CN216783708U - Power supply circuit of electric power-assisted bicycle - Google Patents
Power supply circuit of electric power-assisted bicycle Download PDFInfo
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- CN216783708U CN216783708U CN202220552008.9U CN202220552008U CN216783708U CN 216783708 U CN216783708 U CN 216783708U CN 202220552008 U CN202220552008 U CN 202220552008U CN 216783708 U CN216783708 U CN 216783708U
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Abstract
The utility model provides a power supply circuit of an electric power-assisted bicycle, which relates to the field of electric power-assisted bicycles, wherein an instrument comprises: the device comprises a switch key circuit, a first power supply circuit, a first self-locking circuit and an instrument control unit; the controller comprises a second power supply circuit, a second self-locking circuit and an electric power assisting control unit; the battery is respectively and electrically connected with the input ends of the first power supply circuit and the second power supply circuit; the output end of the first power supply circuit and the first output end of the second power supply circuit are respectively and electrically connected with the power supply ends of the instrument control unit and the electric power assisting control unit; the switch key circuit is electrically connected with the control end of the second power supply circuit; the first output end of the electric power assisting control unit is electrically connected with a second self-locking circuit, and the second self-locking circuit is electrically connected with the control end of a second power supply circuit; the second output end of the electric power assisting control unit is also electrically connected with a first self-locking circuit, and the first self-locking circuit is electrically connected with the control end of the first power supply circuit. By adopting the utility model, the safety of the electric power-assisted bicycle can be improved.
Description
Technical Field
The utility model relates to the field of electric power-assisted bicycles, in particular to a power supply circuit of an electric power-assisted bicycle.
Background
The electric power-assisted bicycle is one of bicycles, and different torque and rotating speed are output by the torque of a pedal treaded by a person when the person rides the bicycle, so that the power-assisted riding function is realized. The bicycle is a mechatronic personal vehicle which is provided with a motor, a controller, a battery, a meter, a sensor and other components on the basis of a common bicycle and usually takes a battery as an auxiliary energy source. The instrument is an essential part of the electric power-assisted bicycle and is used for displaying relevant motion parameters of the electric power-assisted bicycle, and a switch key is usually arranged on the instrument and used for controlling the battery to power on and power off other components.
With the popularization of the electric power-assisted bicycle, the practicability and stability of the instrument become more important, and the electric safety requirement of the electric power-assisted bicycle is also improved in the European Union electric power-assisted bicycle standard. In the prior art, when the battery is not powered on, the battery generally supplies power to the instrument firstly and then supplies power to the controller after a switch key of the instrument is pressed.
And such power supply mode makes the unable control battery of controller conduct the control part give the process of instrument power supply, leads to the controller can't monitor electric bicycle's the power-on process comprehensively, also is not convenient for electric bicycle when bringing the potential safety hazard and carries out the problem maintenance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a power supply circuit of an electric power-assisted bicycle, which can improve the safety of the electric power-assisted bicycle.
The utility model provides a power supply circuit of an electric power-assisted bicycle, which comprises: batteries, meters, controllers; the meter includes: the device comprises a switch key circuit, a first power supply circuit, a first self-locking circuit and an instrument control unit; the controller comprises a second power supply circuit, a second self-locking circuit and an electric power assisting control unit;
the battery is respectively and electrically connected with the input ends of the first power supply circuit and the second power supply circuit; the output end of the first power supply circuit and the first output end of the second power supply circuit are respectively and electrically connected with the power ends of the instrument control unit and the electric power assisting control unit;
the switch key circuit is electrically connected with the control end of the second power supply circuit so as to control the second power supply circuit to power on the electric power assisting control unit when the switch key circuit receives input pressing operation; the first output end of the electric power assisting control unit is electrically connected with the second self-locking circuit, the second self-locking circuit is electrically connected with the control end of the second power supply circuit, and therefore when the switch key circuit receives a releasing operation, the second power supply circuit is controlled to continuously supply power to the electric power assisting control unit;
the second output end of the electric power assisting control unit is also electrically connected with the first self-locking circuit, and the first self-locking circuit is electrically connected with the control end of the first power supply circuit so as to control the first power supply circuit to supply power to the instrument control unit.
Optionally, the switch key circuit includes: the key switch, the first resistor and the first diode;
one end of the key switch is grounded through the first resistor, the other end of the key switch is electrically connected with the cathode of the first diode, and the anode of the first diode is electrically connected with the control end of the second power supply circuit.
Optionally, the second power supply circuit includes a second resistor, a filtering unit, a first switching tube, and a first dc voltage reducer; one end of the second resistor is a control end of the second power supply circuit, the other end of the second resistor is electrically connected with a control end of the first switch tube, a power end of the first switch tube is electrically connected with the battery, a filtering unit is electrically connected between the power end of the first switch tube and the control end of the first switch tube, an output end of the first switch tube is electrically connected with an input end of the first direct current step-down transformer, and an output end of the first direct current step-down transformer is a first output end of the second power supply circuit.
