CN211015187U - Power supply circuit and power supply device - Google Patents
Power supply circuit and power supply device Download PDFInfo
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- CN211015187U CN211015187U CN201922490692.3U CN201922490692U CN211015187U CN 211015187 U CN211015187 U CN 211015187U CN 201922490692 U CN201922490692 U CN 201922490692U CN 211015187 U CN211015187 U CN 211015187U
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Abstract
The utility model discloses a power supply circuit and power supply unit, the circuit includes: the control circuit comprises a field effect transistor, wherein the first end of the field effect transistor is connected with an external power supply; the input end of the voltage stabilizing module is connected with the second end of the field effect transistor; the control circuit is used for controlling the field effect transistor to be conducted when receiving a starting signal so that the external power supply supplies power to the voltage stabilizing module; and controlling the field effect transistor to be cut off to stop supplying power to the voltage stabilizing module when a closing signal is received. The utility model discloses a switch on of control circuit control field effect transistor and the confession outage that ends realization voltage stabilizing module to the static consumption that control circuit consumed under the state that stops to supply power for voltage stabilizing module is extremely low, thereby can reduce supply circuit's static consumption effectively, prolongs external power source's life.
Description
Technical Field
The utility model relates to a circuit electron field especially relates to power supply circuit and power supply unit.
Background
The existing power supply mode is generally alternating current power supply or direct current power supply. The dc power supply is usually a battery pack formed by multiple dry batteries and used as a power supply to supply power to corresponding electronic devices. In the product that uses the dry battery to supply power, in order to reduce the battery and change the number of times, it is long to promote the use of battery, needs to reduce the consumption to promote the life of battery.
In the circuit operation process, static power consumption and dynamic power consumption are mainly included, wherein the static power consumption refers to power consumption when the circuit state is stable, and mainly comes from leakage current in the circuit operation process, so that part of electric quantity of a battery is consumed, and the battery consumes more electric quantity after a period of time to cause insufficient electric quantity.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a power supply circuit and power supply apparatus, which solve the problem of large static power consumption in the circuit stable state.
In order to achieve the above object, the present invention provides a power supply circuit, including:
the control circuit comprises a field effect transistor, wherein the first end of the field effect transistor is connected with an external power supply;
the input end of the voltage stabilizing module is connected with the second end of the field effect transistor;
the control circuit is used for controlling the field effect transistor to be conducted when receiving a starting signal so that the external power supply supplies power to the voltage stabilizing module; and controlling the field effect transistor to be cut off to stop supplying power to the voltage stabilizing module when a closing signal is received.
Optionally, the control circuit includes a transistor and a first resistor;
the base electrode of the triode is used for receiving high level or low level, the emitting electrode of the triode is grounded, the collector electrode of the triode is connected with the grid electrode of the field effect transistor, the collector electrode of the triode is further connected with the source electrode of the field effect transistor through the first resistor, the source electrode of the field effect transistor is connected with an external power supply, and the drain electrode of the field effect transistor is connected with the input end of the voltage stabilizing module.
Optionally, the control circuit further includes a second resistor, a third resistor, and a first capacitor; the base electrode of the triode receives high level or low level through the second resistor, the base electrode of the triode is connected with the emitting electrode of the triode through the third resistor, and the emitting electrode of the triode is further connected with the collector electrode of the triode through the first capacitor.
Optionally, the control circuit further includes a second capacitor, and the source of the field effect transistor is connected to the gate of the field effect transistor through the second capacitor.
Optionally, the control circuit further includes a fourth resistor, a first end of the fourth resistor is connected to the collector of the triode, and a second end of the fourth resistor is connected to the source of the field effect transistor through the second capacitor and the first resistor, respectively.
Optionally, the triode is an NPN-type triode, and the field effect transistor is a P-channel MOS transistor.
Optionally, the voltage stabilizing module includes a voltage stabilizing chip, a third capacitor and a fourth capacitor;
the input end of the voltage stabilizing chip is connected with the second end of the field effect transistor, the output end of the voltage stabilizing chip is connected with the electronic equipment, and the voltage stabilizing chip is used for supplying power to the electronic equipment;
the input end of the voltage stabilizing chip is grounded through the third capacitor, and the output end of the voltage stabilizing chip is grounded through the fourth capacitor.
