CN212258489U - Battery charge-discharge circuit and cooking machine - Google Patents

Abstract

The application provides a battery charge-discharge circuit and cooking machine. The battery charging and discharging circuit comprises a battery, a charging circuit, a discharging circuit and a thermosensitive switch, wherein the battery is connected with the load and used for supplying power to the load; the charging circuit is connected with the charging power supply and the battery and used for receiving the electric energy output by the charging power supply and providing the electric energy for the battery; the discharge line is connected with the battery and the load and used for supplying the electric energy of the battery to the load; the thermosensitive switch is connected in series with at least one of the charging line and the discharging line, and is switched off when the ambient temperature of the thermosensitive switch is lower than or equal to the switching-off threshold of the thermosensitive switch, and is switched on when the ambient temperature is higher than the switching-off threshold. The food processor comprises a load and a battery charging and discharging circuit. The battery charge-discharge circuit can protect the food processer when the food processer works in a low-temperature environment.

Description

Battery charge-discharge circuit and cooking machine

Technical Field

The application relates to the field of household appliances, in particular to a battery charging and discharging circuit and a food processor.

Background

When making cold drinks (for example, making ice cream through an ice cream accompanying cup) by some food processors, food materials are usually put into the food processors, then the food processors are put into a refrigerator, and when the temperature of the food materials in the food processors reaches the cold drink making requirement, the food materials are stirred by a stirring knife assembly of a battery-driven food processor arranged in the food processors to make cold drinks. These food processors are usually operated in a low temperature environment, so that the battery in the food processor may need to be charged and discharged in a low temperature environment. When the ambient temperature is lower than a certain temperature, the battery may not be charged and discharged normally, which may affect the capacity, service life, etc. of the battery, and even cause damage to the battery and the food processor.

SUMMERY OF THE UTILITY MODEL

The application provides a modified battery charge-discharge circuit and cooking machine can protect cooking machine and its battery under low temperature environment.

The application provides a battery charge and discharge circuit includes:

a battery connected to the load for supplying power to the load;

the charging circuit is connected with a charging power supply and the battery, and is used for receiving the electric energy output by the charging power supply and providing the electric energy for the battery;

a discharge line connected between the battery and the load for supplying the electric energy of the battery to the load;

and the thermosensitive switch is connected in series with at least one of the charging line and the discharging line, and is used for disconnecting the line when the ambient temperature of the thermosensitive switch is lower than or equal to the disconnection threshold of the thermosensitive switch and conducting when the ambient temperature is higher than the disconnection threshold.

Further, the thermal switch comprises an NTC thermal switch, and/or the load comprises a motor. In some embodiments, the NTC thermal switch is easy to obtain, small in size, and low in price, so that the circuit size can be effectively reduced, and the circuit cost can be reduced.

Furthermore, the battery charging and discharging circuit comprises a charging circuit, and the charging circuit is connected between the charging power supply and the battery through the charging circuit and is used for charging the battery;

the thermal switch comprises a first thermal switch; the first thermal switch is connected to the charging circuit, and the charging circuit is powered off when the ambient temperature is lower than an off threshold of the first thermal switch. In some embodiments, the first thermal switch powers off the charging circuit to stop charging the battery, which can effectively prevent the battery from being damaged due to charging the battery at a low temperature.

Furthermore, the charging circuit comprises a voltage transformation circuit, and the voltage transformation circuit is connected to the charging power supply through the charging circuit and is used for transforming the voltage output by the charging power supply;

the first thermosensitive switch is connected between the charging power supply and the voltage transformation circuit. In some embodiments, the first thermal switch disconnects the transformer circuit from the charging power source at low temperature, so that the transformer circuit is powered off and power is saved.

Further, the charging circuit comprises an input detection circuit, and the input detection circuit is connected between the charging power supply and the voltage transformation circuit through the charging circuit and is used for detecting an output electric signal of the charging power supply;

the first thermosensitive switch is connected between the input detection circuit and the charging power supply. In some embodiments, the first thermal switch disconnects the input detection circuit from the charging power source at low temperatures, powering down the input detection circuit, and saving power.