Optionally, the second power supply circuit further comprises: the anode of the second diode is electrically connected with the output end of the first switch tube, the cathode of the second diode is electrically connected with one end of the magnetic bead, the other end of the magnetic bead is the second output end of the second power supply circuit, and the second output end of the second power supply circuit is electrically connected with the power ends of other power utilization units in the electric power-assisted bicycle.
Optionally, the first switch tube is a PNP triode, the control end of the first switch tube is a base, the power end of the first switch tube is an emitter, and the output end of the first switch tube is a collector.
Optionally, the second self-locking circuit includes a fourth resistor, a fifth resistor, and a second switching tube; a first output end of the electric power assisting control unit is electrically connected with a control end of the second switching tube through the fourth resistor; the power end of the second switching tube is grounded, the fifth resistor is electrically connected between the power end and the control end of the second switching tube, and the output end of the second switching tube is electrically connected with the control end of the second power supply circuit.
Optionally, the second switching tube is an NPN triode, the control end of the second switching tube is a base, the power end of the second switching tube is an emitter, and the output end of the second switching tube is a collector.
Optionally, the first power supply circuit includes a sixth resistor, a seventh resistor, a third switching tube, and a second dc voltage reducer; the sixth resistor is electrically connected between the control end of the third switching tube and the first self-locking circuit, the power end of the third switching tube is electrically connected with the battery, the battery is also electrically connected with the control end of the third switching tube through the seventh resistor, the output end of the third switching tube is electrically connected with the input end of the second direct current voltage reducer, and the output end of the second direct current voltage reducer is the output end of the first power supply circuit.
Optionally, the first self-locking circuit includes an eighth resistor, a ninth resistor, and a fourth switching tube; the input end of the fourth switching tube is grounded, the control end of the fourth switching tube is electrically connected with one end of the eighth resistor, and the other end of the eighth resistor is electrically connected with the second output end of the electric power assisting control unit; and the ninth resistor is electrically connected between the control end and the input end of the fourth switching tube, and the output end of the fourth switching tube is electrically connected with the control end of the first power supply circuit.
Optionally, the meter control unit is communicatively connected to a third output of the electric power assist control unit.
The utility model provides a power supply circuit of an electric power-assisted bicycle, which comprises a battery, an instrument and a controller, wherein the battery is connected with the instrument; the instrument comprises a switch key circuit, a first power supply circuit, a first self-locking circuit and an instrument control unit; the controller comprises a second power supply circuit, a second self-locking circuit and an electric power assisting control unit; the battery is respectively and electrically connected with the input ends of the first power supply circuit and the second power supply circuit; the output end of the first power supply circuit and the first output end of the second power supply circuit are respectively and electrically connected with the power supply ends of the instrument control unit and the electric power assisting control unit; the switch key circuit is electrically connected with the control end of the second power supply circuit; the first output end of the electric power assisting control unit is electrically connected with a second self-locking circuit, and the second self-locking circuit is electrically connected with the control end of a second power supply circuit; the second output end of the electric power assisting control unit is also electrically connected with a first self-locking circuit, and the first self-locking circuit is electrically connected with the control end of the first power supply circuit. Through the connection mode, when the switch key circuit is switched on and off, the battery firstly supplies power to the second power supply circuit in the controller, so that the second power supply circuit supplies power to the electric power assisting control unit; after switch button circuit opens circuit, the second supply circuit still can last to the power supply of electric power assisted control unit, simultaneously after the controller normally works, the battery supplies power to instrument control unit through first supply circuit, reach the power supply purpose of supplying power to the controller earlier after the switch button circuit and then supplying power to the instrument, make the controller can be at the power-on process of other subassemblies of power assisted bicycle of back control, make the power-on process of electric power assisted bicycle more safe and reliable, guarantee electric power assisted bicycle's stability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a power supply circuit of an electric power assisted bicycle provided by the utility model;
fig. 2 is a schematic structural diagram of a switch key circuit provided in the present invention;
fig. 3 is a schematic structural diagram of a second power supply circuit provided in the present invention;
fig. 4 is a schematic structural diagram of another second power supply circuit provided in the present invention;
FIG. 5 is a schematic structural diagram of a second self-locking circuit according to the present invention;
fig. 6 is a schematic structural diagram of a first power supply circuit according to the present invention;
fig. 7 is a schematic structural diagram of a first self-locking circuit according to the present invention;
fig. 8 is a schematic structural diagram of a power supply circuit of another electric power assisted bicycle provided by the utility model.
Icon: 1, a battery; 2, a meter; 3, a controller; 21, switching a key circuit; 22, a first power supply circuit; 23, a first self-locking circuit; 24, a meter control unit; 31, a second power supply circuit; 32, a second self-locking circuit; 33, an electric power assisting control unit; 311, a filtering unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Before explaining the present disclosure in detail, an application scenario of the present disclosure will be described.
