CN220139383U - Driving circuit and electronic device - Google Patents

Abstract

The application provides a driving circuit and electronic equipment, and relates to the technical field of motor driving, wherein the driving circuit comprises: the device comprises a driving module, a switch module and a control module; the first end of the switch module is connected with the battery module, the second end of the switch module is connected with the first end of the driving module, the second end of the driving module is connected with the motor module, the control module is respectively connected with the controlled end of the switch module and the controlled end of the driving module, the switch module comprises a control switch tube and a control diode, the driving module comprises a driving switch tube and a driving diode, the control module indicates the control switch tube to be conducted, and indicates the driving switch tube to be conducted alternately so as to output direct current signals output by the battery module to the motor module; the reverse direct current signal generated by the motor module can charge the battery module through the driving diode and the control diode. The application realizes reasonable utilization of the reverse direct current signal and improves the service life and the use experience of the electronic equipment.

Description

Driving circuit and electronic device

Technical Field

The present application relates to the field of motor driving technologies, and in particular, to a driving circuit and an electronic device.

Background

Electronic equipment with driving wheels, such as an electric power assisted bicycle, is used for driving according to electric power, and can also be driven under the action of external force so as to realize the requirements of power assistance and the like.

However, when the electronic equipment with the driving wheel is pushed and pulled by external force to cause the driving wheel to rotate, the rotation of the driving wheel can cause the corresponding motor module of the driving wheel to perform electromagnetic induction, reverse voltage can be generated, and the reverse voltage can cause damage to the power supply circuit and the control circuit of the electric power-assisted vehicle to different degrees, so that the service life and the use experience of the electronic equipment are greatly influenced.

Disclosure of Invention

In view of the above, the present utility model provides a driving circuit and an electronic device, so as to solve the influence of reverse voltage on the electronic device and improve the service life and use experience of the electronic device.

In a first aspect, an embodiment of the present utility model provides a driving circuit applied to an electronic device, where the electronic device includes a driving wheel, a battery module, and a motor module, where the motor module is connected to the driving wheel, and the motor module is used to drive the driving wheel to rotate, and the motor module is further used to generate a reverse direct current signal when the driving wheel is driven by an external force, and the driving circuit includes: the device comprises a driving module, a switch module and a control module;

The first end of the switch module is connected with the battery module, the second end of the switch module is connected with the first end of the driving module, the switch module comprises a control switch tube and a control diode, the first end of the control switch tube is connected with the first end of the switch module, the second end of the control switch tube is connected with the second end of the switch module, the cathode of the control diode is connected with the first end of the control switch tube, and the anode of the control diode is connected with the second end of the control switch tube;

the second end of the driving module is connected with the motor module, wherein the driving module comprises a driving switch tube and a driving diode, the first end of the driving switch tube is connected with the first end of the driving module, the second end of the driving switch tube is connected with the second end of the driving module, the anode of the diode is connected with the second end of the driving switch tube, and the cathode of the diode is connected with the first end of the switch tube;

the control module is respectively connected with the controlled end of the switch module and the controlled end of the driving module, and is used for outputting a driving instruction to the switch module and the driving module when receiving driving operation, wherein the driving instruction is used for indicating the switch module to be conducted and indicating a driving switch tube in the driving module to be alternately conducted so as to output a direct current signal output by the battery module to the motor module;

Wherein the reverse direct current signal generated by the motor module can charge the battery module through the driving diode and the control diode.

In one possible implementation, the driving circuit further includes an activation module;

the input end of the activation module is connected with the first end of the switch module, the output end of the activation module is connected with the battery module, the activation module is used for outputting an activation signal to the battery module when receiving the reverse direct current signal, and the activation signal is used for activating a battery management system of the battery module so that the battery management system controls charging.

In one possible implementation, the driving circuit further includes a voltage conversion module;

the input end of the voltage conversion module is connected with the first end of the switch module, the output end of the voltage conversion module is connected with the control module, and the voltage conversion module is used for converting the reverse direct current electric signal and outputting a power supply electric signal to the control module when receiving the reverse direct current electric signal;

the control module is further used for controlling the control switch tube of the switch module to be conducted when detecting that the reverse voltage of the first end of the drive module reaches a first voltage threshold value after receiving the power supply electric signal and completing power-on starting, wherein the reverse voltage is the voltage formed at the first end of the drive module after the reverse direct current electric signal generated by the motor module passes through the drive diode of the drive module.

In a possible implementation manner, the control module is further configured to control the driving switch tube of the driving module to be turned on when detecting that the reverse voltage of the second end of the driving module reaches a second voltage threshold, where the first voltage threshold is smaller than the second voltage threshold.

In one possible implementation, the driving module includes: at least one group of switch tube groups;

the first end of each group of switch tube groups is connected with the first end of the driving module, the second end of each group of switch tube groups is connected with the second end of the driving module, the controlled end of each group of switch tube groups is connected with the control module, and each group of switch tube groups at least comprises a driving switch tube and a driving diode;

each group of switch tube groups is used for being conducted when a driving instruction sent by the control module is received, and is also used for transmitting the reverse direct current electric signal to the second end of the switch module through the driving diode when the driving instruction is not received.

