CN213693169U - Power supply device and battery protection board - Google Patents
Power supply device and battery protection board Download PDFInfo
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- CN213693169U CN213693169U CN202022004941.6U CN202022004941U CN213693169U CN 213693169 U CN213693169 U CN 213693169U CN 202022004941 U CN202022004941 U CN 202022004941U CN 213693169 U CN213693169 U CN 213693169U
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Abstract
The utility model discloses a power supply unit and battery protection shield, power supply unit includes: a control section for providing a power supply control signal; the driving part is connected with the control part and is controlled by the power supply control signal to change the working state of the driving part and generate a driving signal; the voltage stabilizing part is used for performing voltage stabilizing treatment on the input voltage to obtain stable power supply voltage; the electric isolation part is connected with the driving part and the voltage stabilizing part and is used for electrically isolating the control part and the driving part from the voltage stabilizing part; the electric isolation part is also used for controlling the input voltage to be input to the voltage stabilizing part under the condition that the driving signal is received, and controlling the input voltage not to be input to the voltage stabilizing part under the condition that the driving signal is not received. The utility model discloses whole power supply control process has avoided using key switch, and control and power supply are more stable, adopt electrical isolation between power supply control return circuit and the supply voltage steady voltage return circuit, and the product is more reliable.
Description
Technical Field
The utility model relates to a power supply technical field, concretely relates to power supply unit and battery protection shield.
Background
At present, many electronic devices or devices need to be provided with a battery for supplying power, such as a lithium battery. Battery protection plates are often required for batteries to support the batteries for efficient and reliable battery powered operation. The power supply mode of the battery protection board in the prior art mainly comprises: when the battery protection board needs to supply power, the key switch is turned on, and when the battery protection board does not need to supply power, the key switch is turned off. This approach has the following problems:
1. when the key switch is in poor contact or is aged, an error signal is easily generated, and the output of the power supply voltage of the battery protection board is further influenced.
2. The power supply control loop of the battery protection board is not isolated from the charger, and if the power supply control loop is abnormal, the normal work of the charger is easily influenced.
Disclosure of Invention
The utility model discloses to the proposition of above problem, and provide a power supply unit that the power supply is stable, the product is reliable, still provide a battery protection shield that possesses this kind of power supply unit simultaneously.
The utility model discloses a technical means be: provided is a power supply device including:
a control section for providing a power supply control signal;
the driving part is connected with the control part, is controlled by the power supply control signal to change the working state of the driving part and generates a driving signal;
the voltage stabilizing part is used for performing voltage stabilizing treatment on the input voltage to obtain stable power supply voltage; and
the electric isolation part is connected with the driving part and the voltage stabilizing part and is used for electrically isolating the control part and the driving part from the voltage stabilizing part; the electric isolation part is also used for controlling the input voltage to be input to the voltage stabilizing part under the condition that the driving signal is received, and controlling the input voltage not to be input to the voltage stabilizing part under the condition that the driving signal is not received.
The utility model discloses another technical means who adopts is: a battery protection board is provided, which comprises the power supply device.
Since the technical scheme is used, the utility model provides a power supply unit and battery protection shield utilizes control part, drive division and electrical isolation portion to control the power supply of battery protection shield. When the control part outputs the power supply control signal, the driving part generates a driving signal, the electric isolation part controls the input voltage to be input to the voltage stabilizing part, and the voltage stabilizing part outputs the stable power supply voltage. When the control part does not output the power supply control signal, the driving part does not generate the driving signal, the electric isolation part controls the input voltage not to be input to the voltage stabilizing part, and the voltage stabilizing part does not output the power supply voltage. The whole power supply control process avoids using a key switch, the control and the power supply are more stable, the power supply control loop and the power supply voltage stabilizing loop are electrically isolated, and the product is more reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram showing the structure of a power supply device in one embodiment;
FIG. 2 is a block diagram showing the structure of a power supply device in one embodiment;
FIG. 3 is a circuit schematic of a power supply apparatus in one embodiment;
fig. 4 is a schematic structural view of a battery protection plate in one embodiment.