In recent years, the electric power-assisted bicycle is gradually developed, and in order to get through an international channel, the technical standard of the electric power-assisted bicycle needs to be continuously improved to reach the international common standard, so that the electric power-assisted bicycle is safe and reliable to use.
Based on the power supply circuit, the power supply circuit of the electric power-assisted bicycle is provided, so that the electric power-assisted bicycle can firstly supply power to the controller and then supply power to the instrument after the switch key is pressed, the controller of the electric power-assisted bicycle can control the whole power supply process of the electric power-assisted bicycle, and the electric power-assisted bicycle is safer and more reliable.
The following is an explanation by way of various embodiments in conjunction with the accompanying drawings. Fig. 1 is a schematic structural diagram of a power supply circuit of an electric power assisted bicycle according to the present invention, as shown in fig. 1, the electric power assisted bicycle includes: the method comprises the following steps: battery 1, instrument 2, controller 3.
The battery 1 is used for supplying power to the electric power-assisted bicycle, and may have a battery structure such as a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery, and the like, and the rated output voltage of the battery 1 may be a voltage value such as 24V, 36V, 48V, 60V, and the like, which is not limited in the present invention. The meter 2 is used for displaying information to a user, the user can check vehicle information such as the remaining power, the speed and the mileage of the electric power-assisted bicycle at the meter 2, and related functions of the vehicle, such as a power saving mode and an anti-lost mode, can also be set through the meter 2, which is not limited in the utility model. Meanwhile, in a possible implementation manner, the meter 2 may be an intelligent meter, and may be connected to a communication device such as a mobile phone through bluetooth, and a user may directly view the relevant information of the vehicle on the mobile phone in real time. In another possible implementation manner, a user can directly select the power supply proportion of the electric power and the manpower of the electric power-assisted bicycle on the instrument, so that the user can select the most comfortable riding manner according to the requirement. The controller 3 is used for controlling the running of the electric power-assisted bicycle, and the running state is controlled by controlling the motor of the bicycle. In a possible implementation manner, the controller 3 is further provided with a fault judging unit, and when a fault occurs, the controller 3 can directly control the operation of the motor according to the fault and transmit information to the meter 2 for displaying.
Specifically, the meter 2 includes: the device comprises a switch key circuit 21, a first power supply circuit 22, a first self-locking circuit 23 and an instrument control unit 24; the controller 3 includes a second power supply circuit 31, a second self-locking circuit 32, and an electric power assisting control unit 33.
The battery 1 is electrically connected with the input ends of the first power supply circuit 22 and the second power supply circuit 31 respectively; the output end of the first power supply circuit 22 and the first output end of the second power supply circuit 31 are electrically connected to the power supply ends of the instrument control unit 24 and the electric power assisting control unit 33, respectively;
the switch key circuit 21 is electrically connected to the control end of the second power supply circuit 31, so that when the switch key circuit 21 receives an input pressing operation, the second power supply circuit 31 is controlled to power on the electric power assisting control unit 33; a first output end of the electric power assisting control unit 33 is electrically connected with the second self-locking circuit 32, the second self-locking circuit 32 is electrically connected with a control end of the second power supply circuit 31, so that when the switch key circuit 21 receives a releasing operation, the second power supply circuit 31 is controlled to continuously supply power to the electric power assisting control unit 33;
the second output end of the electric power assisting control unit 33 is further electrically connected with the first self-locking circuit 23, and the first self-locking circuit 23 is electrically connected with the control end of the first power supply circuit 22 to control the first power supply circuit 22 to supply power to the instrument control unit 24.
The switch key circuit 21 is used for responding to the switch operation of a user, and when the user executes the power-on starting operation, the switch key circuit 21 is switched on; when the user performs the operation of turning off the power supply, the switch key circuit 21 is turned off; the first power supply circuit 22 is used for supplying power to the instrument control unit 24; the first self-locking circuit 23 keeps the meter 2 continuously powered on; the instrument control unit 24 plays a role in controlling the instrument 2, and in a possible implementation manner, on-off of an internal circuit of the instrument 2 can be controlled through the instrument control unit 24; the second power supply circuit 31 is used to supply power to the electric power assist control unit 33; the second self-locking circuit 32 is used for keeping the controller 3 continuously powered; the electric power assist control unit 33 functions to control the controller 3 so that the controller 3 functions to control the electric power assisted bicycle. Optionally, a circuit structure such as an overcurrent protection circuit, a motor driving circuit, etc. may be further disposed in the controller 3, which is not limited in the present invention. Meanwhile, the electric power assisting control unit 33 can also control the on/off of the first self-locking circuit 23 and the second self-locking circuit 32 by sending self-locking signals.
