CN116742759A - Power supply control circuit and electrical equipment - Google Patents
Power supply control circuit and electrical equipment Download PDFInfo
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Abstract
The invention relates to the technical field of power electronics, and discloses a power supply control circuit and electrical equipment, wherein the circuit comprises: the circuit comprises a first switch circuit, a voltage division circuit, a second switch circuit and a comparison circuit; the voltage input end of the voltage dividing circuit is connected with a chargeable power supply; the first end of the first switch circuit is connected with a chargeable power supply, the second end of the first switch circuit is connected with a power supply interface of a power supply object, and the control end of the first switch circuit is connected with a voltage output end of the voltage dividing circuit; the first end of the second switch circuit is connected with the chargeable power supply, the second end of the second switch circuit is connected with the voltage output end of the voltage dividing circuit, the first control end receives a standby control signal of a power supply object, and the second control end is connected with the output end of the comparison circuit; the first input end of the comparison circuit is connected with the chargeable power supply, the second input end of the comparison circuit is connected with the power supply interface of the power supply object, the power supply control between the chargeable power supply and the power supply object is realized in a hardware circuit signal self-driving mode, an external control signal and a controller are not required to be added, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply control circuit and electrical equipment.
Background
At present, portable electronic devices, such as portable electric fans, are increasingly increased, and the portable electronic devices are generally limited by the product size, so that the size and the capacity of a built-in battery are not too large, and at this time, not only the running time of the device which can be maintained by the battery during normal operation, but also the battery endurance time in the standby state of the device needs to be synchronously considered, so that the problems that frequent charging is required under the condition that a user is not in use, and the battery is damaged due to overdischarge under the condition that the user is not in charge are avoided.
In order to extend the standby duration of the battery, two methods are generally adopted in the related art: firstly, the battery capacity is increased, and the endurance time is increased; and secondly, a switch is added, so that the power supply of a battery is cut off when the equipment is not used, the output of the battery is reduced, and the loss is reduced. Aiming at the two schemes, the battery capacity is increased, the size is increased, the assembly of the whole machine is not facilitated, and the design requirement of portable miniaturization of equipment cannot be met. However, the method of adding the switch can cut off the battery power supply when the equipment is not used, so that the standby duration of the battery is prolonged, but how to ensure the normal charging of the battery while cutting off the battery power supply is a new technical problem.
In the related art, the main control chip is used for controlling the power-off endurance and normal charging of the battery in a mode of adding external control signals through software processing, and the existing controller circuit of the product needs to be changed, so that the production cost is increased.
Disclosure of Invention
In view of the above, the invention provides a power supply control circuit and an electrical device, so as to solve the problem that the switching control of the power-off endurance and the normal charging of the electrical device in the related art needs to be realized by depending on an external control signal of a main control chip, and the production cost is high.
In a first aspect, the present invention provides a power supply control circuit comprising: the circuit comprises a first switch circuit, a voltage division circuit, a second switch circuit and a comparison circuit;
the voltage input end of the voltage dividing circuit is connected with a chargeable power supply;
the first end of the first switch circuit is connected with the chargeable power supply, the second end of the first switch circuit is connected with a power supply interface of a power supply object, the control end of the first switch circuit is connected with the voltage output end of the voltage dividing circuit, and the first end and the second end of the first switch circuit have conduction voltage drops when being conducted;
the first end of the second switch circuit is connected with the chargeable power supply, the second end of the second switch circuit is connected with the voltage output end of the voltage dividing circuit, the first control end receives the standby control signal of the power supply object, and the second control end is connected with the output end of the comparison circuit;
the first input end of the comparison circuit is connected with the chargeable power supply, the second input end of the comparison circuit is connected with a power supply interface of the power supply object, and the comparison circuit outputs a driving signal when the power supply interface of the power supply object is connected with external charging voltage, and the charging voltage of the chargeable power supply is larger than the power supply voltage of the chargeable power supply;
the second switch circuit is turned on when the standby control signal is received and the comparison circuit does not output a driving signal, and turned off when the standby control signal is not received or the comparison circuit outputs a driving signal.