In the figure: 1. power supply unit, 2, charger, 3, battery protection board, 11, control part, 12, drive division, 13, steady voltage portion, 14, electrical isolation portion, 15, power supply portion, 16, first output, 17, second output, 21, second power end, 22, second earthing terminal, 131, sampling module, 132, voltage adjustment module, 133, voltage division module, 141, light emitting module, 142, light receiving module, 151, first power end, 152, first earthing terminal.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and not limitation. In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
The utility model provides a power supply unit 1, in an embodiment, as shown in fig. 1, the device can include: control unit 11, drive unit 12, voltage regulator unit 13, and electrical isolation unit 14. The control unit 11 is configured to provide a power supply control signal. The power supply device 1 may supply power to a load connected thereto, and the control unit 11 outputs the power supply control signal when the load needs to supply power, and the control unit 11 does not output the power supply control signal when the load does not need to supply power. The power supply device 1 provides a supply voltage for the load, and the supply voltage may be matched according to a power supply requirement required by the load, such as 5V, 12V, and the like, which are commonly used, and may be other voltages, for example, the supply voltage shown in fig. 3 is 5V. The load may be the battery protection plate 3, but may be other loads.
The control unit 11 of this embodiment may be a single chip IC1, a microcontroller, a CPU, or other control units with equivalent control functions, and exemplarily, the control unit 11 shown in fig. 3 includes a single chip IC 1. The power supply control signal may be output from a signal output interface of the control unit 11, and in order to distinguish whether the power supply control signal is output, the signal output interface may present different logic levels based on different situations in which the power supply control signal is output and the power supply control signal is not output, for example, the power supply control signal may be a high level, and the signal output interface may output a low level when the power supply control signal is not output, or the power supply control signal may be a low level, and the signal output interface may output a high level when the power supply control signal is not output. In the case where the power supply control signal shown in fig. 3 is at a high level, the drive unit 12 generates a drive signal when receiving a high level output from the control unit 11, and the drive unit 12 does not generate a drive signal when receiving a low level output from the control unit 11.
The driving part 12 is connected to the control part 11, and is controlled by the power supply control signal to change its working state and generate a driving signal. Further, the driving portion 12 may have an on state and an off state, and when receiving the power supply control signal, the driving portion 12 may adjust its operating state to the on state to generate the driving signal, and when not receiving the power supply control signal, the driving portion 12 may adjust its operating state to the off state to generate the driving signal.
The voltage stabilizing unit 13 according to this embodiment is used for performing voltage stabilizing processing on the input voltage to obtain a stable power supply voltage. The voltage stabilizer 13 may detect the power supply voltage in real time, and if the power supply voltage changes unstably, the voltage stabilizer 13 performs a voltage stabilizing operation. The input voltage can be distributed to both the divided voltage formed by the voltage regulator 13 and the supply voltage. The voltage stabilization processing operation includes: when the input voltage increases, the voltage stabilizing unit 13 increases the divided voltage formed by the voltage stabilizing unit and then decreases the supply voltage, and when the input voltage decreases, the voltage stabilizing unit 13 decreases the divided voltage formed by the voltage stabilizing unit and then increases the supply voltage, thereby ensuring that the supply voltage is stable regardless of changes in the input voltage. The change of the increase or decrease of the input voltage can be obtained by the voltage stabilizer 13 through real-time detection of the power supply voltage.
In this embodiment, the electrical isolation unit 14 is connected to the driving unit 12 and the voltage stabilizing unit 13, and is configured to electrically isolate the control unit 11 and the driving unit 12 from the voltage stabilizing unit 13, that is, the control unit 11 is electrically isolated from the voltage stabilizing unit 13, the driving unit 12 is electrically isolated from the voltage stabilizing unit 13, no electrical isolation is performed between the control unit 11 and the driving unit 12, and the voltage stabilizing unit 13 receives an input voltage and controls whether a power supply voltage is stable, so that a loop where the input voltage and the power supply voltage are located is equivalent to a loop where the input voltage and the power supply voltage are located, and the loop is in an electrical isolation state with the control unit 11 and the driving unit 12.