In an alternative embodiment, the meter control unit 24 is communicatively connected to the third output terminal of the electric power assisting control unit 33, for example, through a CAN communication mode, the meter control unit 24 and the electric power assisting control unit 33 perform data transmission through a CAN signal, for example, the electric power assisting control unit 33 transmits the current running speed of the electric power assisting bicycle, whether the vehicle has a fault, and other relevant parameters to the meter control unit 24, so as to facilitate parameter display of the meter 2.
Specifically, when the meter 2 and the controller 3 are in a power-off state, after a user presses a switch, that is, the switch key circuit 21 is switched on, the battery 1, the switch key circuit 21 and the second power supply circuit 31 form a path, the battery 1 can supply power to the electric power assisting control unit 33 in the controller 3 through the second power supply circuit 31, and after the electric power assisting control unit 33 works, a self-locking signal, such as a continuous high-level signal, is sent to the second self-locking circuit 32, so that a path is formed among the battery 1, the second self-locking circuit 32 and the second power supply circuit 31; when the user releases the switch, i.e. the switch key circuit 21 is disconnected, the battery 1, the second self-locking circuit 32 and the second power supply circuit 31 can still form a path, so that the second power supply circuit 31 continuously supplies power to the electric power assisting control unit 33. At this time, the electric power assisting control unit 33 sends a self-locking signal, such as a continuous high-level signal, to the first self-locking circuit 23, so that a path is formed among the battery 1, the first self-locking circuit 23, and the first power supply circuit 22, and the battery 1 supplies power to the meter control unit 24 through the first power supply circuit 22, so that the battery 1 supplies power to the controller 3 first and then supplies power to the meter 2 after the switch of the electric power assisting bicycle is pressed.
In this embodiment, when the key circuit is switched on and off, the battery first supplies power to the second power supply circuit in the controller, so that the second power supply circuit supplies power to the electric power assisting control unit; after the switch button circuit opens circuit, the second supply circuit still can last to the power supply of electric power assisted control unit, simultaneously after the controller normally works, the battery supplies power to the instrument control unit through first supply circuit, reach the power supply purpose of supplying power to the controller earlier and then supplying power to the instrument behind the switch button circuit, make the controller can be at the power-on process of other subassemblies of power assisted bicycle of control, let the power-on process of electric power assisted bicycle more safe and reliable, guarantee electric power assisted bicycle's stability.
On the basis of the structural schematic diagram of the power supply circuit of the electric power-assisted bicycle provided by the above fig. 1, the utility model also provides a possible implementation manner of the switch key circuit. Fig. 2 is a schematic structural diagram of a switch key circuit provided in the present invention. As shown in fig. 2, the switch key circuit 21 includes: the circuit comprises a key switch, a first resistor R1 and a first diode D1; one end of the key switch is grounded through a first resistor R1, the other end of the key switch is electrically connected with the cathode of the first diode D1, and the anode of the first diode D1 is electrically connected with the control end of the second power supply circuit 31.
The first resistor R1 is mainly designed to be a ground resistor, so as to play a role in lightning protection and static electricity prevention, and the resistance value can be set according to actual requirements, which is not limited by the present invention.
In this embodiment, by setting the switch key circuit, the user can timely respond the operation to the relevant component through the circuit when performing the switch operation.
On the basis of the structure diagram of the power supply circuit of the electric power assisted bicycle provided in fig. 1, the present embodiment also provides a possible implementation manner of the second power supply circuit. Fig. 3 is a schematic structural diagram of a second power supply circuit provided in the present invention, and as shown in fig. 3, the second power supply circuit 31 includes a second resistor R2, a filter unit 311, a first switch tube Q1, and a first dc voltage reducer; one end of the second resistor R2 is a control end of the second power supply circuit 31, the other end of the second resistor R2 is electrically connected to a control end of the first switch tube, a power end of the first switch tube Q1 is electrically connected to the battery 1, a filter unit 311 is electrically connected between the power end of the first switch tube Q1 and the control end of the first switch tube Q1, an output end of the first switch tube Q1 is electrically connected to an input end of the first dc voltage reducer, and an output end of the first dc voltage reducer is a first output end of the second power supply circuit 31.
In the above example, the first switch Q1 may be any switch such as a field effect transistor, a triode, an insulated gate bipolar transistor, etc., and the present invention is not limited thereto. In a possible implementation manner, the first switching tube Q1 is a PNP triode, the control terminal of the first switching tube Q1 is a base, the power source terminal of the first switching tube Q1 is an emitter, and the output terminal of the first switching tube Q1 is a collector. The filtering unit 311 may be composed of a resistor R3 and a capacitor C1 connected in parallel; the first dc-dropper functions to drop the voltage of the battery 1(VCC) to the rated voltage of the electric power assist control unit 33, such as 5V.