In one possible implementation, each of the switch tube groups includes: the first driving diode, the second driving diode, the first driving switching tube, the second driving switching tube, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor;

The first end of the first driving switch tube is used as the first end of the switch tube group and is connected with the first end of the driving module, the second end of the first driving switch tube is connected with the first end of the second driving switch tube, and the second end of the second driving switch tube is grounded through the first resistor;

the cathode of the first driving diode is connected with the first end of the first driving switch tube, and the anode of the first driving diode is connected with the second end of the first driving switch tube; the cathode of the second driving diode is connected with the first end of the second driving switch tube, and the anode of the second driving diode is connected with the second end of the second driving switch tube;

the controlled end of the first driving switch tube is connected to the control module through a second resistor, and the first capacitor and the third resistor are connected in parallel between the second end of the first driving switch tube and the controlled end of the first driving switch tube;

the controlled end of the second driving switch tube is connected to the control module through a fourth resistor, and the second capacitor and the fifth resistor are connected in parallel between the second end of the second driving switch tube and the controlled end of the second driving switch tube;

The common end of the second end of the first driving switch tube and the first end of the second driving switch tube is connected to the control module through a sixth resistor, and is grounded after passing through a seventh resistor and a third capacitor, and the common end is used as the second end of the switch tube group and is connected with the second end of the driving module;

the first end of the first driving switch tube is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is connected with the second end of the second driving switch tube; the first end of the first driving switch tube is grounded through the fifth capacitor.

In one possible implementation, the switching module includes: the first control switch tube, the second control switch tube, the third control switch tube, the fourth control switch tube, the first control diode, the second control diode, the third control diode, the fourth control diode, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the sixteenth resistor, the first protection diode, the second protection diode, the pre-charge switch tube, the pre-charge diode and the sixth capacitor;

the first end of the first control switch tube is connected with the second end of the second control switch tube, the joint of the first end of the first control switch tube and the second end of the second control switch tube is used as a first common end, and the first common end is used as a first end of the switch module;

The second end of the first control switch tube is connected with the first end of the second control switch tube, and the joint of the second end of the first control switch tube and the first end of the second control switch tube is used as a second common end;

the controlled end of the first control switch tube is connected to the control module through the eighth resistor; the controlled end of the second control switch tube is connected to the control module through the ninth resistor;

the cathode of the first control diode is connected with the first end of the first control switch tube, and the anode of the first control diode is connected with the second end of the first control switch tube; the cathode of the second control diode is connected with the first end of the second control switch tube, and the anode of the second control diode is connected with the second end of the second control switch tube;

the first end of the third control switch tube is connected with the first end of the fourth control switch tube, and the joint of the first end of the third control switch tube and the first end of the fourth control switch tube is used as a third common end; the second end of the third control switch tube is connected with the second end of the fourth control switch tube, and the joint of the second end of the third control switch tube and the second end of the fourth control switch tube is used as a fourth common end;

The controlled end of the third control switch tube is connected to the control module through the tenth resistor; the controlled end of the fourth control switch tube is connected to the control module through the eleventh resistor;

the cathode of the third control diode is connected with the first end of the third control switch tube, and the anode of the third control diode is connected with the second end of the third control switch tube;

the cathode of the fourth control diode is connected with the first end of the fourth control switching tube, and the anode of the fourth control diode is connected with the second end of the fourth control switching tube;

the second public end is connected with the third public end, the connection part of the second public end and the third public end is connected to the control module through the twelfth resistor, the twelfth resistor is connected with the first protection diode in parallel, the anode of the first protection diode is connected with the connection part of the second public end and the third public end, and the cathode of the first protection diode is connected to the control module;

the fourth common terminal is used as a second terminal of the switch module, the fourth common terminal is connected with the anode of the second protection diode, and the cathode of the second protection diode is connected to the control module;

The first end of the pre-charging switch tube is connected with the second end of the third control switch tube, the second end of the pre-charging switch tube is connected to the fourth common end through the thirteenth resistor, and the fourth common end is connected to the control module through the fourteenth resistor; the fourth common terminal is grounded through the sixth capacitor;

the controlled end of the pre-charging switching tube is connected to the control module through the fifteenth resistor; the cathode of the pre-charging diode is connected with the first end of the pre-charging switch tube, and the anode of the pre-charging diode is connected with the second end of the pre-charging switch tube.

In one possible implementation manner, the first control switch tube, the second control switch tube, the third control switch tube and the fourth control switch tube are all MOS tubes, and the first control diode, the second control diode, the third control diode and the fourth control diode are body diodes corresponding to the first control switch tube, the second control switch tube, the third control switch tube and the fourth control switch tube.

In one possible implementation, the activation module includes: activating a switching tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor and a seventh capacitor;

The first end of the activation switch tube is used as an output end of the activation module and is connected with the battery module;

the controlled end of the activated switching tube is connected to the first end of the switching module through the seventeenth resistor and the eighteenth resistor;

the second end of the activation switch tube is grounded; and the nineteenth resistor and the seventh capacitor are connected in parallel between the controlled end of the activation switch tube and the second end of the activation switch tube.

In a second aspect, an embodiment of the present application provides an electronic device, including the driving circuit according to any one of the first aspects.

According to the driving circuit and the electronic equipment, the control module is used for controlling the control switching tube in the switching module to be conducted, controlling the driving switching tube in the driving module to be conducted alternately, and outputting the direct current electric signal output by the battery module to the motor module so as to drive the driving wheel to rotate; the driving diode in the driving module and the control diode in the switching module are used for transmitting the reverse direct current electric signal to the battery module, so that the battery module is charged, the reverse direct current electric signal is reasonably utilized, the influence of the reverse direct current electric signal generated under the action of external force on the electronic equipment is avoided, and the service life and the use experience of the electronic equipment are improved.

Drawings

In order to more clearly illustrate the application or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is one of the schematic structural diagrams of an electronic device shown in an exemplary embodiment of the present application;

fig. 2 is a schematic structural view of a driving module according to an exemplary embodiment of the present application;

fig. 3 is a schematic structural view of a switch tube group shown in an exemplary embodiment of the present application;

fig. 4 is one of schematic structural views of a switch module according to an exemplary embodiment of the present application;

FIG. 5 is a second schematic diagram of a switch module according to an exemplary embodiment of the present application;

FIG. 6 is a second schematic diagram of an electronic device according to an exemplary embodiment of the application;

FIG. 7 is a schematic diagram of an activation module shown in an exemplary embodiment of the present application;

fig. 8 is a third schematic diagram of the electronic device according to an exemplary embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.

