of the switch module is controlled by whether the power supply module provides a charging voltage for the battery. When the power supply module is not used for supplying power to the battery, the switch module cannot conduct the connection between the positive electrode of the battery and the first input end of the detection module, and cannot trigger the detection module to work. At this time, since the detection module is not operated, that is, the path between the voltage supply module and the detection module is in an open state, the voltage supply module is not operated. When the power supply module supplies power to the battery, the switch module conducts the connection between the positive electrode of the battery and the first input end of the detection module, so that the voltage of the positive electrode of the battery can be input to the first input end of the detection module, and the detection module is triggered to detect whether the voltage of the positive electrode of the battery is larger than the first OVP voltage or not.

When the voltage of the positive electrode of the battery has not reached (i.e., is less than) the first OVP voltage, the voltage at the first input terminal of the detection module may be lower than the reference voltage, which indicates that the battery has not been over-voltage (i.e., the battery has not been fully charged), and at this time, the detection module may output a low level, so as to indicate that the battery has not been over-voltage. When the voltage of the positive electrode of the battery is greater than or equal to the first OVP voltage, the voltage of the first input end of the detection module is greater than or equal to the reference voltage, which indicates that the battery is over-voltage (i.e., the battery is fully charged), and at this time, the detection module may output a high level, so as to indicate that the battery is over-voltage through the high level.

It should be understood that the high level to which the present invention relates is a high voltage as opposed to a low level. For example, the low level can be set to a value ranging from 0 to 0.25V, and the high level can be set to a value ranging from 3.3 to 5V.

According to the above description, the utility model provides a voltage detection circuit just can carry out battery voltage's detection when power module is battery powered, when power module is not battery powered, can not carry out battery voltage's detection. Therefore, the utility model provides a voltage detection circuit compares current real-time detection battery voltage's voltage detection circuit, can reduce voltage detection circuit to the consumption of battery power, has improved the duration of a journey ability of battery.

Fig. 4 is a schematic diagram of another voltage detection circuit provided by the present invention. As shown in fig. 4, further, on the basis of the above embodiment, the voltage detection circuit may further include: and a feedback module.

The input end of the feedback module is connected with the output end of the detection module, and the output end of the feedback module is connected with the first input end of the detection module.

In this embodiment, the voltage at the first input terminal of the detection module can be pulled up by recharging the high level output by the detection module to the first input terminal of the detection module through the feedback module. Thus, when the voltage of the positive electrode of the battery is lower than the second OVP voltage, the voltage of the first input end is lower than the reference voltage. At this time, the detection module may conclude that the voltage of the battery is not over-voltage, thereby outputting a low level. By the method, the situation that the output result of the detection module jumps frequently when the voltage of the anode of the battery fluctuates around the first OVP can be avoided.

That is to say, through the first OVP voltage and the second OVP voltage, a hysteresis voltage for detecting the battery voltage can be formed, the accuracy and the reliability of the voltage detection circuit are ensured, and the anti-interference capability of the voltage detection circuit is enhanced.

The present embodiment does not limit the implementation manner of the feedback module. For example, the feedback module may be any module capable of feeding back the high level output by the detection module to the first input terminal of the detection module. For example, the feedback module may include a diode and a first resistor. The anode of the diode is connected with the output end of the detection module, the cathode of the diode is connected with one end of the first resistor, and the other end of the first resistor is the output end of the feedback module.

When the detection module outputs a high level, the diode is conducted, the output end of the detection module is conducted with the first input end of the detection module, and therefore the high level output by the detection module is subjected to voltage division through the first resistor and then is fed back to the first input end of the detection module. When the detection module outputs a low level, the diode is cut off, and the connection between the output end of the detection module and the first input end of the detection module is disconnected.

Optionally, the diode may also adopt other switches capable of turning on and off according to the magnitude of the voltage, for example, a triode or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and the like, which are not described herein again. The first resistor for dividing the high level output by the detection module may be implemented by a voltage dividing circuit of another form, which is not limited to this.