Furthermore, the battery charging and discharging circuit comprises a filter circuit, and the filter circuit is connected between the charging power supply and the input detection circuit through the charging circuit;

the first thermosensitive switch is connected between the filter circuit and the input detection circuit; or

The first thermosensitive switch is connected between the charging power supply and the filter circuit. In some embodiments, the first thermal switch is connected between the filter circuit and the input detection circuit to prevent interference of the unfiltered electrical signal with the first thermal switch. In some embodiments, the first thermal switch is connected between the charging power supply and the filter circuit, and when the first thermal switch is turned off, the filter circuit is also powered off at the same time, so that the filter circuit is prevented from continuing to operate after the charging of the battery is stopped, and the electric energy is prevented from being wasted.

Furthermore, the thermal switch comprises a second thermal switch, the battery charging and discharging circuit comprises a driving circuit, and the driving circuit is connected between the battery and the load through the discharging circuit and is used for driving the load to work;

the second thermosensitive switch is connected between the driving circuit and the battery; or

The second thermosensitive switch is connected between the driving circuit and the load; or

The second thermal switch is connected between the load and the battery. In some embodiments, the second thermal switch is turned off to stop the driving of the load by the driving circuit, so that the battery discharge is stopped at a low temperature, and the battery and the food processor are effectively prevented from being damaged by the battery discharge at the low temperature.

Further, the turn-off threshold of the thermal switch is less than or equal to 0 ℃ and greater than or equal to minus 5 ℃. In some embodiments, the disconnection threshold of the thermal switch is less than or equal to 0 ℃ to ensure the cooking function of the cooking machine, and the disconnection threshold of the thermal switch is greater than or equal to minus 5 ℃ to reduce the risk that the battery is damaged due to abnormal charging and/or discharging in a low-temperature environment.

The application provides a cooking machine includes:

a load; and

any of the battery charging and discharging circuits described above.

Further, the cooking machine comprises an ice cream cooking machine.

The battery charge and discharge circuit in some embodiments of this application, charging source and battery are connected to the charging line, discharging line connects battery and load, the temperature sensing switch is established ties in charging line and/or discharging line, can be so that when ambient temperature is less than temperature sensing switch's disconnection threshold, disconnection charging line and/or discharging line through temperature sensing switch's disconnection, so that the battery stops to charge and/or discharge, reduce because of the unable normal charge and/or discharge of battery under low temperature environment and lead to battery capacity reduction, the life-span shortens, even the impaired risk of battery and cooking machine, so protection battery and cooking machine.

Drawings

Fig. 1 is a schematic view of a food processor according to an embodiment of the present application;

FIG. 2 is a block circuit diagram of a battery charging and discharging circuit according to an embodiment of the present application;

fig. 3 is a circuit diagram of the battery charge and discharge circuit in fig. 2.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" means at least two. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Fig. 1 is a schematic diagram of a food processor 200 according to an embodiment of the present application. The food processor 200 includes a main body 201 and a cup assembly 202. The cup assembly 202 may be assembled to the host 201. The host 201 includes a load 23 and a battery 22. The load 23 may include power elements such as motors, heating assemblies, display devices, and the like. The cup assembly 202 may be used to house food materials, including a blending blade assembly 203. The blender knife assembly 203 may be connected to a load 23. In this embodiment, the load 23 is a motor, and the electric energy provided by the battery 22 can drive the load 23 to rotate, so as to drive the stirring blade assembly 203 to rotate, thereby stirring the food material in the cup assembly 202. The food processor 200 can be used to make a cold drink. In this embodiment, the processor 200 is used for making ice cream, including an ice cream processor, such as an ice cream traveling cup. Some food processors 200 for making cold drinks need to work in a low-temperature environment, and in the related art, the battery 22 may not be charged and discharged normally when the ambient temperature is lower than a certain temperature, thereby causing the problem that the food processor 200 is damaged. For example, when the battery 22 cannot be normally charged in a low-temperature environment, the positive electrode and the negative electrode of the battery 22 may be short-circuited, which may cause damage to the battery 22, burnout of the food processor 200, and potential safety hazard to a user; for another example, the discharge of the battery 22 in a low temperature environment may cause a capacity decay, affect the service life of the battery 22, and may not be normally discharged to supply enough electric energy to drive the load 23, so that the load 23 may not be normally started, thereby possibly causing a problem in that the load 23 is damaged.