When the driving signal is received, the electrical isolation unit 14 controls the input voltage to be input to the voltage regulator unit 13, and when the driving signal is not received, the electrical isolation unit 14 controls the input voltage not to be input to the voltage regulator unit 13. The electrical isolation unit 14, in addition to having an electrical isolation function, controls whether the voltage regulator unit 13 can input the input voltage, which may be provided by another external power output component, for example, the input voltage may be provided by a charger 2 capable of charging a battery.
The present embodiment controls the power supply to the battery protection board 3 by the control part 11, the driving part 12, and the electrical isolation part 14. When the control unit 11 outputs the power supply control signal, the driving unit 12 generates the driving signal, and the electrical isolation unit 14 controls the input voltage to be input to the voltage stabilizing unit 13, and the voltage stabilizing unit 13 outputs the stable power supply voltage. When the control unit 11 does not output the power supply control signal, the driving unit 12 does not generate the driving signal, the electrical isolation unit 14 controls the input voltage not to be input to the voltage stabilizing unit 13, and the voltage stabilizing unit 13 does not output the power supply voltage. The whole power supply control process avoids using a key switch, the control and the power supply are more stable, the power supply control loop and the power supply voltage stabilizing loop are electrically isolated, and the product is more reliable.
In one embodiment, as shown with reference to fig. 2, the electrical isolation part 14 may employ an optoelectronic isolation assembly, which may have a light emitting module 141 and a light receiving module 142. The light emitting module 141 is used to emit or not emit a light signal based on whether or not the driving signal is received. If the driving signal is received, the light emitting module 141 emits a light signal, and if the driving signal is not received, the light emitting module 141 does not emit the light signal. The light receiving module 142 is configured to provide a path for the input voltage to be input to the voltage regulator 13 when the light signal is received. If the optical signal is not received, the optical receiving module 142 disconnects the input path from the input voltage to the voltage regulator 13. The electrical isolation portion 14 may also be implemented by a magnetic electrical isolation component, and other isolation components that can achieve electrical isolation. The control driving part and the load part of the power supply are isolated, so that the influence of the control driving part on the load part caused by the problem can be avoided, the control driving part cannot be influenced when the load is abnormal, the insulating capability between input and output is improved, the design cost of the product can be reduced, and the reliability of the product is improved.
In one embodiment, as shown with reference to fig. 2 and 3, the power supply device 1 may further include a power supply part 15. The power supply unit 15 is configured to provide operating power to the control unit 11, the driving unit 12, and the light emitting module 141. The power supply part 15 has a first power terminal 151 and a first ground terminal 152. The output voltage of the power supply unit 15 may be matched according to the power supply requirements of the control unit 11, the driving unit 12 and the light emitting module 141, and the output voltage of the power supply unit 15 shown in fig. 3 is exemplarily 5V, but the power supply unit 15 may output other voltages besides 5V, for example, the network reference VDD in fig. 3 may also be the output voltage of the power supply unit 15. The input voltage may be provided by a charger 2, and when the load of the power supply device 1 is a battery protection board 3, the charger 2 may also charge the battery. The charger 2 has a second power supply terminal 21 and a second ground terminal 22, and the network reference B + shown in fig. 3 is the second power supply terminal 21. The first ground terminal 152 is not grounded to the second ground terminal 22, the control unit 11, the driving unit 12, and the light emitting module 141 are grounded to each other, and the light emitting module 141, the voltage stabilizing unit 13, and the charger 2 are grounded to each other.