Fig. 5 is a schematic diagram of another voltage detection circuit provided by the present invention. As shown in fig. 5, further, on the basis of the above embodiment, the voltage detection circuit may further include: and a voltage division module.

The output end of the switch module is connected with the input end of the voltage division module, and the output end of the voltage division module is connected with the first input end of the detection module.

And the detection module is specifically used for detecting whether the voltage of the positive electrode of the battery is greater than or equal to the first overvoltage protection OVP voltage or not according to the reference voltage provided by the voltage providing module and the divided voltage of the positive electrode of the battery. That is, the detection module may determine whether the voltage of the positive electrode of the battery is greater than or equal to the first overvoltage protection OVP voltage by comparing the divided voltage of the positive electrode of the voltage with the reference voltage. When the divided voltage of the voltage anode is smaller than the reference voltage, the voltage of the battery anode is smaller than the first overvoltage protection OVP voltage, and when the divided voltage of the voltage anode is larger than or equal to the reference voltage, the voltage of the battery anode is larger than or equal to the first overvoltage protection OVP voltage.

Through above-mentioned voltage division module, can carry out the partial pressure to the anodal voltage of battery to make detection module can judge whether excessive pressure of battery voltage based on the partial pressure voltage. Because the voltage after voltage division is less than the voltage of the battery anode, a smaller reference signal can be set, and whether the battery is over-voltage or not can be detected. By the mode, the power consumption of the voltage output module when outputting the reference signal can be reduced, and the power consumption of the voltage detection circuit is further reduced.

The voltage dividing module may be any module capable of realizing voltage division, for example, the voltage dividing module may include: a second resistor and a third resistor. One end of the second resistor is an input end of the voltage division module, and the other end of the second resistor is an output end of the voltage division module. The other end of the second resistor is connected with one end of a third resistor, and the other end of the third resistor is grounded.

For another example, the voltage divider module may include: a second resistor, a third resistor, and a fourth resistor. One end of the second resistor is an input end of the voltage division module, and the other end of the second resistor is an output end of the voltage division module. The other end of the second resistor is respectively connected with one end of the third resistor and one end of the fourth resistor, and the other end of the third resistor and the other end of the fourth resistor are grounded.

The size of the second resistor, the size of the third resistor and the size of the fourth resistor can be specifically set according to actual requirements.

The following describes an implementation of each block of the voltage detection circuit according to the present embodiment by way of an example.

Fig. 6 is a schematic diagram of another voltage detection circuit provided by the present invention. As shown in fig. 6, the voltage detection circuit may include: switch module, detection module, partial pressure module, feedback module.

The feedback module includes a diode D303 and a first resistor R315. The anode of the diode D303 is an input end of the feedback module, the cathode of the diode D303 is connected to one end of the first resistor R315, and the other end of the first resistor R315 is an output end of the feedback module.

The voltage division module comprises: a first resistor R316 and a third resistor R319. One end of the first resistor R316 is an input end of the voltage dividing module, and the other end of the first resistor R316 is an output end of the voltage dividing module. The other end of the first resistor R316 is connected to one end of the third resistor R319 and one end of the fourth resistor R320, respectively, and the other end of the third resistor R319 and the other end of the fourth resistor R320 are grounded.

As mentioned above, the on and off of the switch module is controlled by whether the power supply module provides the charging voltage for the battery. Therefore, the switch module according to the present invention may be any switch module that can be turned on or off according to the voltage level, for example.

As one possible implementation, the switch module may include a first switch Q335 and a second switch Q336. A first end of the first switch Q335 is a control end Vo of the switch module, a second end of the first switch Q335 is connected to a first end of the second switch Q336, and a third end of the first switch Q335 is grounded; the second terminal of the second switch Q336 is an input terminal of the switch module, and the third terminal of the second switch Q336 is an output terminal of the switch module.

The first switch Q335 and the second switch Q336 may be any switches that can be turned on and off according to the magnitude of the voltage, such as a Transistor or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).