Fig. 2 is a circuit block diagram of a battery charging and discharging circuit 100 according to an embodiment of the present disclosure. The food processor 200 in fig. 1 includes a battery charging and discharging circuit 100.

Referring to fig. 2, the battery charging and discharging circuit 100 includes a battery 22, a charging line 17, a discharging line 18, and a thermal switch 12. The charging line 17 is connected to the charging power supply 21 and the battery 22, and is used for receiving the electric energy output by the charging power supply 21 and supplying the electric energy to the battery 22. The discharge line 18 connects the battery 22 and the load 23 for supplying the power of the battery 22 to the load 23.

In some embodiments, battery 22 comprises a lithium battery. Battery 22 may comprise a single battery, such as a lithium battery that provides 3.7 volts; it may also include a battery pack comprising a plurality of cells, for example, a battery pack comprising N cells of 3.7 v lithium cells connected in series to provide 3.7 x N v. In this embodiment, the battery 22 is a battery pack formed by two 3.7 v lithium batteries connected in series and capable of providing 7.4 v.

In some embodiments, the charging power source 21 and the battery 22 may be connected via a USB (Universal Serial Bus) interface, such as a USB Type-C interface or a Micro USB interface. The USB interface can output a stable dc weak current (e.g., +5 v dc weak current) to charge the battery 22, so as to prevent the battery 22 from being damaged due to an excessively high or unstable charging voltage. In other embodiments, the charging power source 21 and the battery 22 may be connected through other types of interfaces.

In the present embodiment, the charging power supply 21 includes an ac power supply (e.g., commercial power). The ac power output from the charging power supply 21 can be converted into a dc weak power through an adapter (not shown), and then the battery 22 is charged through the USB interface. In other embodiments, the charging power supply 21 comprises a dc power supply.

The thermal switch 12 is connected in series with at least one of the charging line 17 and the discharging line 18, and is turned off when the ambient temperature of the thermal switch 12 is lower than or equal to the turn-off threshold of the thermal switch 12, and is turned on when the ambient temperature is higher than the turn-off threshold. The off threshold of the thermal switch 12 may be lower than the ambient temperature required by the processor 200 to make a cold drink and higher than or equal to the minimum ambient temperature required by the battery 22 to maintain normal charging and/or discharging functions. Thus, on the premise of ensuring that the food processor 200 can normally complete the preparation of the cold drink, if the ambient temperature of the food processor 200 is lower than the temperature required by the battery 22 to maintain the normal charging and/or discharging function, the line where the thermal switch 12 is located is disconnected, so that the problem that the food processor 200 is damaged due to the fact that the battery 22 cannot be normally charged and/or discharged in a low-temperature environment can be avoided. For example, the ambient temperature required by the food processor 200 to complete the preparation of a cold drink is-1 degree celsius, the battery 22 cannot maintain the normal charging and/or discharging function when the ambient temperature is lower than-10 degrees celsius, and the turn-off threshold of the thermal switch 12 may be set to be less than-1 degree celsius, greater than or equal to-10 degrees celsius, such as-5 degrees celsius. In some embodiments, the turn-off threshold of the thermal switch 12 is less than or equal to 0 degrees celsius and greater than or equal to minus 5 degrees celsius. Thus, on the premise of ensuring the cold drink making function of the food processor 200, the battery 22 can be prevented from being incapable of being normally charged and/or discharged in a low-temperature environment, and damage to the food processor 200 can be prevented.

In some embodiments, the thermal switch 12 comprises an NTC thermal switch. The NTC thermal switch is easy to obtain, small in size and low in price, and can effectively reduce the circuit size and the circuit cost.

In the present embodiment, the thermal switch 12 includes a first thermal switch 121 and a second thermal switch 122. The first thermal switch 121 is connected in series to the charging line 17, and is used for controlling the charging of the battery 22 according to the ambient temperature; the second thermal switch 122 is connected in series with the discharge line 18 for controlling the discharge of the battery 22 according to the ambient temperature. In this way, the food processor 200 can be protected even when the battery 22 cannot be normally charged and/or discharged due to low temperature, and the circuit safety is high.