In one embodiment, referring to fig. 3, the control part 11 may include a single chip IC1, and the power supply control signal is output from a preset IO interface of the single chip IC 1. Illustratively, the model of the single chip IC1 shown in fig. 3 is PIC12F615, and the preset IO interface is AN1 pin of the single chip IC 1. The driving part 12 may include a driving resistor R3, a first bias resistor R4, and a switching tube Q1. The switching tube Q1 may be a transistor, a MOS transistor, other controllable electronic switches, etc., and for example, the switching tube Q1 shown in fig. 3 employs a transistor. The switch tube Q1 has a switch control end, a first switch end and a second switch end, when the switch tube Q1 is a transistor, the switch control end is the base of the transistor, the first switch end is the collector of the transistor, and the second switch end is the emitter of the transistor. The driving resistor R3 is arranged between the preset IO interface and the switch control end. The switch control end can receive the power supply control signal transmitted by the preset IO interface. Two ends of the first bias resistor R4 are respectively connected with the switch control end and the second switch end. The first switch terminal is used for outputting the driving signal to the electrical isolation portion 14, and the second switch terminal is connected to the first ground terminal 152. If the switch control end receives the power supply control signal, the switching tube Q1 is turned on, the first switch end and the second switch end are connected, and the driving signal output by the first switch end is at a low level. If the switch control end does not receive the power supply control signal, the switching tube Q1 is turned off, the first switch end and the second switch end are disconnected, and the first switch end does not output the driving signal as a low level. Referring to fig. 3, a capacitor C1 is connected in parallel across the first bias resistor R4.
In one embodiment, referring to fig. 3, the optoelectronic isolation assembly may include a first pull-up resistor R1, a first current limiting resistor R2, a photo-coupler IC2, a second pull-up resistor R6, and a second current limiting resistor R5. For example only, as shown in fig. 3, the photocoupler IC2 may be selected from PC 817. The photocoupler IC2 has a light emitting diode and a phototransistor. The first current limiting resistor R2 is connected in series with the light emitting diode to form a series branch, one end of the series branch is connected to the first power source terminal 151, and the other end of the series branch receives the driving signal. The first pull-up resistor R1 is connected in parallel with the series branch. Specifically, the cathode K of the light emitting diode is connected to the first switch terminal of the switch Q1, and the anode a is connected to the first power source terminal 151 via a first current limiting resistor R2. The collector of the phototriode is connected with the second power end 21 through the second pull-up resistor R6 and the second current-limiting resistor R5 which are connected in series, and the emitter of the phototriode is connected with the voltage stabilizing part 13. The first pull-up resistor R1, the first current limiting resistor R2, and the light emitting diode constitute the light emitting module 141. The photo transistor, the second pull-up resistor R6 and the second current limiting resistor R5 form the light receiving module 142.
In one embodiment, referring to fig. 2 and 3, the pressure stabilizer 13 may include: a sampling module 131, a voltage adjustment module 132, and a voltage division module 133. The sampling module 131 is configured to sample the power supply voltage and generate a sampling voltage. The voltage adjusting module 132 is connected to the sampling module 131, and is configured to output a voltage adjusting signal according to a comparison between the sampled voltage and a reference voltage, where the reference voltage may be generated inside the voltage adjusting module 132. The voltage dividing module 133 is connected to the voltage adjusting module 132, and configured to divide the input voltage according to the voltage adjusting signal and form a divided voltage, so as to stabilize the power supply voltage.
In one embodiment, if the sampling voltage is higher than the reference voltage, the voltage adjustment signal controls the divided voltage to increase, and then the power supply voltage decreases. If the sampling voltage is lower than the reference voltage, the voltage adjustment signal controls the divided voltage to decrease, and then the power supply voltage increases. The embodiment can perform accurate voltage stabilization regulation to output stable power supply voltage to supply to a load.