Taking a triode as an example, when the first switch Q335 is a triode, the first end of the first switch Q335 adopts a base B of the triode, the second end of the first switch Q335 adopts a collector C of the triode, and the third end of the first switch Q335 adopts an emitter E of the triode. When the second switch Q336 is a triode, the first end of the second switch Q336 adopts a base B of the triode, the second end of the second switch Q335 adopts an emitter E of the triode, and the third end of the second switch Q335 adopts a collector C of the triode.

Taking a MOSFET as an example, when the first switch Q335 is a MOSFET, the first terminal of the first switch Q335 is a gate of the MOSFET, the second terminal of the first switch Q335 is a drain of the MOSFET, and the third terminal of the first switch Q335 is a source of the MOSFET. When the second switch Q336 is a MOS transistor, the first terminal of the second switch Q336 uses a gate of a MOSFET, the second terminal of the second switch Q336 uses a source of the MOSFET, and the third terminal of the second switch Q336 uses a drain of the MOSFET.

It is understood that the transistor may be an NPN transistor, for example. In particular, other transistors, such as PNP transistors, may be used. When the PNP triode is used, the connection relationship of the PNP triode in the control circuit can be adjusted according to the working principle of the PNP triode, and the connection relationship is not limited. The MOS transistor may be, for example, an NMOS transistor. In particular, other MOS transistors, such as PMOS transistors, may also be used. When the PMOS transistor is used, the connection relationship of the PMOS transistor in the control circuit can be adjusted according to the operating principle of the PMOS transistor, which is not limited. Fig. 6 is a schematic diagram illustrating the first switch being a PNP transistor and the second switch being an NPN transistor.

In addition, although the first switch Q335 and the second switch Q336 are illustrated as transistors in the above examples and illustrations, it is understood that the first switch Q335 and the second switch Q336 may be different types of switches. For example, the first switch Q335 is a transistor and the second switch Q336 is a MOS transistor, or the first switch Q335 is a MOS transistor and the second switch Q336 is a transistor.

With continued reference to fig. 6, optionally, in some embodiments, the switch module may further include any one of the following resistors: a fifth resistor RB341, a sixth resistor RB385, and a seventh resistor RB 399.

When the fifth resistor RB341 is included, the power supply module may be connected to the first terminal of the first switch Q335 through the fifth resistor RB 341. When the sixth resistor RB385 is included, the second terminal of the first switch Q335 may be connected to the first terminal of the second switch Q336 through the sixth resistor RB 385. When the seventh resistor RB399 is included, the battery anode may be connected to the second terminal of the second switch Q336 through the seventh resistor RB 399.

The fifth resistor RB341, the sixth resistor RB385 and the seventh resistor RB399 are used for limiting current and improving interference resistance, and the stability of the circuit is improved. It should be understood that the resistors of the above examples are not required for the switch module, and may be omitted or replaced by any other devices, circuits, etc. having similar functions.

As mentioned above, the detection module is used for detecting whether the voltage of the positive pole of the battery is greater than or equal to the first overvoltage protection OVP voltage according to the reference voltage provided by the voltage providing module. Therefore, the detection module of the present invention may be any module capable of comparing two voltages.

With continued reference to fig. 6, as one possible implementation, the detection module may include an operational amplifier U301B. The non-inverting input terminal 5 of the operational amplifier U301B is a first input terminal of the detection module, the inverting input terminal of the operational amplifier U301B is a second input terminal of the detection module, and the output terminal 7 of the operational amplifier U301B is an output terminal of the detection module.

Although the above examples and illustrations have described the detection circuit by taking the operational amplifier U301B as an example, the operational amplifier may be any type of operational amplifier, and may be determined according to actual requirements. The detection circuit may be implemented by other circuits capable of comparing two voltages, such as a comparator.

With continued reference to fig. 6, optionally, in some embodiments, the detection module may further include any one of the following devices: an eighth resistor R317, a ninth resistor R318 and a capacitor C305.

When the eighth resistor R317 is included, the positive electrode of the battery can be connected to the non-inverting input terminal 5 of the operational amplifier U301B through the first resistor R316 and the eighth resistor R317. When the ninth resistor R318 and the capacitor C305 are included, the voltage providing module may be connected to the inverting input terminal 6 of the operational amplifier U301B through the ninth resistor R318 and the capacitor C305, wherein the other end of the capacitor C305 is connected to ground. It should be understood that one of the ninth resistor R318 and the capacitor C305 may be provided to achieve the corresponding function.