In some embodiments, the opening thresholds of the first and second thermal switches 121 and 122 may not be the same. In this way, when the lowest temperature at which the battery 22 maintains the normal charging function is different from the lowest temperature at which the battery 22 maintains the normal discharging function, the charging and discharging function of the battery 22 can be turned off at different environmental temperatures, and the effective operating state of the battery 22 can be ensured to the maximum extent. For example, when the lowest temperature of the battery 22 for maintaining the normal charging function is higher than the lowest temperature of the battery 22 for maintaining the normal discharging function, the turn-off threshold of the first thermal switch 121 may be greater than the turn-off threshold of the second thermal switch 122, so that when the charging function of the battery 22 is turned off while the first thermal switch 121 is turned off, the second thermal switch 122 may still be in the connected state, and the battery 22 may still be discharged to drive the load 23 to operate.

In other embodiments, the turn-off thresholds of the first and second thermal switches 121 and 122 may be the same. For example, the turn-off thresholds of the first and second thermo- switches 121 and 122 may be set such that the first and second thermo- switches 121 and 122 are turned off if the ambient temperature is lower than or equal to any one of the temperatures based on the lowest temperature at which the battery 22 maintains the normal charging function and the lowest temperature at which the battery 22 maintains the normal discharging function. In this way, the charge and discharge functions of the battery 22 are turned off at the same time, and the circuit safety is high.

In other embodiments, the thermal switch 12 can be connected in series only to the charging line 17 or the discharging line 18, and the food processor 200 can be protected by controlling the charging or discharging of the battery 22 according to the ambient temperature.

The battery charging and discharging circuit 100 in some embodiments of the present application controls the on and off of the charging line 17 and/or the discharging line 18 by the thermal switch 12 according to the ambient temperature, and can disconnect the charging line 17 and/or the discharging line when the ambient temperature is lower than or equal to the temperature at which the battery 22 is normally charged and/or discharged, thereby avoiding the problem that the food processor 200 is damaged or the problem of the potential safety hazard during the use of the food processor 200 by the user, which is caused by the abnormal charging and discharging of the battery 22 in the low-temperature environment. When the ambient temperature is higher than the normal charging and/or discharging temperature of the battery 22, the thermal switch 12 can turn on the charging line 17 and/or the discharging line 18, so as to ensure the normal operation of the food processor 200. Therefore, the battery charge-discharge circuit 100 of this application works in low temperature environment at cooking machine 200, under the normal work prerequisite of guaranteeing cooking machine 200, can effectively protect cooking machine 200, greatly reduced cooking machine 200's impaired risk.

In this embodiment, the battery charging/discharging circuit 100 includes a charging circuit 11, and the charging circuit 11 is connected between the charging power supply 21 and the battery 22 through a charging line 17, and is used for charging the battery 22. The first thermal switch 121 is connected to the charging circuit 17, and the charging circuit 17 is deenergized when the ambient temperature is lower than or equal to the off threshold of the first thermal switch 121. Thus, the first thermal switch 121 disconnects the charging circuit 17 to stop charging the battery 22, so as to effectively prevent the battery 22 from being damaged by charging the battery 22 at a low temperature, and prevent the charging power supply 21 and the charging circuit 17 from forming a current path to cause electric energy waste. Specifically, the first thermal switch 121 may be connected in series in the charging line 17 between the charging power source 21 and the charging circuit 11, and when the ambient temperature is lower than or equal to the turn-off threshold of the first thermal switch 121, the first thermal switch 121 is turned off, so that the charging line 17 between the charging power source 21 and the charging circuit 11 is turned off to power off the charging circuit 17.

In this embodiment, the battery charging/discharging circuit 100 includes a control circuit 15, and the control circuit 15 is connected to the charging circuit 17. When the first thermal switch 121 is turned on and the charging power source 21 charges the battery 22 through the charging circuit 11, the control circuit 15 may control the charging circuit 11 to perform charging control on the battery 22.