The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and the representation may have three relationships, for example, a and/or B may represent: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The terms "first," "second," "third," "fourth" and the like in the description and in the claims and drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

Referring to fig. 1, fig. 1 is one of schematic structural views of an electronic device according to an exemplary embodiment of the present application, and as shown in fig. 1, the electronic device includes a battery module 10, a driving circuit 20, a motor module 30, and a driving wheel 40.

The battery module 10, the driving circuit 20, the motor module 30, and the driving wheel 40 are sequentially connected. In one aspect, the battery module 10 transmits a dc electrical signal to the motor module 30 via the driving circuit 20 to cause the motor module 30 to drive the driving wheel 40 to rotate. On the other hand, when the driving wheel 40 rotates under the external force, the motor module 30 generates a reverse direct current signal, and the motor module 30 transmits the reverse direct current signal to the battery module 10 through the driving circuit 20 to charge the battery module 10. The reverse direct current electric signal may refer to an electric signal flowing from the motor module 30 to the battery module 10 in a direction opposite to the transmission direction of the direct current electric signal.

In some embodiments, the motor module 30 may include a DC brushless motor.

The driving circuit 20 includes a control module 21, a switching module 22, and a driving module 23. The first end 221 of the switch module 22 is connected with the battery module 10, the second end 222 of the switch module 22 is connected with the first end 232 of the driving module 23, the second end 233 of the driving module 23 is connected with the motor module 30, and the control module 21 is connected with the controlled end of the switch module 22 and the controlled end of the driving module 23 respectively.

The switching module 22 may include a control switching tube 223 and a control diode 224, a first end of the control switching tube 223 is connected to the first end 221 of the switching module 22, a second end of the control switching tube 223 is connected to the second end 222 of the switching module 22, a cathode of the control diode 224 is connected to the first end of the control switching tube 223, and an anode of the control diode 224 is connected to the second end of the control switching tube 223.

The driving module 23 may include a driving switching tube 2311 and a driving diode 2312, a first end of the driving switching tube 2311 is connected to the first end 232 of the driving module 23, a second end of the driving switching tube 2311 is connected to the second end 233 of the driving module 23, an anode of the driving diode 2312 is connected to the second end of the driving switching tube 2311, and a cathode of the driving diode 2312 is connected to the first end of the switching tube.

When receiving the driving operation, the control module 21 outputs a driving instruction to the switch module 22 and the driving module 23 according to the driving operation, the driving instruction instructs the control switch tube 223 in the switch module 22 to be turned on, and instructs the driving switch tube 2311 in the driving module 23 to be turned on alternately, so as to output the direct current signal output by the battery module 10 to the motor module 30, so that the motor module 30 can drive the driving wheel 40 to rotate.

In some embodiments, the driving operation may be an operation of the driving electronic device received by the control module 21, and in particular, may be a button operation, a touch operation, a rotation operation, or the like. The driving command may include a turn-on frequency and a duty ratio of the switching tube, etc.

In some embodiments, the control module 21 may output a plurality of driving instructions according to the driving operation. For example, a driving command is transmitted to the switch module 22, and instructs the control switch tube 223 in the switch module 22 to be turned on; another driving command is transmitted to the driving module 23, and instructs the driving switching tube 2311 in the driving module 23 to be alternately turned on.

The reverse direct current signal generated by the motor module 30 can be transmitted to the battery module 10 through the driving diode 2312 in the driving module 23 and the control diode 224 in the switching module 22 to charge the battery module 10.

In this embodiment, the control module 21 controls the control switch tube 223 in the switch module 22 to be turned on, and controls the drive switch tube 2311 in the drive module 23 to be turned on alternately, so as to output the dc signal output by the battery module 10 to the motor module 30, so as to drive the driving wheel 40 to rotate; the reverse direct current electric signal is transmitted to the battery module 10 through the driving diode 2312 in the driving module 23 and the control diode 224 in the switching module 22, so that the battery module is charged, the reverse direct current electric signal is reasonably utilized, the influence of the reverse direct current electric signal generated under the action of external force on the electronic equipment is avoided, and the service life and the use experience of the electronic equipment are improved. In the present application, the number of the control switching transistor 223, the control diode 224, the driving switching transistor 2311, and the driving diode 2312 is not particularly limited.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a driving module 23 according to an exemplary embodiment of the present application, and this embodiment is a further description of the foregoing embodiment, specifically describing: the specific structure of the driving module 23.

The drive module 23 includes at least one set of switch tube sets 231. As shown in fig. 2, the drive module 23 includes three sets of switch tube groups 231. In some embodiments, the drive module 23 may also include two sets of switch tube sets 231 and may also include four sets of switch tube sets 231.

The first end of each group of switch tube sets 231 is connected to the first end 232 of the drive module 23, the second end of each group of switch tube sets 231 is connected to the second end 233 of the drive module 23, and the controlled end of each group of switch tube sets 231 is connected to the control module 21. Each group of the switching tube groups 231 includes at least a driving switching tube 2311 and a driving diode 2312.

When each group of the switching tube groups 231 receives the driving command transmitted from the control module 21, the driving switching tube 2311 in each group of the switching tube groups 231 is turned on according to the driving command, thereby transmitting the direct current signal output from the battery module 10 to the motor module 30.

When each of the switch tube groups 231 does not receive the driving command and the motor module 30 generates the reverse dc signal, the driving diode 2312 in each of the switch tube groups 231 transmits the reverse dc signal to the second end 222 of the switch module 22, and then to the battery module 10 through the switch module 22 to charge the battery module 10.