Specifically, when the meter 2 and the controller 3 are in a power-off state, after a user presses a switch, that is, the switch key circuit 21 is switched on, the battery 1, the switch key circuit 21 and the second power supply circuit 31 form a circuit, at this time, the second resistor R2 and the resistor R3 may form a voltage dividing circuit, so that the voltage applied to the emitter of the first switch tube Q1 is higher than the voltage applied to the base of the first switch tube Q1, the conduction condition of the PNP tube is met, and the first switch tube Q1 is conducted; meanwhile, the battery 1 may be directly loaded to the collector of the first switching tube Q1 and may reduce the voltage to the rated voltage of the electric power assisting control unit 33 through the first dc voltage reducer for transmission, so that the second power supply circuit 31 supplies power to the electric power assisting control unit 33.
In the embodiment, the switching tube, the resistor, the filter unit, the voltage-dividing circuit and the direct-current voltage reducer are used to form the power supply circuit of the controller, so that the power supply circuit can output corresponding power supply voltage to the electric power assisting control unit according to the requirement.
Meanwhile, on the basis of the second power supply circuit provided in fig. 3, the present embodiment also provides another possible implementation manner of the second power supply circuit. Fig. 4 is a schematic structural diagram of another second power supply circuit provided in the present invention, and as shown in fig. 4, the second power supply circuit 31 further includes: the positive electrode of the second diode D2 is electrically connected with the output end of the first switch tube Q1, the negative electrode of the second diode D2 is electrically connected with one end of the magnetic bead, the other end of the magnetic bead is a second output end of the second power supply circuit 31, and the second output end of the second power supply circuit 31 is used for electrically connecting power ends of other power utilization units in the electric power assisted bicycle.
Alternatively, the electric power assisted bicycle further has an electricity utilization unit such as a motor drive circuit, a sensor circuit, a detection circuit, etc., which can be connected through the second output terminal so that the second power supply circuit 31 supplies power. In a possible implementation manner, the cathode of the second diode D2 may also be directly used as the second output terminal of the second power supply circuit 31 without the series connection of the magnetic bead FB1, which is not limited in the present invention.
In this embodiment, the magnetic beads are connected in series behind the second diode, so that the problems of peak inversion voltage and radiation of the diode are controlled, and meanwhile, the diode is continuously connected in parallel at the output end of the first switch tube to serve as an output path, so that the second power supply circuit can supply power to other power utilization units.
On the basis of the structural schematic diagram of the power supply circuit of the electric power assisted bicycle provided in fig. 1, the present embodiment further provides a possible implementation manner of the second self-locking circuit. Fig. 5 is a schematic structural diagram of a second self-locking circuit provided by the present invention, and as shown in fig. 5, the second self-locking circuit 32 includes a fourth resistor R4, a fifth resistor R5, and a second switching tube Q2; a first output end of the electric power assisting control unit 33 is electrically connected with a control end of the second switch tube Q2 through a fourth resistor R4; the power end of the second switching tube Q2 is grounded, a fifth resistor R5 is electrically connected between the power end and the control end of the second switching tube Q2, and the output end of the second switching tube Q2 is electrically connected to the control end of the second power supply circuit 31.
In the above example, the second switch Q2 may be any switch such as a field effect transistor, a triode, an insulated gate bipolar transistor, etc., and the present invention is not limited thereto. In a possible implementation manner, the second switching transistor Q2 is an NPN transistor, the control terminal of the second switching transistor Q2 is a base, the power source terminal of the second switching transistor Q2 is an emitter, and the output terminal of the second switching transistor Q2 is a collector.
The fourth resistor R4 is a resistor connected in series with the base of the second switch transistor Q2, and is a current-limiting resistor to prevent the switch transistor from being damaged due to the excess base current caused by the too high amplitude of the input voltage; the fifth resistor R5 is used to connect the drain current of the second switch transistor Q2 to ground, so that the second switch transistor Q2 is stable and reliable when no voltage is input to the second switch transistor Q2. Specifically, the magnitude of the fifth resistor R5 can be selected according to the magnitude of the leakage current of the second switch transistor Q2, and the resistance of the leakage current is small when the leakage current is large.
Specifically, after the electric power assisting control unit 33 supplies power, the first output end of the electric power assisting control unit 33 sends a self-locking signal to the second self-locking circuit 32 to one end of the fourth resistor R4 of the second self-locking circuit 32, for example, a signal with a continuous high level passes through the fourth resistor R4 and the fifth resistor R5, so that the voltage of the base electrode loaded to the second switch tube Q2 is higher than the voltage of the emitter electrode of the second switch tube Q2, the conduction condition of the NPN transistor is met, the second switch tube Q2 is conducted, and the connection between the output end of the second self-locking circuit 32 and the control end of the second power supply circuit 31 is conducted.
In this embodiment, the second power supply circuit can continuously supply power to the electric power assisting control unit in the controller by providing the second self-locking circuit so that a path is formed among the second power supply circuit, the second self-locking circuit and the battery after the switch is released.