In this embodiment, the battery charging and discharging circuit 100 includes a driving circuit 14, and the driving circuit 14 is connected between the battery 22 and the load 23 through a discharging line 18, and is used for driving the load 23 to operate. The drive circuit 14 may be connected to the control circuit 15, and the control circuit 15 controls the drive circuit 14 to control the connection and disconnection of the battery 22 and the load 23, thereby controlling the driving of the load 23. The second thermal switch 122 is connected between the drive circuit 14 and the load 23. In this way, the second thermal switch 122 is turned off to stop the driving of the load 23 by the driving circuit 14, so that the safety of the food processor 200 can be preferentially ensured during the operation of the food processor 200, and the risk of damage to the food processor 200 is reduced. In other embodiments, the second thermal switch 122 is connected between the driving circuit 14 and the battery 22. In other embodiments, the second thermal switch 122 is connected between the load 23 and the battery 22. The circuit connection mode can be flexibly selected according to actual conditions.

Fig. 3 is a circuit diagram of the battery charging and discharging circuit 100 in fig. 2. Referring to fig. 2 and 3, the charging circuit 11 includes a transforming circuit 116, and the transforming circuit 116 is connected to the charging power source 21 through the charging line 17 for transforming the voltage output by the charging power source 21. The voltage transformation circuit 116 can boost or reduce the voltage output by the charging power supply 21, thereby preventing the charging voltage of the battery 22 from being too high or too low and causing damage to the battery 22. In this embodiment, the transformer circuit 116 includes a boost circuit. In this embodiment, the battery 22 is a battery pack composed of two 3.7 v lithium batteries and capable of providing 7.4 v, and the battery 22 is connected to the charging power supply 21 through a USB interface that outputs only 5 v, so that the voltage output by the USB interface needs to be boosted by the transforming circuit 116, and the boosted voltage output by the transforming circuit 116 is output to the battery 22 for charging. In some embodiments, the first thermal switch 121 is connected between the charging power source 21 and the transforming circuit 116. In this way, the first thermal switch 121 disconnects the transformer circuit 116 from the charging power source 21 at a low temperature, and the transformer circuit 116 is powered off, thereby saving electric power.

In some embodiments, the transforming circuit 116 includes an inductor L1, one end of the inductor L1 is connected to the battery 22, and the other end of the inductor L1 is connected to the charging source 21 through the first thermal switch 121. By selecting an appropriate inductance L1 based on the operating characteristics of the inductance L1, the voltage output from the charging power supply 21 can be boosted to an appropriate voltage, and the battery 22 can be charged.

In some embodiments, the charging circuit 11 includes an input detection circuit 112, and the input detection circuit 112 is connected between the charging power source 21 and the transforming circuit 116 through the charging line 17 for detecting the output electrical signal of the charging power source 21. The input detection circuit 112 may output a first detection signal when detecting the output electric signal of the charging power supply 21; when the output electric signal of the charging power supply 21 is not detected, the second detection signal may be output. The input detection circuit 112 may be connected to the control circuit 15, so that the control circuit 15 determines that the charging circuit 11 is powered on based on the first detection signal, and determines that the charging circuit 11 is powered off based on the second detection signal, and thus, the charging control of the battery 22 is possible. Specifically, when the voltage on the input detection circuit 112 is the first voltage, the input detection circuit 112 outputs the first detection signal; when the voltage across the input detection circuit 112 is the second voltage, the input detection circuit 112 outputs the second detection signal. The first voltage may be a voltage input to the detection circuit 112 when the charging power supply 21 is turned on; the second voltage may be a voltage across the input detection circuit 112 when the charging power supply 21 is turned off.

In some embodiments, the first thermal switch 121 is connected between the input detection circuit 112 and the charging power source 21. When the first thermal switch 121 is turned on, the charging power supply 21 is connected to the input detection circuit 112, so that the voltage on the input detection circuit 112 is a first voltage, and a first detection signal is output; when the second thermal switch 121 is turned off at a low temperature, the connection between the charging power supply 21 and the input detection circuit 112 is disconnected, so that the voltage across the input detection circuit 112 becomes a second voltage, and a second detection signal is output. When the first thermal switch 121 is turned off at a low temperature, the connection between the input detection circuit and the charging power supply is disconnected, so that the input detection circuit is powered off, and electric energy is saved.