Therefore, the first switch circuit is arranged to realize the power supply and charging of the internal chargeable power supply when the power supply object normally works, the second switch circuit is controlled to be conducted by utilizing the standby control signal triggered by the standby of the power supply object so as to control the first switch circuit to be turned off, the automatic power-off function of the chargeable power supply in the standby is realized, the cruising ability of the chargeable power supply is prolonged, the waste of electric quantity is avoided, meanwhile, when the external power supply is connected to the power supply object, the drive comparison circuit works to output the drive signal to control the second switch circuit to be turned off, the first switch circuit is further controlled to recover the conducting state, the function of charging the chargeable power supply in the standby condition is realized, after the external power supply is withdrawn, the drive comparison circuit is stopped to output the drive signal by utilizing the conducting voltage drop of the first switch circuit, and the state of automatic power-off of the chargeable power supply in the standby can be recovered. The power supply control circuit provided by the embodiment of the invention realizes the power supply control between the chargeable power supply and the power supply object in a self-driven manner of the hardware circuit signal, does not need to add an external control signal and a controller, does not need to change the existing controller circuit, only needs to arrange the power supply control circuit between the chargeable power supply and the power supply object, and greatly reduces the production cost.
In an alternative embodiment, the first switching circuit includes: the controlled switch is a P-type field effect transistor, the source electrode of the P-type field effect transistor is connected with the chargeable power supply, the drain electrode of the P-type field effect transistor is connected with a power supply interface of a power supply object, and the grid electrode of the P-type field effect transistor is connected with the voltage output end of the voltage dividing circuit.
By utilizing the principle that the self impedance of the P-type field effect transistor generates voltage drop when the P-type field effect transistor is conducted, the comparison circuit is driven to work, the automatic switching function of charging and power-off endurance of the chargeable power supply in a standby mode is realized, only one switching device of the P-type field effect transistor is needed, the circuit structure is simpler, and the production cost is further reduced.
In an alternative embodiment, the second switching circuit includes: a first controlled switch and a second controlled switch;
the first end of the first controlled switch is connected with the chargeable power supply, the second end of the first controlled switch is connected with the first end of the second controlled switch, the control end receives a standby control signal of the power supply object, and the first controlled switch controls the first end and the second end of the first controlled switch to be connected when receiving the standby control signal of the power supply object;
the second end of the second controlled switch is connected with the voltage output end of the voltage dividing circuit, the control end of the second controlled switch is connected with the output end of the comparison circuit, and the second controlled switch is turned off when receiving the driving signal output by the comparison circuit.
The mode of jointly conducting circuit on-off control by utilizing the two controlled switches is adopted, one controlled switch is conducted after the power supply object is in standby, and the other controlled switch is conducted when the power supply object is externally powered, so that the automatic switching control of standby endurance and automatic charging of the chargeable power supply is realized by utilizing only the two controlled switches, the circuit structure is simple, and the production cost is further reduced.
In an alternative embodiment, the first controlled switch is a mechanical switch, and the mechanical switch is disposed on the power supply object, and the mechanical switch is triggered to be turned on when the power supply object performs a standby action.
Therefore, the mechanical switch is automatically triggered to be conducted through the standby action of the power supply object by utilizing the characteristics of firmness, durability and low cost of the mechanical switch, and in addition, the mechanical switch action can be manually operated according to the actual requirement of a product, so that the product can be conveniently controlled to be invalid in the automatic standby mode or according to the endurance requirement of an actual power supply, the power supply can be manually controlled to be powered off, and the flexibility of the power supply power-off control is improved.
In an alternative embodiment, the mechanical switch is a microswitch.
Due to the characteristics of compact structure, convenient installation and arrangement, reliable action and long service life of the micro switch, the micro switch is used as a standby trigger switch, so that the micro switch is beneficial to realizing the miniaturization design of products and guaranteeing the stability of the products.
In an alternative embodiment, the second controlled switch is a PNP transistor.
By utilizing the characteristics of small size, light weight, low power consumption and low price of the PNP triode, the production cost can be reduced, and the power consumption of a circuit can be reduced.