On the basis of the structure diagram of the power supply circuit of the electric power assisted bicycle provided in fig. 1, the present embodiment further provides a possible implementation manner of the first power supply circuit. Fig. 6 is a schematic structural diagram of a first power supply circuit provided by the present invention, and as shown in fig. 6, the first power supply circuit 22 includes a sixth resistor R6, a seventh resistor R7, a third switching tube Q3, and a second dc voltage reducer; the sixth resistor R6 is electrically connected between the control end of the third switching tube Q3 and the first self-locking circuit 23, the power end of the third switching tube Q3 is electrically connected to the battery 1, the battery 1 is also electrically connected to the control end of the third switching tube Q3 through the seventh resistor R7, the output end of the third switching tube Q3 is electrically connected to the input end of the second dc step-down transformer, and the output end of the second dc step-down transformer is the output end of the first power supply circuit 22.
In the above example, the third switch Q3 may be any switch such as a field effect transistor, a triode, an insulated gate bipolar transistor, etc., and the present invention is not limited thereto. In a possible implementation manner, the third switching tube Q3 is a PNP triode, the control terminal of the third switching tube Q3 is a base, the power source terminal of the first switching tube is an emitter, and the output terminal of the third switching tube Q3 is a collector. Optionally, the seventh resistor R7 may also be connected in parallel with a capacitor to form a filtering unit. The second dc dropper functions to drop the voltage of the battery 1(VCC) to the rated voltage of the meter control unit 24, such as 5V.
Specifically, the battery 1 may form a voltage divider circuit through the sixth resistor R6 and the seventh resistor R7, so that the voltage applied to the emitter of the third switching tube Q3 is higher than the voltage applied to the base of the third switching tube Q3, and the conduction condition of the PNP transistor is satisfied, so that the third switching tube Q3 is turned on; meanwhile, the battery 1 may be directly loaded to the collector of the third switching tube Q1 and the voltage may be dropped to the rated voltage of the meter control unit 24 through the second dc dropper for transmission, so that the first power supply circuit 22 supplies power to the meter control unit 24.
In this embodiment, the voltage dividing circuit formed by the switching tube and the resistor and the dc voltage reducer are used to form the power supply circuit of the controller, so that the power supply circuit can output corresponding power supply voltage to the instrument control unit according to the requirement.
On the basis of the structural schematic diagram of the power supply circuit of the electric power assisted bicycle provided in fig. 1, the present embodiment further provides a possible implementation manner of the first self-locking circuit. Fig. 7 is a schematic structural diagram of a first self-locking circuit provided by the present invention, and as shown in fig. 7, the first self-locking circuit 23 includes an eighth resistor R8, a ninth resistor R9, and a fourth switch tube Q4; the input end of the fourth switching tube Q4 is grounded, the control end of the fourth switching tube Q4 is electrically connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is electrically connected to the second output end of the electric power assisting control unit 33; a ninth resistor R9 is electrically connected between the control end and the input end of the fourth switching tube Q4, and the output end of the fourth switching tube Q4 is electrically connected to the control end of the first power supply circuit 22.
In the above example, the fourth switching transistor Q4 may be any switching transistor, such as a field effect transistor, a triode, an insulated gate bipolar transistor, etc., and the present invention is not limited thereto. In a possible implementation manner, the fourth switching transistor Q4 is an NPN triode, the control terminal of the fourth switching transistor Q4 is a base, the power source terminal of the fourth switching transistor Q4 is an emitter, and the output terminal of the fourth switching transistor Q4 is a collector.
The eighth resistor R8 is used as a resistor connected in series with the base of the fourth switching tube Q4 and is a current-limiting resistor, so that the switching tube is prevented from being damaged due to the fact that base current is excessive due to the fact that the amplitude of input voltage is too high; the ninth resistor R9 is used to connect the drain current of the fourth switching transistor Q4 to ground, so that the fourth switching transistor Q4 is stable and reliable when no voltage is input to the fourth switching transistor Q4. Specifically, the size of the ninth resistor R9 can be selected according to the size of the leakage current of the fourth switch Q4, and the resistance of the leakage current is small when the leakage current is large, and the specific resistance is not limited in this embodiment.
Specifically, when the user releases the switch, i.e., the switch key circuit 21 is disconnected, the battery 1, the second self-locking circuit 32, and the second power supply circuit 31 can still form a path, so that the second power supply circuit 31 continuously supplies power to the electric power assisting control unit 33. At this time, the second output end of the electric power assisting control unit 33 sends a self-locking signal to the first self-locking circuit 23 to one end of an eighth resistor R8 of the first self-locking circuit 23, and if a signal with a continuous high level passes through the eighth resistor R8 and the ninth resistor R9, the base voltage loaded to the fourth switching tube Q4 is higher than the emitter voltage of the fourth switching tube Q4, so as to satisfy the conduction condition of the NPN tube, so that the fourth switching tube Q4 is conducted, and the connection between the output end of the first self-locking circuit 23 and the control end of the first power supply circuit 22 is conducted.