In some embodiments, the input detection circuit 113 includes a first resistor R1, a second resistor R2, and an input detection terminal CHG _ SIG, the first resistor R1 and the second resistor R2 are connected in series, the first resistor R1 is connected to one end of the charging power source 21, the second resistor R2 is connected to the other end of the charging power source 21 through the first thermal switch 121, and the input detection terminal CHG _ SIG is connected to the control circuit 15 and connected between the first resistor R1 and the second resistor R2. When the first thermal switch 121 is turned on, the first resistor R1 and the second resistor R2 may be used to divide the voltage output by the charging power supply 21. The first detection signal output by the input detection circuit 113 may include a first voltage signal on the first resistor R1 collected by the input detection terminal CHG _ SIG after the first resistor R1 divides the voltage output by the charging power supply 21. The voltage across the first resistor R1 and the second resistor R2 changes after the first thermal switch 121 is turned off, and the second detection signal output by the input detection circuit 113 may include the second voltage signal across the first resistor R1 collected by the input detection terminal CHG _ SIG after the first thermal switch 121 is turned off. The control circuit 15 may determine whether the charging circuit 11 is powered on according to the first voltage signal or the second voltage signal collected by the input detection terminal CHG _ SIG.

In some embodiments, the battery charging and discharging circuit 100 includes a filter circuit 111, and the filter circuit 111 is connected between the charging power source 21 and the input detection circuit 112 through the charging line 17. The filter circuit 111 may filter the electric signal output by the charging power supply 21 to stabilize the electric signal received by the charging circuit 11 and the battery 22.

In some embodiments, the first thermal switch 121 is connected between the filter circuit 111 and the input detection circuit 121, so that the first thermal switch 121 can be prevented from being interfered by an unfiltered electrical signal. In other embodiments, the first thermal switch 121 is connected between the charging power source 21 and the filter circuit 111, so that the filter circuit 111 is powered off when the first thermal switch 121 is turned off, and the filter circuit 111 is prevented from continuing to operate after the charging of the battery 22 is stopped, which results in waste of electric energy.

In some embodiments, the filter circuit 111 includes a filter capacitor EC1, and the filter capacitor EC1 is connected to the charging power supply 21 for filtering the voltage output by the charging power supply 21. In other embodiments, the filter capacitor EC1 is connected to the charging power source 21 through the first thermal switch 121.

In some embodiments, the charging circuit 11 includes a first switch circuit 114, the first switch circuit 114 is connected to the control circuit 15, and the control circuit 15 controls the charging of the battery 22 by controlling the on/off of the first switch circuit 114. Specifically, the first switch circuit 114 may be connected between the positive electrode of the battery 22 and the negative electrode of the battery 22, and when the first thermal switch 121 is turned on, the first switch circuit 114 and the battery 22 are connected in parallel to the charging power source 21. When the first switch circuit 114 is turned on, the parallel branch where the first switch circuit 114 is located forms a short circuit, and the charging power supply 21 does not charge the battery 22; when the first switch circuit 114 is turned off, the parallel branch in which the first switch circuit 114 is located is disconnected, and the charging power supply 21 charges the battery 22.

In some embodiments, the first switch circuit 114 includes a first transistor Q1 and a charge control terminal PWM, the drain of the first transistor Q1 is connected to the terminal of the inductor L1 connected to the positive terminal of the battery 22, the source of the first transistor Q1 is connected to the negative terminal of the battery 22, and the gate of the first transistor Q1 is connected to the control circuit 15 through the charge control terminal PWM. The control circuit 15 controls the gate of the first transistor Q1 to turn on and off the first transistor Q1. When the first transistor Q1 is turned on, one end of the inductor L1 is grounded through the first transistor Q1, and the battery 22 is in an uncharged state; when the first transistor Q1 is turned off, the charging power supply 21 supplies a charging voltage to the battery 22. The control circuit 15 may control the on-period and the off-period of the first transistor Q1 by adjusting the duty ratio of the control signal to control the charging of the battery 22.

In some embodiments, the charging circuit 11 includes an output detection circuit 115, and the output detection circuit 115 is connected between the transformer circuit 116 and the battery 22 and is connected with the control circuit 15. The output detection circuit 115 may be configured to detect a charging voltage output by the charging circuit 11 to the battery 22 and output a corresponding voltage detection signal to the control circuit 15, and the control circuit 15 may control the charging voltage of the battery 22 by controlling the on-time or the off-time of the first switch circuit 114 according to the voltage detection signal.