In an alternative embodiment, the second switching circuit further comprises: and one end of the first resistor is connected with the control end of the second controlled switch, and the other end of the first resistor is grounded.
The first resistor is arranged to filter the circuit, so that misoperation caused by the influence of noise signals on the second controlled switch is prevented, and the stability of circuit control is ensured.
In an alternative embodiment, the comparison circuit includes: and the reverse input end of the comparator is connected with the chargeable power supply, the forward input end of the comparator is connected with the power supply interface of the power supply object, and the output end of the comparator is connected with the second control end of the second switch circuit.
The comparator is arranged to realize the signal comparison function, so that the cost is low, the reliability is high, and the control of the product cost is facilitated.
In an alternative embodiment, the power supply control circuit further includes: a first connection terminal and a second connection terminal,
the power supply control circuit is connected with the chargeable power supply through the first wiring terminal;
the power supply control circuit is connected with a power supply interface of the power supply object through the second connecting terminal.
The connection of the power supply control circuit, the chargeable power supply and the power supply object is facilitated by the arrangement of the wiring terminal, and the installation and the maintenance are facilitated.
In an alternative embodiment, the rechargeable power source is a battery.
The battery is used for supplying power to the target object, so that the power supply cost is lower.
In a second aspect, the present invention also provides an electrical apparatus, including: a rechargeable power source, a power supply object and a power supply control circuit as provided in the first aspect and any optional embodiments thereof.
The electrical equipment provided by the embodiment of the invention realizes the power supply control between the chargeable power supply and the electrical equipment power supply object in a hardware circuit signal self-driving mode, does not need to add an external control signal and a controller, does not need to change the existing controller circuit, only needs to arrange the power supply control circuit between the chargeable power supply and the power supply object, and greatly reduces the production cost.
In an alternative embodiment, the electrical device is an electric fan, and the power supply object is an electric fan main board.
Therefore, the power supply control between the electric fan power supply and the electric fan main board is realized by utilizing the power supply control circuit, the automatic switching between the power off and the charging is realized while the power supply endurance life of the electric fan is prolonged, the production cost of the electric fan is reduced, and the use experience of a user is improved.
In an alternative embodiment, the electric fan is a foldable electric fan, and when the first controlled switch in the second switch circuit is a micro switch, the micro switch is arranged at a folding position of the foldable electric fan, and the micro switch is triggered to be turned on when the folding position is folded.
Therefore, the electric fan is in a non-working state when being folded, the folding state and the unfolding state of the folding structure of the complete machine can be adapted, the micro switch is automatically triggered to be closed and opened, and the use experience of a user is further improved without additional other operations.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed 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 present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional control circuit between a battery and a motherboard in the prior art;
fig. 2 is a schematic diagram of a power supply control circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an electrical apparatus according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, portable electronic devices, such as portable electric fans, are increasingly increased, and the portable electronic devices are generally limited by the product size, so that the size and the capacity of a built-in battery are not too large, and at this time, not only the running time of the device which can be maintained by the battery during normal operation, but also the battery endurance time in the standby state of the device needs to be synchronously considered, so that the problems that frequent charging is required under the condition that a user is not in use, and the battery is damaged due to overdischarge under the condition that the user is not in charge are avoided.
In order to extend the standby duration of the battery, two methods are generally adopted in the related art:
firstly, the battery capacity is increased, and the endurance time is increased;
and secondly, a switch is added, so that the power supply of a battery is cut off when the equipment is not used, the output of the battery is reduced, and the loss is reduced.
Aiming at the two schemes, the battery capacity is increased, the size is increased, the assembly of the whole machine is not facilitated, and the design requirement of portable miniaturization of equipment cannot be met. However, the method of adding the switch can cut off the battery power supply when the equipment is not used, so that the standby duration of the battery is prolonged, but how to ensure the normal charging of the battery while cutting off the battery power supply is a new technical problem.
As shown in fig. 1, a control switch KEY1 is disposed between a connection terminal CN3 of the battery and a connection terminal CN4 of the main board, and after the main board is standby, the battery is cut off to supply power to the main board, and when the control switch KEY1 is turned off, the battery life can be prolonged, the battery loss can be reduced, but the battery cannot realize the charging function at this time.