In this embodiment, by providing the first self-locking circuit, when the switch is released, a path is formed among the first power supply circuit, the first self-locking circuit and the battery, and the first power supply circuit can continuously supply power to the meter control unit in the meter.
In order to more clearly illustrate the power supply process of the power supply circuit of the electric power assisted bicycle, the present embodiment further provides a schematic structural diagram of the power supply circuit of the electric power assisted bicycle on the basis of the above embodiments.
Fig. 8 is a schematic structural diagram of another power supply circuit of an electric power assisted bicycle according to the present invention, as shown in fig. 8, wherein the specific connection relationship between the components is not repeated herein.
Specifically, when the meter 2 and the controller 3 are in a power-off state, after a user presses a switch, that is, the switch key circuit 21 is switched on, the battery 1, the switch key circuit 21 and the second power supply circuit 31 form a circuit, at this time, the second resistor R2 and the resistor R3 may form a voltage dividing circuit, so that the voltage applied to the emitter of the first switch tube Q1 is higher than the voltage applied to the base of the first switch tube Q1, the conduction condition of the PNP tube is met, and the first switch tube Q1 is conducted; meanwhile, the battery 1 may be directly loaded to the collector of the first switching tube Q1 and may reduce the voltage to the rated voltage of the electric power assisting control unit 33 through the first dc voltage reducer for transmission, so that the second power supply circuit 31 supplies power to the electric power assisting control unit 33. After the electric power assisting control unit 33 supplies power, the first output end of the electric power assisting control unit 33 sends a self-locking signal to the second self-locking circuit 32 to one end of the fourth resistor R4 of the second self-locking circuit 32, and after passing through the fourth resistor R4 and the fifth resistor R5, the base voltage loaded to the second switching tube Q2 is higher than the emitter voltage of the second switching tube Q2, so as to satisfy the conduction condition of the NPN transistor, and the second switching tube Q2 is turned on, so that the connection between the output end of the second self-locking circuit 32 and the control end of the second power supply circuit 31 is turned on, that is, at this time, a path is formed among the battery 1, the third resistor R3, the second resistor R2, and the second switching tube Q2, that is, the battery 1, the second power supply circuit 31, and the second self-locking circuit 32 form a path.
When the user releases the switch, i.e. the switch key circuit 21 is disconnected, the battery 1, the second power supply circuit 31 and the second self-locking circuit 32 can still form a path, so that the second power supply circuit 31 continuously supplies power to the electric power assisting control unit 33. At this time, the second output end of the electric power assisting control unit 33 sends a self-locking signal to the first self-locking circuit 23 to one end of an eighth resistor R8 of the first self-locking circuit 23, and if a signal with a continuous high level passes through the eighth resistor R8 and the ninth resistor R9, the base voltage loaded to the fourth switch tube Q4 is higher than the emitter voltage of the fourth switch tube Q4, so that the conduction condition of the NPN transistor is satisfied, the fourth switch tube Q4 is turned on, and the connection between the output end of the first self-locking circuit 23 and the control end of the first power supply circuit 22 is turned on, that is, at this time, the battery 1, the seventh resistor R7, the sixth resistor R6, and the fourth switch tube Q4 form a path; the battery 1 can form a voltage divider circuit through the sixth resistor R6 and the seventh resistor R7, so that the voltage applied to the emitter of the third switching tube Q3 is higher than the voltage applied to the base of the third switching tube Q3, and the conduction condition of the PNP transistor is satisfied, so that the third switching tube Q3 is conducted; meanwhile, the battery 1 may be directly loaded to the collector of the third switching tube Q1 and the voltage may be dropped to the rated voltage of the meter control unit 24 through the second dc dropper for transmission, so that the first power supply circuit 22 supplies power to the meter control unit 24.
Through using above-mentioned utility model example, can carry out the in-process of supplying power at electric power assisted bicycle, let the battery supply power to the controller earlier, supply power to other power consumption circuits such as instrument again for all power supply processes of electric power assisted bicycle can be participated in to the controller, have not only improved electric power assisted bicycle's fail safe nature, and the electric power assisted bicycle of also being convenient for carries out troubleshooting.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention to the 5-type, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power supply circuit for an electrically assisted bicycle, comprising: batteries, meters, controllers; the meter includes: the device comprises a switch key circuit, a first power supply circuit, a first self-locking circuit and an instrument control unit; the controller comprises a second power supply circuit, a second self-locking circuit and an electric power assisting control unit;
the battery is respectively and electrically connected with the input ends of the first power supply circuit and the second power supply circuit; the output end of the first power supply circuit and the first output end of the second power supply circuit are respectively and electrically connected with the power supply ends of the instrument control unit and the electric power assisting control unit;
the switch key circuit is electrically connected with the control end of the second power supply circuit so as to control the second power supply circuit to power on the electric power assisting control unit when the switch key circuit receives input pressing operation; the first output end of the electric power assisting control unit is electrically connected with the second self-locking circuit, the second self-locking circuit is electrically connected with the control end of the second power supply circuit, and therefore when the switch key circuit receives a releasing operation, the second power supply circuit is controlled to continuously supply power to the electric power assisting control unit;
the second output end of the electric power assisting control unit is also electrically connected with the first self-locking circuit, and the first self-locking circuit is electrically connected with the control end of the first power supply circuit so as to control the first power supply circuit to supply power to the instrument control unit.