Optionally, the voltage stabilizing module further includes a fifth capacitor connected in parallel to the third capacitor and having a capacitance value different from that of the third capacitor, and a sixth capacitor connected in parallel to the fourth capacitor and having a capacitance value different from that of the fourth capacitor.
Optionally, the voltage stabilization chip is of type ME6210a33 PG.
Further, in order to achieve the above object, the present invention also provides a power supply device including a power supply circuit connected to an external power supply, the power supply circuit being configured as the power supply circuit described above.
The utility model comprises a field effect transistor control circuit, when the control circuit receives the opening signal, the field effect transistor is controlled to be conducted to enable an external power supply to supply power for the voltage stabilizing module, so that the voltage stabilizing module outputs stable voltage; and when receiving the closing signal, controlling the field effect transistor to be cut off to stop supplying power to the voltage stabilizing module. And the static power consumption of the field effect transistor in the cut-off state is extremely low, so that the static power consumption of the power supply circuit can be effectively reduced, and the service life of an external power supply is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of an embodiment of the power supply circuit of the present invention;
fig. 2 is a schematic circuit diagram of the power supply circuit in the embodiment of fig. 1.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Control circuit | R3 | |
| 20 | Voltage stabilizing module | R4 | |
| 30 | External power supply | C1 | |
| 40 | Control signal | C2 | |
| 50 | Electronic device | C3 | Third capacitor |
| MOS | Field effect transistor | C4 | Fourth capacitor |
| Q | Triode transistor | C5 | Fifth capacitor |
| R1 | A first resistor | C6 | Sixth capacitor |
| R2 | Second resistance | LDO | Voltage stabilization chip |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a power supply circuit is applied to among the power supply unit, and this power supply unit can be connected with external power source 30 to output regulated voltage is the power supply of electronic equipment 50. The external power supply 30 may be a battery pack composed of dry batteries, and the electronic device 50 may be an intelligent door lock disposed on the door body. The power supply circuit can supply power to the door lock through the power supply voltage output by the external power supply 30, and reduce static power consumption when the power supply circuit and the door lock are in a stable state, so that the service life of the battery is prolonged.
Referring to fig. 1, in one embodiment, a power supply circuit includes a control circuit 10 and a voltage regulator module 20. The control circuit 10 includes a field effect transistor MOS, and a first terminal of the field effect transistor MOS is connected to the external power supply 30 to receive the power supply voltage output from the external power supply 30. The second terminal of the field effect transistor MOS is connected to the input terminal of the voltage regulation block 20. The control circuit 10 may receive a corresponding control signal 40, where the control signal 40 is an on signal or an off signal, and may control the MOS to be turned on when receiving the on signal, so that the external power supply 30 supplies power to the voltage stabilizing module 20, and the output terminal of the voltage stabilizing module 20 may output a stable voltage to supply power to the electronic device 50 when the external power supply 30 supplies power. The control circuit 10 may also control the field effect transistor MOS to be turned off to stop supplying power to the voltage stabilizing module 20 when receiving the off signal. At this time, the leakage current of the field effect transistor MOS in the off state is nano-ampere, that is, the static power consumption consumed by the field effect transistor MOS is extremely low. It will be appreciated that the control signal 40 may be issued by a master control chip connected to the control circuit 10. The first terminal of the field effect transistor MOS may be a source or a drain of the field effect transistor MOS, and accordingly, the second terminal may be a drain or a source corresponding to the first terminal.
In this embodiment, by providing the control circuit 10 and the voltage stabilizing module 20, when the main control chip sends an on signal or an off signal, the control circuit 10 can receive the corresponding control signal 40. If the control circuit 10 receives the turn-on signal, the control circuit 10 conducts the external power 30 with the voltage regulation module 20 to supply power to the voltage regulation module 20, so that the voltage regulation module 20 outputs a regulated voltage. If the control circuit 10 receives the shutdown signal, the control circuit 10 stops supplying power to the voltage stabilizing module 20. And the static power consumption of the field effect transistor MOS in the off state is extremely low, so that the static power consumption of the power supply circuit can be effectively reduced, and the service life of the external power supply 30 is prolonged.