Based on the above-mentioned problems, an embodiment of the present invention provides a power supply control circuit, as shown in fig. 2, including: a first switch circuit 101, a voltage dividing circuit 102, a second switch circuit 103, and a comparison circuit 104;
the voltage input end of the voltage dividing circuit 102 is connected with a chargeable power supply;
the first end of the first switch circuit 101 is connected with a chargeable power supply, the second end of the first switch circuit is connected with a power supply interface of a power supply object, the control end of the first switch circuit is connected with a voltage output end of the voltage dividing circuit 102, and a conduction voltage drop exists between the first end and the second end of the first switch circuit 101 when the first switch circuit is conducted;
the first end of the second switch circuit 103 is connected with the chargeable power supply, the second end is connected with the voltage output end of the voltage dividing circuit 102, the first control end receives a standby control signal of a power supply object, and the second control end is connected with the output end of the comparison circuit 104;
the first input end of the comparison circuit 104 is connected with a chargeable power supply, the second input end of the comparison circuit 104 is connected with a power supply interface of a power supply object, and when the power supply interface of the power supply object is connected with external charging voltage, the comparison circuit 104 outputs a driving signal, and the charging voltage of the chargeable power supply is larger than that of the chargeable power supply;
the second switch circuit 103 is turned on when the standby control signal is received and the comparison circuit 104 does not output the driving signal, and is turned off when the standby control signal is not received or the comparison circuit 104 outputs the driving signal.
Illustratively, the rechargeable power source is a battery. The battery is used for supplying power to the target object, so that the power supply cost is lower. The power supply object is a main board of the electrical equipment, taking the electrical equipment as an electric fan as an example, and the power supply object is the main board of the electric fan.
Therefore, the first switch circuit is arranged to realize the power supply and charging of the internal chargeable power supply when the power supply object normally works, the second switch circuit is controlled to be conducted by utilizing the standby control signal triggered by the standby of the power supply object so as to control the first switch circuit to be turned off, the automatic power-off function of the chargeable power supply in the standby is realized, the cruising ability of the chargeable power supply is prolonged, the waste of electric quantity is avoided, meanwhile, when the external power supply is connected to the power supply object, the drive comparison circuit works to output the drive signal to control the second switch circuit to be turned off, the first switch circuit is further controlled to recover the conducting state, the function of charging the chargeable power supply in the standby condition is realized, after the external power supply is withdrawn, the drive comparison circuit is stopped to output the drive signal by utilizing the conducting voltage drop of the first switch circuit, and the state of automatic power-off of the chargeable power supply in the standby can be recovered. The power supply control circuit provided by the embodiment of the invention realizes the power supply control between the chargeable power supply and the power supply object in a self-driven manner of the hardware circuit signal, does not need to add an external control signal and a controller, does not need to change the existing controller circuit, only needs to arrange the power supply control circuit between the chargeable power supply and the power supply object, and greatly reduces the production cost.
In some alternative embodiments, the first switching circuit includes: as shown in fig. 2, the controlled switch is a P-type field effect transistor U1, the source of the P-type field effect transistor U1 is connected to the rechargeable power source, the drain is connected to the power supply interface of the power supply object, and the gate is connected to the voltage output end of the voltage dividing circuit 102.
By utilizing the principle that the self impedance of the P-type field effect transistor generates voltage drop when the P-type field effect transistor is conducted, the comparison circuit is driven to work, the automatic switching function of charging and power-off endurance of the chargeable power supply in a standby mode is realized, only one switching device of the P-type field effect transistor is needed, the circuit structure is simpler, and the production cost is further reduced. In addition, because the power supply control circuit is mainly applied to the power supply path, the related current is generally larger, the control effect of the field effect transistor is better, and the circuit structure is simple.
In practical application, the controlled switch may be a switch with a conducting voltage drop, such as an IGBT device, and a peripheral circuit thereof, and the model selection of the specific controlled switch and the design of the peripheral circuit may be flexibly set according to practical needs, so long as the power supply control of the rechargeable power supply and the power supply object can be realized.