In this embodiment, the driving module 23 includes at least one group of switch tube groups 231, and each group of switch tube groups 231 includes at least a driving switch tube 2311 and a driving diode 2312, which is beneficial to transmitting the dc signal output from the battery module 10 to the motor module 30 through the driving switch tube 2311 to drive the driving wheel 40 to rotate; it is advantageous to transmit the reverse direct current signal to the battery module 10 via the driving diode 2312 to charge the battery module 10.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a switch tube group 231 according to an exemplary embodiment of the present application, and this embodiment is a further description of the foregoing embodiment, specifically describing: the specific structure of each group of the switch tube groups 231.

As shown in fig. 3, each of the switching tube groups 231 has a structure in which the driving switching tube 2311 of each switching tube group 231 includes a first driving switching tube Q1 and a second driving switching tube Q2, and the driving diode 2312 includes a first driving diode D1 and a second driving diode D2.

The first end of the first driving switch tube Q1 is used as the first end of the switch tube group 231, and is connected with the first end 232 of the driving module 23, the second end of the first driving switch tube Q1 is connected with the first end of the second driving switch tube Q2, and the second end of the second driving switch tube Q2 is grounded through the first resistor R1.

The cathode of the first driving diode D1 is connected with the first end of the first driving switch tube Q1, and the anode of the first driving diode D1 is connected with the second end of the first driving switch tube Q1. The cathode of the second driving diode D2 is connected with the first end of the second driving switch tube Q2, and the anode of the second driving diode D2 is connected with the second end of the second driving switch tube Q2.

The controlled end of the first driving switch tube Q1 is connected to the control module 21 through a second resistor R2, and a first capacitor C1 and a third resistor R3 are connected in parallel between the second end of the first driving switch tube Q1 and the controlled end of the first driving switch tube Q1.

The second resistor R2 forms an RC filter with the first capacitor C1 to limit the instantaneous large current spike flowing through the first driving switch Q1. In addition, parasitic capacitance and inductance may exist between the first driving switch Q1 and the circuit board, and the second resistor R2 may also suppress an oscillation signal generated by the parasitic capacitance and inductance.

Because parasitic capacitance exists in the first driving switch tube Q1, in the high-speed switch state, the electric quantity stored by the parasitic capacitance needs to be discharged, otherwise, the first driving switch tube Q1 is damaged. Therefore, the third resistor R3 is used for forming a bleed path between the second end of the first driving switch Q1 and the controlled end of the first driving switch Q1, so as to avoid the damage of the electric quantity of the parasitic capacitor to the first driving switch Q1.

The controlled end of the second driving switch tube Q2 is connected to the control module 21 through a fourth resistor R4, and a second capacitor C2 and a fifth resistor R5 are connected in parallel between the second end of the second driving switch tube Q2 and the controlled end of the second driving switch tube Q2. The fourth resistor R4 and the second resistor R2 function similarly, the second capacitor C2 and the first capacitor C1 function similarly, and the fifth resistor R5 and the third resistor R3 function similarly, so that repetition is avoided and detailed description is omitted.

The connection between the second end of the first driving switch tube Q1 and the first end of the second driving switch tube Q2 is used as a common end, the common end is used as the second end of the switch tube group 231, the second end 233 of the driving module 23 is connected, one end of the common end is connected to the control module 21 through the sixth resistor R6, and the other end of the common end is grounded through the seventh resistor R7 and the third capacitor C3.

The sixth resistor R6 can avoid the damage of the switching tube caused by the direct connection of the control module 21 with the switching tube. The seventh resistor R7 and the third capacitor C3 form an RC snubber loop to reduce switching losses of the first and second driving switching transistors Q1 and Q2, absorb current spikes, and improve electromagnetic interference (Electromagnetic Interference, EMI) characteristics.

The first end of the first driving switch tube Q1 is connected with the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected with the second end of the second driving switch tube Q2. The fourth capacitor C4 is used for filtering. In some embodiments, the fourth capacitor C4 may include at least one capacitor, and the specific number and the capacitance value may be flexibly set according to practical situations, which is not limited in the present application.

The first end of the first driving switch Q1 is grounded via a fifth capacitor C5. In one aspect, the fifth capacitor C5 is configured to store electric energy; on the other hand, since the power of the electronic device for instant start is large, the fifth capacitor C5 can stabilize the voltage of the second terminal 222 of the switch module 22. Assuming that the fifth capacitor C5 is absent, the voltage at the second terminal 222 of the switch module 22 drops instantaneously.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a switch module 22 according to an exemplary embodiment of the present application, and this embodiment is further described in the foregoing embodiments, specifically: the specific structure of the switch module 22.

As shown in fig. 4, the switching module 22 includes a first control switching tube Q3, a second control switching tube Q4, a third control switching tube Q5, and a fourth control switching tube Q6, and further includes a first control diode D3, a second control diode D4, a third control diode D5, and a fourth control diode D6.

The cathode of the first control diode D3 is connected with the first end of the first control switch tube Q3, and the anode of the first control diode D3 is connected with the second end of the first control switch tube Q3. The cathode of the second control diode D4 is connected with the first end of the second control switch tube Q4, and the anode of the second control diode D4 is connected with the second end of the second control switch tube Q4. The cathode of the third control diode D5 is connected with the first end of the third control switch tube Q5, and the anode of the third control diode D5 is connected with the second end of the third control switch tube Q5. The cathode of the fourth control diode D6 is connected to the first end of the fourth control switch Q6, and the anode of the fourth control diode D6 is connected to the second end of the fourth control switch Q6.

The first end of the first control switch tube Q3 is connected to the second end of the second control switch tube Q4, and the connection between the first end of the first control switch tube Q3 and the second end of the second control switch tube Q4 is used as a first common end, and the first common end is used as the first end 221 of the switch module 22.

The second end of the first control switch tube Q3 is connected with the first end of the second control switch tube Q4, and the joint of the second end of the first control switch tube Q3 and the first end of the second control switch tube Q4 is used as a second common end.