In one embodiment, as shown with reference to fig. 3, the power supply device 1 may have a first output terminal 16 and a second output terminal 17. The first output terminal 16 is used for outputting the supply voltage, the second output terminal 17 is connected to the second ground terminal 22, and the network reference Vcc in fig. 3 indicates the first output terminal 16. A filter capacitor EC3 may be connected in parallel between the first output terminal 16 and the second output terminal 17. The sampling module 131 may include a first sampling resistor R7 and a second sampling resistor R8 connected in series between the first output terminal 16 and the second output terminal 17. The voltage regulation module 132 may include a controllable regulator IC3, the controllable regulator IC3 having a reference electrode R, an anode a, and a cathode K. The controllable voltage-stabilizing source IC3 can adopt KA 431. And two ends of the second sampling resistor R8 are respectively connected with the reference pole R and the anode A. The cathode K outputs the voltage adjustment signal to the voltage dividing module 133, and is connected to the second power end 21 through the light receiving module 142. The voltage adjustment module 132 may further include a capacitor C2, wherein one end of the capacitor C2 is connected to the cathode K, and the other end of the capacitor C2 is connected to a serial connection point of the first sampling resistor R7 and the second sampling resistor R8. The configuration of the capacitor C2 makes it easier for the voltage adjustment module 132 to learn about changes in the supply voltage.
In one embodiment, referring to fig. 3, the voltage divider module 133 may include a transistor Q2. The base of the transistor Q2 is connected to the cathode K to receive the voltage adjustment signal. The collector of the transistor Q2 is connected to the second power terminal 21, and the emitter of the transistor Q2 is connected to the first output terminal 16. The voltage adjustment signal adjusts the divided voltage formed between the collector and emitter of the transistor Q2 by adjusting the base current of the transistor Q2.
The operation of the power supply device is described in connection with fig. 3. As shown in fig. 3, when the preset IO interface of the single chip IC1, for example, AN1 pin, outputs the power supply control signal, the power supply control signal shown in fig. 3 is at a high level, and the switching transistor Q1 is turned on. The collector of the switch Q1 outputs a driving signal, which is low in fig. 3, and the cathode K of the light emitting diode is low. The 5V voltage output by the power supply part 15 passes through the first pull-up resistor R1 and the first current limiting resistor R2, the light emitting diode is conducted to emit a light signal, the phototriode is conducted after receiving the light signal, and the base of the transistor Q2 forms a base current. If the input voltage provided by the charger 2 increases, the supply voltage increases accordingly, and the sampling voltage across the second sampling resistor R8 also increases. If the sampling voltage is higher than the reference voltage in the controllable voltage-regulator source IC3, the controllable voltage-regulator source IC3 adjusts the base current of the triode Q2 to increase the divided voltage formed between the collector and the emitter of the triode Q2 of the Q2, so as to offset the increased input voltage and reduce the power supply voltage to keep stability. If the input voltage provided by the charger 2 decreases, the supply voltage decreases accordingly, and the sampling voltage across the second sampling resistor R8 also decreases. If the sampling voltage is lower than the reference voltage in the controllable voltage-regulator IC3, the controllable voltage-regulator IC3 adjusts the base current of the triode Q2 to reduce the divided voltage formed between the collector and the emitter of the triode Q2 of the Q2, so as to offset the reduced input voltage and increase and stabilize the power supply voltage. The utility model also provides a battery protection shield 3, in an embodiment, refer to fig. 4 and show, battery protection shield 3 can include power supply unit 1 of any preceding embodiment. The power supply device 1 supplies power to the battery protection board 3, and specifically, the power supply device 1 can supply power to the wake-up circuit on the battery protection board 3. The battery protection board 3 works more stably and reliably, and if the battery protection board 3 is taken as a load, the influence on the control part of the power supply device 1 is lower.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. A power supply device, characterized in that the power supply device comprises:
a control section for providing a power supply control signal;
the driving part is connected with the control part, is controlled by the power supply control signal to change the working state of the driving part and generates a driving signal;
the voltage stabilizing part is used for performing voltage stabilizing treatment on the input voltage to obtain stable power supply voltage; and
the electric isolation part is connected with the driving part and the voltage stabilizing part and is used for electrically isolating the control part and the driving part from the voltage stabilizing part; the electric isolation part is also used for controlling the input voltage to be input to the voltage stabilizing part under the condition that the driving signal is received, and controlling the input voltage not to be input to the voltage stabilizing part under the condition that the driving signal is not received.