In some alternative embodiments, as shown in fig. 2, the voltage dividing circuit 102 is formed by a second resistor R1 and a third resistor R3, where one end of the second resistor R1 is connected to the rechargeable power source, the other end is connected to one end of the third resistor R3 and the control end of the first switch circuit 101, and the other end of the third resistor R3 is grounded.
In practical application, the voltage dividing circuit may have other circuit structures, as long as the voltage dividing output function can be achieved, and the invention is not limited thereto.
In some alternative embodiments, the second switching circuit 103 includes: a first controlled switch and a second controlled switch;
the first end of the first controlled switch is connected with the chargeable power supply, the second end of the first controlled switch is connected with the first end of the second controlled switch, the control end receives a standby control signal of a power supply object, and the first controlled switch controls the first end and the second end of the first controlled switch to be connected when receiving the standby control signal of the power supply object;
a second terminal of the second controlled switch is connected to the voltage output terminal of the voltage dividing circuit 102, a control terminal is connected to the output terminal of the comparing circuit 104, and the second controlled switch is turned off when receiving the driving signal output from the comparing circuit.
The mode of jointly conducting circuit on-off control by utilizing the two controlled switches is adopted, one controlled switch is conducted after the power supply object is in standby, and the other controlled switch is conducted when the power supply object is externally powered, so that the automatic switching control of standby endurance and automatic charging of the chargeable power supply is realized by utilizing only the two controlled switches, the circuit structure is simple, and the production cost is further reduced.
In some alternative embodiments, the first controlled switch is a mechanical switch, the mechanical switch is disposed on the power supply object, and the mechanical switch is triggered to be turned on when the power supply object performs the standby action.
Therefore, the mechanical switch is automatically triggered to be conducted through the standby action of the power supply object by utilizing the characteristics of firmness, durability and low cost of the mechanical switch, and in addition, the mechanical switch action can be manually operated according to the actual requirement of a product, so that the product can be conveniently controlled to be invalid in the automatic standby mode or according to the endurance requirement of an actual power supply, the power supply can be manually controlled to be powered off, and the flexibility of the power supply power-off control is improved.
Illustratively, as shown in FIG. 2, the mechanical switch is a microswitch K1.
Due to the characteristics of compact structure, convenient installation and arrangement, reliable action and long service life of the micro switch K1, the micro switch is used as a standby trigger switch, so that the micro switch K1 is beneficial to realizing the miniaturization design of products and ensures the stability of the products.
It should be noted that the mechanical switch selecting micro switch K1 is only illustrative, and suitable switch types may be selected according to different usage scenarios, for example: when the micro switch K1 is used, the unfolding and folding states of the folding structure of the whole machine can be adapted, the micro switch is automatically triggered to be closed and opened, additional other operations are not needed, such as the whole machine has no folding structure, a shift switch can be adopted, the on and off can be realized through manual operation, and the micro switch K1 (or the same type switch) is used, so that a user does not need to memorize the switch state, the automatic switching is only performed according to the state of the whole machine, and the use experience of an actual user is better.
In addition, in practical applications, the first controlled switch may also use an electronic switch, such as a triode, a MOS transistor, etc., where, by connecting the base of the triode with the power supply object controller, when the controller monitors that the power supply object is in the standby mode, a high-level signal is sent to the base of the triode to control the triode to be turned on, so as to realize that the standby automatic control of the second switch circuit is turned on and the first switch circuit is turned off to disconnect the power supply connection between the battery and the main board.
In some alternative embodiments, as shown in fig. 2, the second controlled switch is a PNP transistor Q1.
By utilizing the characteristics of small size, light weight, low power consumption and low price of the PNP triode, the production cost can be reduced, and the power consumption of a circuit can be reduced.
In practical application, the second controlled switch may also be a P-type field effect transistor, an IGBT, or other switching devices, and the circuit connection mode and the working principle are the same, but in practical application, cost and MOS transistor driving voltage need to be considered to be appropriate. The flexible setting can be specifically performed according to the actual scene and the circuit performance requirement, and the invention is not limited to this.