2. The power supply circuit for an electric power-assisted bicycle according to claim 1, wherein the switch button circuit includes: the key switch, the first resistor and the first diode;
one end of the key switch is grounded through the first resistor, the other end of the key switch is electrically connected with the cathode of the first diode, and the anode of the first diode is electrically connected with the control end of the second power supply circuit.
3. The power supply circuit for an electric power-assisted bicycle according to claim 1, wherein the second power supply circuit comprises a second resistor, a filter unit, a first switching tube, a first dc-step-down transformer; one end of the second resistor is a control end of the second power supply circuit, the other end of the second resistor is electrically connected with a control end of the first switch tube, a power end of the first switch tube is electrically connected with the battery, a filtering unit is electrically connected between the power end of the first switch tube and the control end of the first switch tube, an output end of the first switch tube is electrically connected with an input end of the first direct current step-down transformer, and an output end of the first direct current step-down transformer is a first output end of the second power supply circuit.
4. The power supply circuit for an electric power-assisted bicycle according to claim 3, wherein the second power supply circuit further comprises: the anode of the second diode is electrically connected with the output end of the first switch tube, the cathode of the second diode is electrically connected with one end of the magnetic bead, the other end of the magnetic bead is the second output end of the second power supply circuit, and the second output end of the second power supply circuit is electrically connected with the power ends of other power utilization units in the electric power-assisted bicycle.
5. The power supply circuit of an electric bicycle according to claim 3, wherein the first switch tube is a PNP triode, and then the control terminal of the first switch tube is a base, the power supply terminal of the first switch tube is an emitter, and the output terminal of the first switch tube is a collector.
6. The power supply circuit of the electric power assisted bicycle according to claim 1, wherein the second self-locking circuit comprises a fourth resistor, a fifth resistor and a second switch tube; a first output end of the electric power assisting control unit is electrically connected with a control end of the second switching tube through the fourth resistor; the power end of the second switching tube is grounded, the fifth resistor is electrically connected between the power end and the control end of the second switching tube, and the output end of the second switching tube is electrically connected with the control end of the second power supply circuit.
7. The power supply circuit of an electric bicycle according to claim 6, wherein the second switch tube is an NPN transistor, the control terminal of the second switch tube is a base, the power supply terminal of the second switch tube is an emitter, and the output terminal of the second switch tube is a collector.
8. The power supply circuit for an electric power assisted bicycle according to claim 1, wherein the first power supply circuit comprises a sixth resistor, a seventh resistor, a third switching tube, a second direct current step-down transformer; the sixth resistor is electrically connected between the control end of the third switching tube and the first self-locking circuit, the power end of the third switching tube is electrically connected with the battery, the battery is also electrically connected with the control end of the third switching tube through the seventh resistor, the output end of the third switching tube is electrically connected with the input end of the second direct current voltage reducer, and the output end of the second direct current voltage reducer is the output end of the first power supply circuit.
9. The power supply circuit of an electric power assisted bicycle according to claim 1, wherein the first self-locking circuit comprises an eighth resistor, a ninth resistor and a fourth switching tube; the input end of the fourth switching tube is grounded, the control end of the fourth switching tube is electrically connected with one end of the eighth resistor, and the other end of the eighth resistor is electrically connected with the second output end of the electric power assisting control unit; and a ninth resistor is electrically connected between the control end and the input end of the fourth switch tube, and the output end of the fourth switch tube is electrically connected with the control end of the first power supply circuit.
10. The power supply circuit for an electric power assisted bicycle according to claim 1, wherein the meter control unit is communicatively connected to the third output of the electric power assisted control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220552008.9U CN216783708U (en) | 2022-03-14 | 2022-03-14 | Power supply circuit of electric power-assisted bicycle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220552008.9U CN216783708U (en) | 2022-03-14 | 2022-03-14 | Power supply circuit of electric power-assisted bicycle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071868A (en) * | 2022-07-21 | 2022-09-20 | 广东高标电子科技有限公司 | Electric power-assisted vehicle and control system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115071868A (en) * | 2022-07-21 | 2022-09-20 | 广东高标电子科技有限公司 | Electric power-assisted vehicle and control system thereof |
| CN115071868B (en) * | 2022-07-21 | 2023-10-03 | 广东高标电子科技有限公司 | Electric power-assisted vehicle and control system thereof |
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