The controlled end of the first control switch Q3 is connected to the control module 21 via an eighth resistor R8, where the eighth resistor R8 is used to limit the current flowing through the first control switch Q3. The controlled end of the second control switch Q4 is connected to the control module 21 via a ninth resistor R9, and the ninth resistor R9 is used to limit the current flowing through the second control switch Q4.

The first end of the third control switch tube Q5 is connected with the first end of the fourth control switch tube Q6, and the joint of the first end of the third control switch tube Q5 and the first end of the fourth control switch tube Q6 is used as a third common end. The second end of the third control switch tube Q5 is connected with the second end of the fourth control switch tube Q6, and the joint of the second end of the third control switch tube Q5 and the second end of the fourth control switch tube Q6 is used as a fourth common end.

The controlled end of the third control switch Q5 is connected to the control module 21 via a tenth resistor R10, and the tenth resistor R10 is used to limit the current flowing through the third control switch Q5. The controlled end of the fourth control switch Q6 is connected to the control module 21 via an eleventh resistor R11, where the eleventh resistor R11 is used to limit the current flowing through the fourth control switch Q6. The control module 21 controls the conduction of the first control switch tube Q3, the second control switch tube Q4, the third control switch tube Q5 and the fourth control switch tube Q6.

The second common terminal is connected with the third common terminal, the junction of the second common terminal and the third common terminal is connected to the control module 21 through a twelfth resistor R12, the twelfth resistor R12 is connected with a first protection diode D7 in parallel, the anode of the first protection diode D7 is connected with the junction of the second common terminal and the third common terminal, the cathode of the first protection diode D7 is connected to the control module 21, the first protection diode D7 is used for carrying out reverse breakdown to protect the first control switch tube Q3 and the second control switch tube Q4 when the voltages of the first control switch tube Q3 and the second control switch tube Q4 are excessively large.

The fourth common terminal serves as the second terminal 222 of the switching module 22, the fourth common terminal being connected to the anode of the second protection diode D8, the cathode of the second protection diode D8 being connected to the control module 21. The second protection diode D8 is used for reverse breakdown to protect the third control switch Q5 and the fourth control switch Q6 when the voltages input to the third control switch Q5 and the fourth control switch Q6 are too high.

As shown in fig. 4, the switch module 22 further includes a pre-charge switch Q7 and a pre-charge diode D9, wherein a first end of the pre-charge switch Q7 is connected to a second end of the third control switch Q5, a second end of the pre-charge switch Q7 is connected to a fourth common end through a thirteenth resistor R13, and the fourth common end is connected to the control module 21 through a fourteenth resistor R14. The fourth common terminal is also grounded via a sixth capacitor C6.

The controlled end of the pre-charge switching tube Q7 is connected to the control module 21 through a fifteenth resistor R15, and the conduction of the pre-charge switching tube Q7 is controlled by the control module. A sixteenth resistor R16 is connected in parallel between the first end of the precharge switching tube Q7 and the controlled end of the precharge switching tube Q7.

The cathode of the pre-charge diode D9 is connected with the first end of the pre-charge switching tube Q7, and the anode of the pre-charge diode D9 is connected with the second end of the pre-charge switching tube Q7.

The switching module 22 operates as follows: the direct current signal of the battery module 10 is transmitted from the first terminal 221 of the switch module 22 to the second terminal 222 of the switch module 22 through the conduction of the first control switch tube Q3, the second control switch tube Q4, the third control switch tube Q5 and the fourth control switch tube Q6.

When the reverse dc signal is present, the first control diode D3, the third control diode D5 and the fourth control diode D6 may transmit the reverse dc signal to the first end 221 of the switch module 22, and when the reverse dc signal reaches the preset threshold, the first control switch Q3, the second control switch Q4, the third control switch Q5 and the fourth control switch Q6 are controlled to be turned on, and the first control switch Q3, the second control switch Q4, the third control switch Q5 and the fourth control switch Q6 are turned on, so as to transmit the reverse dc signal from the second end 222 of the switch module 22 to the first end 221 of the switch module 22.

In addition, when the switch module 22 needs to be started for charging and discharging, the precharge switch tube Q7 is turned on to precharge the sixth capacitor C6, the voltage of the second end 222 of the switch module 22 is increased, and when the sixth capacitor C6 is charged to a preset voltage, the precharge switch tube Q7 is turned off, so as to turn on the charge control switch or the discharge control switch.

In some embodiments, the switch module 22 may still function properly in the event that one of the first control switch tube Q3 and the second control switch tube Q4 is damaged and/or one of the third control switch tube Q5 and the fourth control switch tube Q6 is damaged, thereby improving the risk resistance of the switch module 22.

For example, in the case where the first control switching tube Q3 is damaged, the reverse direct current electric signal and the direct current electric signal may be transmitted through the turned-on second control switching tube Q4, third control switching tube Q5, and fourth control switching tube Q6.

For example, in the case where the fourth control switching tube Q6 is damaged, the reverse direct current electric signal and the direct current electric signal can be transmitted through the turned-on first control switching tube Q3, second control switching tube Q4, and third control switching tube Q5.

For example, in the case where the second control switching tube Q4 and the fourth control switching tube Q6 are damaged, the reverse direct current electric signal and the direct current electric signal can be transmitted through the turned-on first control switching tube Q3 and third control switching tube Q5.

In the present embodiment, a plurality of control switching tubes are provided for realizing the current flow through the switching module 22 to be split, so as to reduce damage to the control switching tubes by excessive current. It should be noted that, in other embodiments, the control switch tube may include only 1, or more.

In some embodiments, the first control switch tube Q3 and the third control switch tube Q5 may constitute a discharge control switch, and the second control switch tube Q4 and the fourth control switch tube Q6 may constitute a charge control switch.