In some alternative embodiments, as shown in fig. 2, the second switching circuit 103 further includes: and one end of the first resistor R2 is connected with the control end of the second controlled switch, and the other end of the first resistor R2 is grounded.
The first resistor R2 is arranged to filter the circuit, so that malfunction caused by the influence of noise signals on the second controlled switch is prevented, and the stability of circuit control is ensured.
In some alternative embodiments, as shown in fig. 2, the comparison circuit 104 includes: and the reverse input end of the comparator U2-A is connected with the chargeable power supply, the forward input end of the comparator U2-A is connected with a power supply interface of a power supply object, and the output end of the comparator U2-A is connected with the second control end of the second switch circuit 103.
The comparator U2-A is arranged to realize the signal comparison function, so that the cost is low, the reliability is high, and the product cost control is facilitated.
It should be noted that the comparison circuit 104 may be implemented by a digital processing chip with a voltage comparison function, such as an MCU, for example, but the invention is not limited thereto.
In some alternative embodiments, as shown in fig. 2, the power supply control circuit further includes: a first connection terminal CN1 and a second connection terminal CN2,
the power supply control circuit is connected with a chargeable power supply through a first connecting terminal CN 1;
the power supply control circuit is connected with a power supply interface of a power supply object through a second connecting terminal CN 2.
The connection of the power supply control circuit, the chargeable power supply and the power supply object is facilitated by the arrangement of the wiring terminal, and the installation and the maintenance are facilitated.
The working principle and working process of the power supply control circuit provided by the embodiment of the invention will be described in detail below with reference to specific application examples.
Taking the power supply control circuit shown in fig. 2 as an example, the rechargeable power source connected with CN1 is a battery, the power supply object connected with CN2 is a main board of the electric fan, in the prior art, the battery is directly connected with the main board, the battery cannot be disconnected at this time, the battery is continuously lost, the endurance time is shortened, if a switch is added between the battery and the main board, and after the switch is disconnected, the charging function of the battery cannot be realized. According to the embodiment of the invention, the micro switch K1 is added, and under the condition that a user does not use equipment (such as storage and standby), the micro switch K1 is contacted by changing the state of the whole machine (such as storage and folding), so that the state of the micro switch K1 is changed, in the scheme, a normally open switch is adopted, and after the whole machine is stored, the K1 is closed and conducted.
The battery and the main board are connected through a field effect transistor U1, R1 and R3 are driving resistors of U1, and in the embodiment of the invention, a single battery is taken as an example (the battery voltage is 3-4.2V), and the main board terminal charges the battery by outputting 5V.
VIN represents a main board input signal, namely an external power supply signal, VB represents a battery terminal voltage, under the condition that no VIN is input, the circuit is powered by a battery, the field effect transistor U1 is divided by the resistors R1 and R3, the conduction condition of the field effect transistor is met, at the moment, the U1 is conducted, and the battery voltage supplies power to the main board through the U1. When the equipment is in a storage state, the microswitch K1 is triggered to be closed, the emitter of the PNP type triode Q1 is connected with a battery, the Q1 base set is connected to GND through a resistor R2, the low-level conduction condition of the PNP type triode is met, the triode Q1 is conducted, the voltage of the triode VEC is 0, the K1 is connected with the Q1 in series and then connected with the resistor R1 in parallel, the voltage drop of a branch is 0 after the K1 is connected with the Q1 in series and then the voltage drop of two ends of the parallel resistor R1 is 0, the potentials of two ends of the field effect transistor G, S are equal, the conduction condition of the field effect transistor is not met, the U1 is turned off, the battery is disconnected from a main board, the battery is not connected with any load, no-load power consumption and power consumption are achieved, and the standby duration of the battery is prolonged. After Q1 is turned on, Q1 itself is used as a switching device, the loss is negligible, and the resistor R2 may be selected to have the lowest power consumption by selecting an appropriate resistance value, where although there is weak power consumption, the power consumption is negligible compared with the load power consumption before U1 is turned off.