In some embodiments, the output detection circuit 115 includes a third resistor R6, a fourth resistor R7, and an output detection terminal FB, the third resistor R6 is connected in series with the fourth resistor R7, the third resistor R6 is connected between the transformation circuit 116 and the positive pole of the battery 22, the fourth resistor is connected with the negative pole of the battery 22, and the output detection terminal FB is connected between the third resistor R6 and the fourth resistor R7 and is connected with the control circuit 15. When the battery 22 is in the charging state, the third resistor R6 and the fourth resistor R7 may divide the voltage provided by the transformer circuit 116 to the battery 22, and output the voltage signal at the fourth resistor R7 through the output detection terminal FB as the feedback voltage signal. The control circuit 15 can control the charging of the battery 22 according to the voltage signal.

In some embodiments, the charging circuit 11 includes a voltage output circuit 113 and the battery charging and discharging circuit 100 includes a voltage conversion circuit 16. The voltage conversion circuit 16 is connected to the voltage output circuit 113 and the battery 22, respectively, and is connected to the control circuit 15. The voltage output circuit 113 is connected to the charging power source 21 via the first thermal switch 121, and the voltage output circuit 113 receives the voltage output by the charging power source 21 and outputs a corresponding supply voltage to the voltage conversion circuit 16. The voltage conversion circuit 16 converts the power supply voltage output from the voltage output circuit 113 or the voltage output from the battery 22 into an operating voltage of the control circuit 15 to supply power to the control circuit 15.

In some embodiments, the voltage output circuit 113 includes a voltage output terminal SVIN and a fifth resistor R15, wherein one end of the fifth resistor R15 is connected to the voltage output terminal SVIN. The other end of the fifth resistor R15 is connected to the charging power supply 21 through the first thermal switch 121. When the first thermal switch 121 is turned on, the voltage output by the charging power supply 21 is divided by the fifth resistor R15, and then the corresponding supply voltage is output to the voltage converting circuit 16 through the voltage output terminal SVIN.

In some embodiments, the voltage conversion circuit 16 includes a first diode D2, a second diode D3, a voltage converter U1, and a voltage output terminal VDD. The cathode of the first diode D2 and the cathode of the second diode D3 are connected, the anode of the first diode D2 is connected to the anode of the battery 22, and the anode of the second diode D3 is connected to the voltage output terminal SVIN of the voltage output circuit 113. The voltage output terminal VDD is connected to the control circuit 15. The voltage converter U1 includes an input terminal VIN connected to the cathode of the first diode D2 and the cathode of the second diode D3, and an output terminal VOUT connected to the voltage output terminal VDD. When the first thermal switch 121 is turned off or the charging power supply 21 is not connected to the food processor, the second diode D3 is turned off, the first diode D2 is turned on, and the voltage of the battery 22 is output to the voltage converter U1, so that the voltage converter U1 converts the voltage output by the battery 22 into the driving voltage of the control circuit 15, and then outputs the driving voltage to the control circuit 15 through the voltage output terminal VDD.

When the battery 22 cannot be discharged, if the charging power supply 21 is connected to the food processor and the first thermal switch 121 is turned on, the second diode D3 is turned on, the first diode D2 is turned off, and the voltage converter U1 converts the voltage output by the voltage output circuit 113 into the operating voltage of the control circuit 15 and outputs the operating voltage to the control circuit 15.

When the voltage output circuit 113 and the battery 22 can both output voltage to the voltage conversion circuit 16, if the voltage output by the voltage output circuit 113 is greater than the voltage output by the battery 22, the second diode D3 is turned on, the first diode D2 is turned off, and the voltage converter U1 converts the voltage output by the voltage output circuit 113 into the operating voltage of the control circuit 15 and outputs the operating voltage to the control circuit 15; conversely, the voltage converter U1 converts the voltage output from the battery 22 into an operating voltage for the control circuit 15, and outputs the operating voltage to the control circuit 15.