Further, referring to fig. 1 and fig. 2 together, the control circuit 10 further includes a transistor Q and a first resistor R1. The base of the transistor Q may receive a high level or a low level sent by a main control chip of the electronic device 50, where the high level is a turn-on signal and the low level is a turn-off signal. The emitting electrode of the triode Q is grounded, the collecting electrode of the triode Q is connected with the grid electrode of the field effect transistor MOS, the collecting electrode of the triode Q is further connected with the source electrode of the field effect transistor MOS through the first resistor R1, the source electrode of the field effect transistor MOS is connected with the external power supply 30, and the drain electrode of the field effect transistor MOS is connected with the input end of the voltage stabilizing module 20. The triode Q is an NPN type triode Q, and the field effect transistor MOS is a P channel MOS tube. When the base of the triode Q receives a low level, the triode Q is turned off, the collector of the triode Q is at a high level, the gate of the field effect transistor MOS connected to the collector of the triode Q is at a high level, the field effect transistor MOS is also in a turned-off state, and at this time, the external power supply 30 stops supplying power to the voltage stabilizing module 20. Because the leakage currents of the triode Q and the field effect transistor MOS in the cut-off state are both nano-ampere levels, the static power consumption of the triode Q and the field effect transistor MOS is extremely low, and therefore the static power consumption is reduced when the power supply circuit does not supply power to the voltage stabilizing module 20. It should be noted that the transistor Q may also perform an isolation function to prevent the power voltage output by the external power supply 30 from flowing back to the external chip outputting the control signal 40 and causing chip damage.
Further, the control circuit 10 may further include a second resistor R2, a third resistor R3, and a first capacitor C1. The base of the triode Q receives high level or low level through the second resistor R2, the base of the triode Q is connected with the emitting electrode of the triode Q through the third resistor R3, and the emitting electrode of the triode Q is also connected with the collecting electrode of the triode Q through the first capacitor C1. The second resistor R2 may function as a current limiting function to prevent the transistor Q from being damaged due to excessive current. The third resistor R3 is a bias resistor and can provide a quiescent operating point for the transistor Q. The first capacitor C1 can suppress the collector-emitter voltage jump of the transistor Q.
In the above embodiment, the control circuit 10 may further include a second capacitor C2 and a fourth resistor R4. The source of the field effect transistor MOS may be connected to the gate of the field effect transistor MOS via a second capacitor C2. The second capacitor C2 can prevent the field effect transistor MOS from being abnormal due to voltage dip when the field effect transistor MOS is turned from the off state to the on state. In the embodiment with the fourth resistor R4, the collector of the transistor Q is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected to the source of the field effect transistor MOS through the second capacitor C2 and the first resistor R1, respectively. The fourth resistor R4 can play a role in limiting current when the second capacitor C2 or the first resistor R1 is abnormal, and circuit components are prevented from being damaged due to overlarge current.
Further, the voltage regulation module 20 may include a voltage regulation chip L DO, a third capacitor C3, and a fourth capacitor C4. the input terminal of the voltage regulation chip L DO is connected to the second terminal of the field effect transistor MOS, and the output terminal of the voltage regulation chip L DO is connected to the electronic device 50 to supply power to the electronic device 50.
The input end of the voltage stabilizing chip L DO is grounded through a third capacitor C3, and the output end of the voltage stabilizing chip L DO is grounded through a fourth capacitor C4, the third capacitor C3 and the fourth capacitor C4 can be used as filter circuits to respectively filter the input end and the output end of the voltage stabilizing chip L DO so as to filter the frequency of a specific waveband in the voltage, and therefore, the interference signals in the voltage are filtered.
Optionally, the voltage stabilizing module 20 may further include a fifth capacitor C5 connected in parallel to the third capacitor C3, and a sixth capacitor C6 connected in parallel to the fourth capacitor C4, wherein a capacitance value of the fifth capacitor C5 is different from a capacitance value of the third capacitor C3, and a capacitance value of the sixth capacitor C6 is also different from a capacitance value of the fourth capacitor C4.
It should be noted that the regulator chip L DO may be a ME6210a33PG type low dropout regulator, and the ME6210a33PG type low dropout regulator has no enable pin inside, so the cost is lower than that of the other low dropout regulator chip L DO, thereby effectively reducing the overall cost of the power supply circuit.