When the battery needs to be charged, namely after the external adapter is inserted, the main board VIN outputs voltage, and the voltage is firstly connected with the battery through the body diode of the field effect transistor, but the parameters of the body diode are generally limited, the current is smaller, and the U1 needs to be synchronously turned on so as to meet the requirement of charging the battery with large current. U2-A is the comparator (4 foot and 8 foot are the power supply foot), 2 feet of the comparator are connected with the battery, as the reference voltage, 3 foot is connected with VIN, 1 foot is the comparator output, when 3 foot voltage is greater than the reference voltage (battery voltage), comparator output high level, otherwise be low level, VIN is after input, the voltage is pulled down by the battery voltage, but because field effect transistor self impedance produces the voltage drop, VIN > VB, satisfy the comparator judgement condition, comparator 1 foot output high level, because triode Q1 is low level drive, do not satisfy the drive condition at this moment, triode Q1 cuts off, resistance R1, R3 resumes the partial pressure state, satisfy the field effect transistor condition of opening, so U1 switches on, the mainboard is connected with the battery through U1, can charge for the battery at this moment.
When the adapter is pulled out, the voltage at VIN point is slightly lower than the voltage at VB point because of the conduction voltage drop of U1, and the condition that the comparator outputs high level (VIN > VB) is not satisfied at the moment, so that the comparator does not output, the comparator output is changed from high level to low level, the triode Q1 satisfies the conduction condition at the moment, and the voltage drop of the parallel resistor R1 becomes 0 because of Q1 conduction, and the U1 conduction condition is not satisfied, so that U1 is disconnected. As above, the requirements of rechargeable use after the adapter is inserted when the product is cut off the load during standby are met.
When the power supply control circuit is turned on by using the field effect transistor, the on-resistance exists, so that the on-voltage drop exists at the DS end of the field effect transistor, and the comparator is driven to work by using the characteristic of voltage difference before and after the on-voltage drop, so that the comparator outputs a driving signal, and the control circuit is turned on and off. Therefore, under the condition that external control signals are not added and a main control MCU is not added, the power supply control circuit adopting the self-driving of the internal circuit signals is added between the battery and the main board, the conventional controller circuit is not changed, the production cost is reduced, and the product performance is improved.
According to an embodiment of the present invention, there is provided an electrical apparatus, as shown in fig. 3, including: rechargeable power supply 201, power supply object 202, and power supply control circuit 203 provided by another embodiment of the present invention.
The electrical equipment provided by the embodiment of the invention realizes the power supply control between the chargeable power supply and the electrical equipment power supply object in a hardware circuit signal self-driving mode, does not need to add an external control signal and a controller, does not need to change the existing controller circuit, only needs to arrange the power supply control circuit between the chargeable power supply and the power supply object, and greatly reduces the production cost.
Specifically, the electrical device is an electric fan, the power supply object 202 is an electric fan main board, and the rechargeable power supply 201 is a battery. The specific structure and operation principle of the power supply control circuit 203 are referred to the above description of the power supply control circuit embodiment, and will not be described herein.
Therefore, the power supply control between the electric fan power supply and the electric fan main board is realized by utilizing the power supply control circuit, the automatic switching between the power off and the charging is realized while the power supply endurance life of the electric fan is prolonged, the production cost of the electric fan is reduced, and the use experience of a user is improved.
In some alternative embodiments, the electric fan is a foldable electric fan, and when the first controlled switch in the second switch circuit is a micro switch, the micro switch is disposed at a folding portion of the foldable electric fan, and triggers the micro switch to be turned on when the folding portion is folded.