In some embodiments, the driving circuit 14 includes a second transistor Q2 and a load driving end Moto, the gate of the second transistor Q2 is connected to the control circuit 15 through the load driving end Moto, the drain of the second transistor Q2 is connected to the load 23 through the second thermal switch 122, and the source of the second transistor Q2 is connected to the battery 22. The load driving end Moto may receive a first driving signal or a second driving signal output by the control circuit 15, where the first driving signal may be used to control the second transistor Q2 to be turned on, so that the battery 22 is communicated with the load 23 when the second thermal switch 122 is turned on; the second drive signal may be used to control the second transistor Q2 to turn off to disconnect the battery 22 from the load 23.

The battery charging and discharging circuit 100 of this application can effectively protect cooking machine 200 when cooking machine 200 works in low temperature environment, reduces the impaired risk of cooking machine 200.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (10)

1. The utility model provides a battery charge-discharge circuit, its characterized in that is applied to the cooking machine, the cooking machine includes load (23), battery charge-discharge circuit includes:

a battery (22) connected to the load (23) for supplying power to the load (23);

the charging circuit (17) is connected with a charging power supply (21) and the battery (22), and is used for receiving the electric energy output by the charging power supply (21) and supplying the electric energy to the battery (22);

a discharge line (18) connecting the battery (22) and the load (23) for supplying the load (23) with electric energy from the battery (22);

and the thermosensitive switch (12) is connected in series with at least one of the charging line (17) and the discharging line (18), and is used for disconnecting the line when the environmental temperature of the thermosensitive switch (12) is lower than or equal to the disconnection threshold of the thermosensitive switch (12) and conducting when the environmental temperature is higher than the disconnection threshold.

2. The battery charging and discharging circuit according to claim 1, wherein said thermal switch (12) comprises an NTC thermal switch, and/or

The load (23) comprises an electric motor.

3. The battery charging and discharging circuit according to claim 1, characterized in that the battery charging and discharging circuit comprises a charging circuit (11), the charging circuit (11) being connected between the charging power source (21) and the battery (22) through the charging circuit (17) for charging the battery (22);

the thermo-sensitive switch (12) includes a first thermo-sensitive switch (121); the first thermal switch (121) is connected to the charging circuit (11) and de-energizes the charging circuit (11) when the ambient temperature is below an off threshold of the first thermal switch (121).

4. The battery charging and discharging circuit according to claim 3, wherein the charging circuit (11) comprises a transforming circuit (116), the transforming circuit (116) is connected to the charging power source (21) through the charging circuit (17) for transforming the voltage outputted by the charging power source (21);

the first thermal switch (121) is connected between the charging power supply (21) and the transformer circuit (116).

5. The battery charging and discharging circuit according to claim 4, wherein the charging circuit (11) comprises an input detection circuit (112), the input detection circuit (112) is connected between the charging power source (21) and the transformer circuit (116) through the charging circuit (17) for detecting an output electrical signal of the charging power source (21);

the first thermal switch (121) is connected between the input detection circuit (112) and the charging power supply (21).

6. The battery charging and discharging circuit according to claim 5, characterized in that the battery charging and discharging circuit comprises a filter circuit (111), the filter circuit (111) being connected between the charging power source (21) and the input detection circuit (112) through the charging circuit (17);

the first thermal switch (121) is connected between the filter circuit (111) and the input detection circuit (112); or

The first thermal switch (121) is connected between the charging power supply (21) and the filter circuit (111).

7. The battery charging and discharging circuit according to any of the claims 1 to 6, wherein said thermal switch (12) comprises a second thermal switch (122), said battery charging and discharging circuit comprising a driving circuit (14), said driving circuit (14) being connected between said battery (22) and said load (23) through said discharging line (18) for driving said load (23) to operate;

the second thermal switch (122) is connected between the drive circuit (14) and the battery (22); or

The second thermal switch (122) is connected between the drive circuit (14) and the load (23); or

The second thermal switch (122) is connected between the load (23) and the battery (22).

8. The battery charging and discharging circuit according to claim 1, wherein the turn-off threshold of the thermal switch (12) is less than or equal to 0 degrees celsius and greater than or equal to-5 degrees celsius.

9. The utility model provides a cooking machine which characterized in that, cooking machine includes:

a load (23);

a battery charging and discharging circuit as claimed in any one of claims 1 to 8.

10. The machine of claim 9, wherein the machine comprises an ice cream machine.

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