2. The power supply device according to claim 1,
the electrical isolation part adopts a photoelectric isolation assembly which comprises:
a light emitting module for emitting or not emitting a light signal based on whether or not the driving signal is received; and
a light receiving module; and the path is used for providing a path for the input voltage to be input into the voltage stabilizing part under the condition of receiving the optical signal.
3. The power supply device according to claim 2,
the power supply device also comprises a power supply part which is used for providing working power supply for the control part, the driving part and the light emitting module; the power supply part is provided with a first power supply end and a first grounding end;
the input voltage is provided by a charger; the charger has a second power supply terminal and a second ground terminal; the first ground terminal and the second ground terminal are not grounded in common.
4. The power supply device according to claim 3,
the control part comprises a single chip microcomputer, and the power supply control signal is output by a preset IO interface of the single chip microcomputer;
the driving part comprises a driving resistor, a first bias resistor and a switching tube; the switch tube is provided with a switch control end, a first switch end and a second switch end; the driving resistor is arranged between the preset IO interface and the switch control end; two ends of the first bias resistor are respectively connected with the switch control end and the second switch end; the first switch end is used for outputting the driving signal to the electric isolation part, and the second switch end is connected with the first grounding end.
5. The power supply device according to claim 3,
the photoelectric isolation assembly comprises a first pull-up resistor, a first current-limiting resistor, a photoelectric coupler, a second pull-up resistor and a second current-limiting resistor; the photoelectric coupler is provided with a light emitting diode and a photosensitive triode;
the first current-limiting resistor and the light-emitting diode are connected in series to form a series branch, one end of the series branch is connected with the first power end, the other end of the series branch receives the driving signal, the anode of the light-emitting diode is connected with the first current-limiting resistor, and the cathode of the light-emitting diode receives the driving signal; the first pull-up resistor is connected with the series branch in parallel;
the collector of the phototriode is connected with the second power supply end through the second pull-up resistor and the second current-limiting resistor which are connected in series, and the emitter of the phototriode is connected with the voltage stabilizing part;
the first pull-up resistor, the first current-limiting resistor and the light emitting diode form the light emitting module; the phototriode, the second pull-up resistor and the second current-limiting resistor form the light receiving module.
6. The power supply device according to claim 3, wherein the voltage stabilizing section includes:
the sampling module is used for sampling the power supply voltage and generating a sampling voltage;
the voltage adjusting module is connected with the sampling module and used for outputting a voltage adjusting signal according to the comparison condition of the sampling voltage and the reference voltage; and
and the voltage division module is connected with the voltage adjustment module and used for dividing the input voltage according to the voltage adjustment signal and forming a divided voltage so as to stabilize the power supply voltage.
7. The power supply device according to claim 6,
the power supply device is provided with a first output end and a second output end; the first output end is used for outputting the power supply voltage, and the second output end is connected with the second grounding end;
the sampling module comprises a first sampling resistor and a second sampling resistor coupled in series between the first output terminal and the second output terminal;
the voltage adjusting module comprises a controllable voltage-stabilizing source, and the controllable voltage-stabilizing source is provided with a reference electrode, an anode and a cathode; two ends of the second sampling resistor are respectively connected with the reference electrode and the anode; the cathode outputs the voltage adjusting signal to the voltage dividing module and is connected with the second power end through the light receiving module.
8. The power supply device according to claim 7,
the voltage division module comprises a triode, and the base electrode of the triode is connected with the cathode to receive the voltage adjustment signal; the collector of the triode is connected with the second power supply end, and the emitter of the triode is connected with the first output end;
the voltage adjusting signal adjusts the divided voltage formed between the collector and the emitter of the triode by adjusting the base current of the triode.
9. A battery protection plate characterized by comprising the power supply device according to any one of claims 1 to 8.
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|---|---|---|---|
| CN202022004941.6U CN213693169U (en) | 2020-09-14 | 2020-09-14 | Power supply device and battery protection board |
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| CN202022004941.6U CN213693169U (en) | 2020-09-14 | 2020-09-14 | Power supply device and battery protection board |
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| CN213693169U true CN213693169U (en) | 2021-07-13 |
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