The eighth resistor R317, the ninth resistor R318 and the capacitor C305 are used for limiting current and improving interference resistance, so that the stability of the circuit is improved. It should be understood that the resistors of the above examples are not required for the switch module, and may be omitted or replaced by any other devices, circuits, etc. having similar functions.

The operation principle of the voltage detection circuit shown in fig. 6 is described below by taking the voltage detection circuit as an example:

when the power supply module charges the battery, the voltage of the control end Vo of the switch module is set high. Accordingly, the BE pin of the first switch Q335 is set high and the first switch Q335 is turned on. The B-pole of the second switch Q336 is pulled low by the conduction of the first switch Q335, so that the second switch Q336 is turned on. The voltage of the battery positive electrode BT + flows into the first resistor R316 of the voltage dividing module through the turned-on second switch Q336, so that the voltage of the battery positive electrode BT + is subjected to resistance voltage division by the first resistor R316, the third resistor R319 and the fourth resistor R320 of the voltage dividing module, and then is input to the non-inverting input terminal 5 of the operational amplifier U301B.

Taking the reference voltage provided by the voltage providing module (not shown in fig. 6) as 2.5V-REF, after the divided voltage of the positive electrode BT + is inputted to the non-inverting input terminal 5 of the operational amplifier U301B, the operational amplifier U301B may determine whether the divided voltage of the positive electrode BT + is greater than or equal to 2.5V-REF.

When the voltage of the battery positive electrode BT + has not reached the first OVP voltage, the voltage input at the non-inverting input terminal 5 of the operational amplifier U301B is lower than 2.5V-REF, indicating that the battery has not been over-pressurized (i.e., the battery has not been fully charged), and at this time, the output terminal 7 of the operational amplifier U301B outputs a low level. Assume that the low level is 0V, i.e., the voltage at BT-OVP is equal to 0.

When the voltage of the positive electrode BT + of the battery is greater than or equal to the first OVP voltage, the voltage input at the non-inverting input terminal 5 of the operational amplifier U301B is greater than or equal to the 2.5V-REF voltage, indicating that the battery is over-voltage (i.e., the battery is fully charged). At this time, the output terminal 7 of the operational amplifier U301B outputs a high level. I.e. the voltage at BT-OVP is high.

When the BT-OVP is set high, the diode D303 is turned on, and the non-inverting input terminal 5 of the operational amplifier U301B is sunk to flow high from the BT-OVP, so that the voltage input at the non-inverting input terminal 5 is pulled high. Thus, when the voltage at the positive terminal of the battery is less than the second OVP voltage, the voltage at the non-inverting input 5 of the operational amplifier U301B will be less than 2.5V-REF. At this time, the operational amplifier U301B concludes that the voltage of the battery is not over-voltage, thereby outputting a low level. In this way, frequent jumps in the output result of the operational amplifier U301B due to fluctuations in the voltage of the battery anode near the first OVP can be avoided.

The utility model provides a voltage detection circuit has following advantage:

1. the voltage detection circuit detects the battery voltage when the power supply module supplies power to the battery, and does not detect the battery voltage when the power supply module does not supply power to the battery. Therefore, the utility model provides a voltage detection circuit compares current real-time detection battery voltage's voltage detection circuit, can reduce voltage detection circuit to the consumption of battery power, has improved the duration of a journey ability of battery.

2. Through setting up first OVP voltage and second OVP voltage, can form the hysteresis voltage of battery voltage detection, guarantee voltage detection circuit's accuracy, reliability, strengthened voltage detection circuit's interference killing feature.

3. The voltage detection circuit is composed of analog circuits, and is simple in structure, low in cost and high in maintainability.

The utility model also provides an electronic equipment, this electronic equipment can include the battery, for battery powered's power module to and, the voltage detection circuit that any preceding embodiment provided for detect the voltage of battery when the battery charges. The implementation principle and technical effect of the voltage detection circuit may refer to the description of the foregoing embodiments, which are not repeated herein.