The utility model also provides a power supply unit, this power supply unit include the supply circuit who is connected with external power source, and above-mentioned embodiment can be referred to this supply circuit's structure, no longer gives unnecessary details here. It should be understood that, since the power supply device of the present embodiment adopts the technical solution of the power supply circuit, the power supply device has all the beneficial effects of the power supply circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A power supply circuit, comprising:
the control circuit comprises a field effect transistor, wherein the first end of the field effect transistor is connected with an external power supply;
the input end of the voltage stabilizing module is connected with the second end of the field effect transistor;
the control circuit is used for controlling the field effect transistor to be conducted when receiving a starting signal so that the external power supply supplies power to the voltage stabilizing module; and controlling the field effect transistor to be cut off to stop supplying power to the voltage stabilizing module when a closing signal is received.
2. The power supply circuit of claim 1 wherein said control circuit comprises a transistor and a first resistor;
the base electrode of the triode is used for receiving high level or low level, the emitting electrode of the triode is grounded, the collector electrode of the triode is connected with the grid electrode of the field effect transistor, the collector electrode of the triode is further connected with the source electrode of the field effect transistor through the first resistor, the source electrode of the field effect transistor is connected with an external power supply, and the drain electrode of the field effect transistor is connected with the input end of the voltage stabilizing module.
3. The power supply circuit of claim 2 wherein said control circuit further comprises a second resistor, a third resistor and a first capacitor; the base electrode of the triode receives high level or low level through the second resistor, the base electrode of the triode is connected with the emitting electrode of the triode through the third resistor, and the emitting electrode of the triode is further connected with the collector electrode of the triode through the first capacitor.
4. The power supply circuit of claim 3 wherein the control circuit further comprises a second capacitor, the source of the field effect transistor being connected to the gate of the field effect transistor through the second capacitor.
5. The power supply circuit of claim 4 wherein the control circuit further comprises a fourth resistor, a first terminal of the fourth resistor being coupled to the collector of the transistor, and a second terminal of the fourth resistor being coupled to the source of the field effect transistor via the second capacitor and the first resistor, respectively.
6. The power supply circuit of claim 2 wherein said transistor is an NPN transistor and said field effect transistor is a P-channel MOS transistor.
7. The power supply circuit according to any one of claims 1 to 6, wherein the voltage stabilizing module comprises a voltage stabilizing chip, a third capacitor and a fourth capacitor;
the input end of the voltage stabilizing chip is connected with the second end of the field effect transistor, the output end of the voltage stabilizing chip is connected with the electronic equipment, and the voltage stabilizing chip is used for supplying power to the electronic equipment;
the input end of the voltage stabilizing chip is grounded through the third capacitor, and the output end of the voltage stabilizing chip is grounded through the fourth capacitor.
8. The power supply circuit according to claim 7, wherein the voltage regulator module further comprises a fifth capacitor connected in parallel with the third capacitor and having a different capacitance value from the third capacitor, and a sixth capacitor connected in parallel with the fourth capacitor and having a different capacitance value from the fourth capacitor.
9. The power supply circuit of claim 7 wherein the voltage regulation chip is model ME6210A33 PG.
10. A power supply device characterized by comprising a power supply circuit connected to an external power supply, the power supply circuit being configured as the power supply circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922490692.3U CN211015187U (en) | 2019-12-31 | 2019-12-31 | Power supply circuit and power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922490692.3U CN211015187U (en) | 2019-12-31 | 2019-12-31 | Power supply circuit and power supply device |
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| Publication Number | Publication Date |
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| CN211015187U true CN211015187U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922490692.3U Active CN211015187U (en) | 2019-12-31 | 2019-12-31 | Power supply circuit and power supply device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271000A (en) * | 2021-04-28 | 2021-08-17 | 精进电动科技股份有限公司 | Awakening enabling circuit and motor controller |
| CN113589718A (en) * | 2021-07-12 | 2021-11-02 | 未来穿戴技术有限公司 | Startup and shutdown control circuit, control method, storage medium and massage equipment |
-
2019
- 2019-12-31 CN CN201922490692.3U patent/CN211015187U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271000A (en) * | 2021-04-28 | 2021-08-17 | 精进电动科技股份有限公司 | Awakening enabling circuit and motor controller |
| CN113589718A (en) * | 2021-07-12 | 2021-11-02 | 未来穿戴技术有限公司 | Startup and shutdown control circuit, control method, storage medium and massage equipment |
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