When the discharging control switch is turned on and the charging control switch is turned off, that is, the first control switch tube Q3 and the third control switch tube Q5 are both turned on, the second control switch tube Q4 and the fourth control switch tube Q6 are both turned off, and the direct current signal of the battery module 10 is transmitted from the first end 221 of the switch module 22 to the second end 222 of the switch module 22 through the turned-on first control switch tube Q3 and the turned-on third control switch tube Q5, so as to realize the discharging of the battery module 10.

When the discharging control switch is turned off and the charging control switch is turned on, that is, the first control switch tube Q3 and the third control switch tube Q5 are turned off, the second control switch tube Q4 and the fourth control switch tube Q6 are turned on, and the reverse direct current electric signal is transmitted from the second end 222 of the switch module 22 to the first end 221 of the switch module 22 through the turned-on two control switch tube Q4 and the turned-on fourth control switch tube Q6, so as to realize charging of the battery module 10.

When the discharging control switch is turned off and the charging control switch is turned off, that is, the first control switch tube Q3, the third control switch tube Q5, the second control switch tube Q4 and the fourth control switch tube Q6 are all turned off, the reverse direct current signal is transmitted from the second end 222 of the switch module 22 to the first end 221 of the switch module 22 through the first control diode D3, the third control diode D5 and the fourth control diode D6, so as to realize charging of the battery module 10.

In some embodiments, the first control switch Q3, the second control switch Q4, the third control switch Q5, and the fourth control switch Q6 are all MOS transistors. The type of the MOS transistor is not particularly limited. The first control switch tube Q3, the second control switch tube Q4, the third control switch tube Q5 and the fourth control switch tube Q6 may be the same type of MOS tube, or may be different types of MOS tubes.

In some embodiments, the first control diode D3 may be a body diode of the first control switch Q3, the second control diode D4 may be a body diode of the second control diode Q4, the third control diode D5 may be a body diode of the third control switch Q5, and the fourth control diode D6 may be a body diode of the fourth control switch Q6.

The first control diode D3, the second control diode D4, the third control diode D5 and the fourth control diode D6 are body diodes corresponding to the MOS tubes, so that the situation that the diodes are arranged outside the MOS tubes can be avoided, and the space of a circuit board is saved.

Referring to fig. 5, fig. 5 is a second schematic diagram of a switch module 22 according to an exemplary embodiment of the present application, and this embodiment is further described in the foregoing embodiments, specifically: the first end and the second end of the first control switch tube Q3, the second control switch tube Q4, the third control switch tube Q5 and the fourth control switch tube Q6 all comprise multiports.

In some embodiments, the number of ports at the first end and the number of ports at the second end of the same switching tube or different switching tubes may be the same. For example, as shown in fig. 5, the first and second ends of the first, second, third, and fourth control switching transistors Q3, Q4, Q5, and Q6 each include 4 ports.

In some embodiments, the number of ports at the first end and the number of ports at the second end of the same switching tube may be different. For example, the first terminal of the first control switching tube Q3 includes 4 ports, and the second terminal of the first control switching tube Q3 includes 3 ports.

In some embodiments, the number of ports at the first ends of different switching tubes may be different. For example, the first end of the first control switching tube Q3 includes 4 ports, and the first end of the second control switching tube Q4 includes 3 ports.

In this embodiment, the first end and the second end of the first control switch tube Q3, the second control switch tube Q4, the third control switch tube Q5 and the fourth control switch tube Q6 are set to be multiport, and the multiport can improve the heat dissipation effect of the switch tube, so as to control the switch tube to bear larger current.

Referring to fig. 6, fig. 6 is a second schematic structural diagram of an electronic device according to an exemplary embodiment of the present application, which is a further improvement of the foregoing embodiment, and the main improvement is that: the drive circuit 20 further includes an activation module 24.

An input of the activation module 24 is connected to the first end 221 of the switch module 22 and an output of the activation module 25 is connected to the battery module 10.

When the activation module 24 receives the reverse dc signal through the switch module 22, the activation module 24 converts the reverse dc signal into an activation signal and outputs the activation signal to the battery module 10. The activation signal may activate the battery management system 11 of the battery module 10 to cause the battery management system 11 to control charging.

In some embodiments, the activation signal is a signal that may activate the battery management system 11 to begin operation. Such as a low level signal, a high level signal, etc.

In some embodiments, after the battery management system 11 receives the activation signal, the battery management system 11 starts to operate, and the battery management system 11 allows the battery module 10 to receive the reverse dc signal transmitted by the switch module 22, so as to implement charging control on the battery module 10.

In this embodiment, the activation module 24 converts the reverse dc signal into an activation signal, and the activation signal activates the battery management system 11 of the battery module 10 to control the charging of the battery module 10.

Referring to fig. 7, fig. 7 is a schematic structural diagram of an activation module 24 according to an exemplary embodiment of the present application, and this embodiment is a further description of the foregoing embodiment, specifically describing: the specific structure of the activation module 24.

The specific structure of the activation module 24 is shown in fig. 7, where the first end of the activation switch Q8 is used as the output end of the activation module 24 and is connected to the battery module 10. The controlled terminal of the activation switching tube Q8 is connected to the first terminal 221 of the switching module 22 via a seventeenth resistor R17 and an eighteenth resistor R18. The second terminal of the activation switch Q8 is grounded. A nineteenth resistor R19 and a seventh capacitor C7 are connected in parallel between the controlled end of the activation switch Q8 and the second end of the activation switch.

The seventeenth resistor R17, the eighteenth resistor R18 and the seventh capacitor C7 form an RC filter to limit the instantaneous large current spike through the active switching tube Q8. In addition, parasitic capacitance and inductance may exist between the active switching tube Q8 and the circuit board, and the seventeenth resistor R17 and the eighteenth resistor R18 may also suppress oscillation.