In this embodiment, the electronic device may determine whether the voltage of the battery is over-voltage by detecting the level of the output of the module in the voltage detection circuit. For example, if the level output by the detection module is a low level, it indicates that the voltage of the battery is not over-voltage, i.e. the battery is not in an over-charged state, at this time, the electronic device can operate normally without any processing.

If the level output by the detection module is a high level, the voltage overvoltage of the battery is indicated, that is, the battery is in an overcharged state, and at this time, the electronic device can perform overvoltage protection on the battery.

For example, the electronic device may disconnect a charging path for charging the battery; or, if the electronic device is provided with an indicator light with a fully charged battery, the electronic device can control the indicator light to be on constantly; or, if the electronic device is provided with a display screen, the electronic device may display, for example, a prompt message that the battery is fully charged through the display screen; alternatively, the electronic device may issue an alarm prompt tone or the like that the charging is full.

By the above mode, the battery can be charged and protected, meanwhile, the consumption of the battery power due to the charging protection can be reduced, and the cruising ability of the battery is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A voltage detection circuit, comprising: the device comprises a switch module, a detection module and a voltage supply module; wherein the content of the first and second substances,

the control end of the switch module is connected with the power supply module, the input end of the switch module is connected with the anode of the battery, the output end of the switch module is connected with the first input end of the detection module, and the second input end of the detection module is connected with the voltage supply module;

the detection module is used for detecting whether the voltage of the battery anode is greater than or equal to a first overvoltage protection voltage or not according to the reference voltage provided by the voltage providing module.

2. The circuit of claim 1, wherein the voltage detection circuit further comprises: a feedback module; the input end of the feedback module is connected with the output end of the detection module, and the output end of the feedback module is connected with the first input end of the detection module;

the feedback module is used for recharging a high level output by the detection module when the voltage of the battery anode is greater than or equal to the first overvoltage protection voltage to a first input end of the detection module;

the detection module is further configured to output a low level when the voltage of the battery anode is smaller than a second overvoltage protection voltage, where the second overvoltage protection voltage is smaller than the first overvoltage protection voltage.

3. The circuit of claim 2, wherein the feedback module comprises: a diode and a first resistor;

4. The circuit of claim 2, wherein the voltage detection circuit further comprises: a voltage division module; the output end of the switch module is connected with the input end of the voltage division module, and the output end of the voltage division module is connected with the first input end of the detection module;

the voltage division module is used for dividing the voltage of the battery anode;

the detection module is specifically configured to detect whether the voltage of the battery positive electrode is greater than or equal to the first overvoltage protection voltage according to the reference voltage provided by the voltage providing module and the divided voltage of the battery positive electrode.

5. The circuit of claim 4, wherein the voltage divider module comprises: a second resistor, a third resistor and a fourth resistor;

one end of the second resistor is an input end of the voltage division module, and the other end of the second resistor is an output end of the voltage division module;

6. The circuit according to any of claims 1-5, wherein the switch module comprises: a first switch and a second switch;

the first end of the first switch is a control end of the switch module, the second end of the first switch is connected with the first end of the second switch, and the third end of the first switch is grounded;

7. The circuit of claim 6, wherein the first switch is a triode;

the first end of the first switch adopts a base electrode of a triode, the second end of the first switch adopts a collector electrode of the triode, and the third end of the first switch adopts an emitting electrode of the triode.

8. The circuit of claim 6, wherein the second switch is a triode;

the first end of the second switch adopts a base electrode of a triode, the second end of the first switch adopts an emitting electrode of the triode, and the third end of the first switch adopts a collector electrode of the triode.

9. The circuit of any of claims 1-5, wherein the detection module comprises: an operational amplifier;

the non-inverting input end of the operational amplifier is the first input end of the detection module, the inverting input end of the operational amplifier is the second input end of the detection module, and the output end of the operational amplifier is the output end of the detection module.

10. An electronic device, characterized in that the electronic device comprises a battery, a power supply module for supplying power to the battery and a voltage detection circuit according to any of claims 1-9.