Therefore, the electric fan is in a non-working state when being folded, the folding state and the unfolding state of the folding structure of the complete machine can be adapted, the micro switch is automatically triggered to be closed and opened, and the use experience of a user is further improved without additional other operations.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (13)
1. A power supply control circuit, characterized by comprising: the circuit comprises a first switch circuit, a voltage division circuit, a second switch circuit and a comparison circuit;
the voltage input end of the voltage dividing circuit is connected with a chargeable power supply;
the first end of the first switch circuit is connected with the chargeable power supply, the second end of the first switch circuit is connected with a power supply interface of a power supply object, the control end of the first switch circuit is connected with the voltage output end of the voltage dividing circuit, and the first end and the second end of the first switch circuit have conduction voltage drops when being conducted;
the first end of the second switch circuit is connected with the chargeable power supply, the second end of the second switch circuit is connected with the voltage output end of the voltage dividing circuit, the first control end receives the standby control signal of the power supply object, and the second control end is connected with the output end of the comparison circuit;
the first input end of the comparison circuit is connected with the chargeable power supply, the second input end of the comparison circuit is connected with a power supply interface of the power supply object, and the comparison circuit outputs a driving signal when the power supply interface of the power supply object is connected with external charging voltage, and the charging voltage of the chargeable power supply is larger than the power supply voltage of the chargeable power supply;
the second switch circuit is turned on when the standby control signal is received and the comparison circuit does not output a driving signal, and turned off when the standby control signal is not received or the comparison circuit outputs a driving signal.
2. The power supply control circuit of claim 1, wherein the first switching circuit comprises: the controlled switch is a P-type field effect transistor, the source electrode of the P-type field effect transistor is connected with the chargeable power supply, the drain electrode of the P-type field effect transistor is connected with a power supply interface of a power supply object, and the grid electrode of the P-type field effect transistor is connected with the voltage output end of the voltage dividing circuit.
3. The power supply control circuit of claim 1, wherein the second switching circuit comprises: a first controlled switch and a second controlled switch;
the first end of the first controlled switch is connected with the chargeable power supply, the second end of the first controlled switch is connected with the first end of the second controlled switch, the control end receives a standby control signal of the power supply object, and the first controlled switch controls the first end and the second end of the first controlled switch to be connected when receiving the standby control signal of the power supply object;
the second end of the second controlled switch is connected with the voltage output end of the voltage dividing circuit, the control end of the second controlled switch is connected with the output end of the comparison circuit, and the second controlled switch is turned off when receiving the driving signal output by the comparison circuit.
4. A power supply control circuit according to claim 3, wherein the first controlled switch is a mechanical switch provided on the power supply object, the mechanical switch being triggered to be turned on when the power supply object performs a standby action.
5. The power control circuit of claim 4 wherein the mechanical switch is a microswitch.
6. A power supply control circuit according to claim 3, wherein the second controlled switch is a PNP transistor.
7. The power supply control circuit of claim 3, wherein the second switching circuit further comprises: and one end of the first resistor is connected with the control end of the second controlled switch, and the other end of the first resistor is grounded.
8. The power supply control circuit of claim 1, wherein,
the comparison circuit includes: and the reverse input end of the comparator is connected with the chargeable power supply, the forward input end of the comparator is connected with the power supply interface of the power supply object, and the output end of the comparator is connected with the second control end of the second switch circuit.
9. The power supply control circuit according to any one of claims 1 to 8, characterized by further comprising: a first connection terminal and a second connection terminal,
the power supply control circuit is connected with the chargeable power supply through the first wiring terminal;
the power supply control circuit is connected with a power supply interface of the power supply object through the second connecting terminal.
10. The power supply control circuit of any one of claims 1-8, wherein the rechargeable power source is a battery.
11. An electrical device, comprising: rechargeable power supply, power supply object and power supply control circuit according to any of claims 1-10.
12. The electrical apparatus of claim 11, wherein the electrical apparatus is an electric fan and the power supply object is an electric fan main board.
13. The electrical device of claim 12, wherein the electric fan is a foldable electric fan, and when the first controlled switch in the second switching circuit is a micro switch, the micro switch is disposed at a folding portion of the foldable electric fan, and when the folding portion is folded, the micro switch is triggered to be turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310971321.5A CN116742759A (en) | 2023-08-02 | 2023-08-02 | Power supply control circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310971321.5A CN116742759A (en) | 2023-08-02 | 2023-08-02 | Power supply control circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116742759A true CN116742759A (en) | 2023-09-12 |
Family
ID=87901444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310971321.5A Pending CN116742759A (en) | 2023-08-02 | 2023-08-02 | Power supply control circuit and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116742759A (en) |
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2023
- 2023-08-02 CN CN202310971321.5A patent/CN116742759A/en active Pending
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