Because of the parasitic capacitance in the active switching tube Q8, in the high-speed switching state, the electric quantity stored in the parasitic capacitance needs to be discharged, otherwise, the active switching tube Q8 is damaged. Therefore, the nineteenth resistor R19 is used to form a bleed path between the second terminal of the activation switch Q8 and the controlled terminal of the activation switch Q8, so as to avoid the damage to the activation switch Q8 caused by the electric quantity of the parasitic capacitance.

The controlled end of the activation switch Q8 receives the reverse direct current signal transmitted by the switch module 22, and when the reverse direct current signal is greater than a certain threshold value, the conduction of the activation switch Q8 is controlled.

After the activation switch Q8 is turned on, the first terminal of the activation switch Q8 is pulled down, and a low level signal, that is, an activation signal, is output to activate the battery management system 11 in the battery module 10.

Referring to fig. 8, fig. 8 is a third schematic structural diagram of an electronic device according to an exemplary embodiment of the present application, which is a further improvement of the foregoing embodiment, and the main improvement is that: the driving circuit 20 further comprises a voltage conversion module 25.

The input of the voltage conversion module 25 is connected to the first end 221 of the switching module 22 and the output of the voltage conversion module 25 is connected to the control module 21.

The voltage conversion module 25 receives the reverse direct current signal transmitted through the control diode 224 of the switching module 22, converts the reverse direct current signal into a power supply electrical signal, and transmits the power supply electrical signal to the control module 21.

After receiving the power supply signal and completing the power-on start, the control module 21 detects the reverse voltage of the first end 232 of the driving module 23. The reverse voltage is a voltage formed at the first end 232 of the driving module 23 after the reverse direct current signal generated by the motor module 30 passes through the driving diode 2312 of the driving module 23.

When the control module 21 detects that the reverse voltage at the first end 232 of the driving module 23 reaches the first voltage threshold, the control switch tube 223 of the control switch module 22 is turned on, so that the control switch tube 223 of the switch module 22 transmits the reverse direct current electric signal, and the control diode 224 is prevented from transmitting the reverse direct current electric signal for a long time to be damaged.

In some embodiments, the control module 21 further detects the reverse voltage of the second end 233 of the driving module 23, when the control module 21 detects that the reverse voltage of the second end 233 of the driving module 23 reaches the second voltage threshold, the first voltage threshold is smaller than the second voltage threshold, and the control module 21 controls the driving switch tube 2311 of the driving module 23 to be turned on, so that the driving switch tube 2311 of the driving module 23 transmits the reverse direct current electric signal, and the driving diode 2312 is prevented from transmitting the reverse direct current electric signal for a long time to be damaged.

In some embodiments, the control module 21 may detect the reverse voltage of the first end 232 of the driving module 23 and the reverse voltage of the second end 233 of the driving module 23 through a current detection circuit or a voltage detection circuit.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application.

Claims (10)

1. The utility model provides a drive circuit, its characterized in that is applied to electronic equipment, electronic equipment includes drive wheel, battery module and motor module, motor module connects the drive wheel, motor module is used for the drive wheel rotates, motor module is still used for when the drive wheel is at external force drive, reverse direct current signal of production, drive circuit includes: the device comprises a driving module, a switch module and a control module;

the first end of the switch module is connected with the battery module, the second end of the switch module is connected with the first end of the driving module, the switch module comprises a control switch tube and a control diode, the first end of the control switch tube is connected with the first end of the switch module, the second end of the control switch tube is connected with the second end of the switch module, the cathode of the control diode is connected with the first end of the control switch tube, and the anode of the control diode is connected with the second end of the control switch tube;

The second end of the driving module is connected with the motor module, wherein the driving module comprises a driving switch tube and a driving diode, the first end of the driving switch tube is connected with the first end of the driving module, the second end of the driving switch tube is connected with the second end of the driving module, the anode of the driving diode is connected with the second end of the driving switch tube, and the cathode of the driving diode is connected with the first end of the switch tube;

the control module is respectively connected with the controlled end of the switch module and the controlled end of the driving module, and is used for outputting a driving instruction to the switch module and the driving module when receiving driving operation, wherein the driving instruction is used for indicating the switch module to be conducted and indicating a driving switch tube in the driving module to be alternately conducted so as to output a direct current signal output by the battery module to the motor module;

wherein the reverse direct current signal generated by the motor module can charge the battery module through the driving diode and the control diode.

2. The drive circuit of claim 1, further comprising an activation module;

The input end of the activation module is connected with the first end of the switch module, the output end of the activation module is connected with the battery module, the activation module is used for outputting an activation signal to the battery module when receiving the reverse direct current signal, and the activation signal is used for activating a battery management system of the battery module so that the battery management system controls charging.

3. The drive circuit of claim 1, further comprising a voltage conversion module;

the input end of the voltage conversion module is connected with the first end of the switch module, the output end of the voltage conversion module is connected with the control module, and the voltage conversion module is used for converting the reverse direct current electric signal and outputting a power supply electric signal to the control module when receiving the reverse direct current electric signal;

the control module is further used for controlling the control switch tube of the switch module to be conducted when detecting that the reverse voltage of the first end of the drive module reaches a first voltage threshold value after receiving the power supply electric signal and completing power-on starting, wherein the reverse voltage is the voltage formed at the first end of the drive module after the reverse direct current electric signal generated by the motor module passes through the drive diode of the drive module.

4. A driving circuit according to claim 3, wherein the control module is further configured to control the driving switch of the driving module to be turned on when detecting that the reverse voltage of the second end of the driving module reaches a second voltage threshold, wherein the first voltage threshold is smaller than the second voltage threshold.

5. The drive circuit of claim 1, wherein the drive module comprises: at least one group of switch tube groups;

the first end of each group of switch tube groups is connected with the first end of the driving module, the second end of each group of switch tube groups is connected with the second end of the driving module, the controlled end of each group of switch tube groups is connected with the control module, and each group of switch tube groups at least comprises a driving switch tube and a driving diode;

each group of switch tube groups is used for being conducted when a driving instruction sent by the control module is received, and is also used for transmitting the reverse direct current electric signal to the second end of the switch module through the driving diode when the driving instruction is not received.

6. The drive circuit of claim 5, wherein each of the switch tube sets comprises: the first driving diode, the second driving diode, the first driving switch tube, the second driving switch tube, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor;

The first end of the first driving switch tube is used as the first end of the switch tube group and is connected with the first end of the driving module, the second end of the first driving switch tube is connected with the first end of the second driving switch tube, and the second end of the second driving switch tube is grounded through the first resistor;

the cathode of the first driving diode is connected with the first end of the first driving switch tube, and the anode of the first driving diode is connected with the second end of the first driving switch tube; the cathode of the second driving diode is connected with the first end of the second driving switch tube, and the anode of the second driving diode is connected with the second end of the second driving switch tube;

the controlled end of the first driving switch tube is connected to the control module through a second resistor, and the first capacitor and the third resistor are connected in parallel between the second end of the first driving switch tube and the controlled end of the first driving switch tube;

the controlled end of the second driving switch tube is connected to the control module through a fourth resistor, and the second capacitor and the fifth resistor are connected in parallel between the second end of the second driving switch tube and the controlled end of the second driving switch tube;

The common end of the second end of the first driving switch tube and the first end of the second driving switch tube is connected to the control module through a sixth resistor, and is grounded after passing through a seventh resistor and a third capacitor, and the common end is used as the second end of the switch tube group and is connected with the second end of the driving module;

the first end of the first driving switch tube is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is connected with the second end of the second driving switch tube; the first end of the first driving switch tube is grounded through the fifth capacitor.

7. The drive circuit of claim 1, wherein the switching module comprises: the first control switch tube, the second control switch tube, the third control switch tube, the fourth control switch tube, the first control diode, the second control diode, the third control diode, the fourth control diode, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the fifteenth resistor, the sixteenth resistor, the first protection diode, the second protection diode, the pre-charge switch tube, the pre-charge diode and the sixth capacitor;

The first end of the first control switch tube is connected with the second end of the second control switch tube, the joint of the first end of the first control switch tube and the second end of the second control switch tube is used as a first common end, and the first common end is used as a first end of the switch module;

the second end of the first control switch tube is connected with the first end of the second control switch tube, and the joint of the second end of the first control switch tube and the first end of the second control switch tube is used as a second common end;

the controlled end of the first control switch tube is connected to the control module through the eighth resistor; the controlled end of the second control switch tube is connected to the control module through the ninth resistor;

the cathode of the first control diode is connected with the first end of the first control switch tube, and the anode of the first control diode is connected with the second end of the first control switch tube; the cathode of the second control diode is connected with the first end of the second control switch tube, and the anode of the second control diode is connected with the second end of the second control switch tube;

the first end of the third control switch tube is connected with the first end of the fourth control switch tube, and the joint of the first end of the third control switch tube and the first end of the fourth control switch tube is used as a third common end; the second end of the third control switch tube is connected with the second end of the fourth control switch tube, and the joint of the second end of the third control switch tube and the second end of the fourth control switch tube is used as a fourth common end;

The controlled end of the third control switch tube is connected to the control module through the tenth resistor; the controlled end of the fourth control switch tube is connected to the control module through the eleventh resistor;

the cathode of the third control diode is connected with the first end of the third control switch tube, and the anode of the third control diode is connected with the second end of the third control switch tube;

the cathode of the fourth control diode is connected with the first end of the fourth control switching tube, and the anode of the fourth control diode is connected with the second end of the fourth control switching tube;

the second public end is connected with the third public end, the connection part of the second public end and the third public end is connected to the control module through the twelfth resistor, the twelfth resistor is connected with the first protection diode in parallel, the anode of the first protection diode is connected with the connection part of the second public end and the third public end, and the cathode of the first protection diode is connected to the control module;

the fourth common terminal is used as a second terminal of the switch module, the fourth common terminal is connected with the anode of the second protection diode, and the cathode of the second protection diode is connected to the control module;

The first end of the pre-charging switch tube is connected with the second end of the third control switch tube, the second end of the pre-charging switch tube is connected to the fourth common end through the thirteenth resistor, and the fourth common end is connected to the control module through the fourteenth resistor; the fourth common terminal is grounded through the sixth capacitor;

the controlled end of the pre-charging switching tube is connected to the control module through the fifteenth resistor; the sixteenth resistor is connected in parallel between the first end of the pre-charging switch tube and the controlled end of the pre-charging switch tube; the cathode of the pre-charging diode is connected with the first end of the pre-charging switch tube, and the anode of the pre-charging diode is connected with the second end of the pre-charging switch tube.

8. The driving circuit of claim 7, wherein the first control switch tube, the second control switch tube, the third control switch tube and the fourth control switch tube are all MOS tubes, and the first control diode, the second control diode, the third control diode and the fourth control diode are body diodes corresponding to the first control switch tube, the second control switch tube, the third control switch tube and the fourth control switch tube.

9. The drive circuit of claim 2, wherein the activation module comprises: activating a switching tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor and a seventh capacitor;

the first end of the activation switch tube is used as an output end of the activation module and is connected with the battery module;

the controlled end of the activated switching tube is connected to the first end of the switching module through the seventeenth resistor and the eighteenth resistor;

the second end of the activation switch tube is grounded; and the nineteenth resistor and the seventh capacitor are connected in parallel between the controlled end of the activation switch tube and the second end of the activation switch tube.

10. An electronic device, comprising: battery module and motor module, and drive circuit according to any one of claims 1-9.