CN219041637U - Low-power consumption isolation standby switch circuit and power supply circuit - Google Patents
Low-power consumption isolation standby switch circuit and power supply circuit Download PDFInfo
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- CN219041637U CN219041637U CN202223088721.1U CN202223088721U CN219041637U CN 219041637 U CN219041637 U CN 219041637U CN 202223088721 U CN202223088721 U CN 202223088721U CN 219041637 U CN219041637 U CN 219041637U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to the technical field of power supplies, in particular to a low-power-consumption isolation standby switch circuit and a power supply circuit. Comprising the following steps: the optocoupler comprises a light emitting part and a light receiving part; the power supply VCC is grounded through a resistor R1, a light-emitting part and a switching tube Q1 which are connected in series; the signal receiving end is electrically connected with the control end of the switching tube Q1 and controls the on-off of the switching tube Q1; the wake-up power supply VDD is grounded through a resistor R5, a resistor R4 and a light receiving part which are connected in series, the wake-up circuit VDD is also connected with a power supply output end through a switch tube Q2, and a control end of the switch tube Q2 is connected with an output end of the resistor R5. The utility model can avoid false triggering by arranging the optocoupler for isolation, and is convenient to use.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a low-power-consumption isolation standby switch circuit and a power supply circuit.
Background
At present, when the sound equipment is used, the sound equipment is generally connected with the mains supply and is powered by the mains supply; therefore, a power circuit is arranged in the sound equipment, and the power circuit converts the mains supply into low-voltage direct current required by the audio circuit; secondly, the sound equipment is in a standby state in the using process; in order to reduce the consumption of electric quantity in the standby process, a low-power consumption standby circuit is arranged in a plurality of manufacturers at present; the application number is as follows: CN2022108539.1, entitled: a low-power consumption standby circuit and a control method thereof; the working state of the power supply circuit is controlled through the low-power consumption standby circuit, and in practical application, when the power supply circuit is awakened, the low-power consumption standby circuit can awaken the power supply circuit by sending a signal to the sound equipment, such as pressing a key and the like; because the current electronic products are very much applied, more electromagnetic waves are radiated in the air; when larger electromagnetic fluctuation occurs around the sound equipment, larger background current is generated in the low-power consumption standby circuit, and a wake-up signal is sent to the power supply circuit; obviously, this does not meet the design objectives and needs improvement.
Disclosure of Invention
The utility model aims to solve the defects of the prior art and provides a low-power consumption isolation standby switch circuit which can avoid triggering caused by peripheral electromagnetic fluctuation and falsely sending a wake-up circuit; convenient to use.
Another object of the utility model is: a power supply circuit is provided, which is connected with the low-power consumption isolation standby switch circuit.
A low power consumption isolated standby switch circuit comprising:
the optocoupler comprises a light emitting part and a light receiving part;
the power supply VCC is grounded through a resistor R1, a light-emitting part and a switching tube Q1 which are connected in series;
the signal receiving end is electrically connected with the control end of the switching tube Q1 and controls the on-off of the switching tube Q1;
the wake-up power supply VDD is grounded through a resistor R5, a resistor R4 and a light receiving part which are connected in series, the wake-up circuit VDD is also connected with a power supply output end through a switch tube Q2, and a control end of the switch tube Q2 is connected with an output end of the resistor R5.
Further, the switching tube Q2 is connected with a voltage stabilizing circuit, the voltage stabilizing circuit includes an NPN type triode Q3, a voltage stabilizing diode ZD and a resistor R6, an output end of the switching tube Q2 is connected with a collector of the triode Q3 and an input end of the resistor R6, an output end of the resistor R6 is connected with an output end of the voltage stabilizing diode ZD and a base electrode of the triode Q3, an emitter of the triode Q3 is connected with a power supply output end, and an input end of the voltage stabilizing diode ZD is grounded.
Preferably, a protection resistor NTC is arranged between the emitter of the triode Q3 and the power supply output terminal.
Further, the switching transistor Q1 is a PNP-type triode Q1, and the switching transistor Q2 is an NPN-type triode Q2.
Further, the signal receiving end is connected with the base electrode of the triode Q1 through a resistor R2, and the signal receiving end is grounded through a resistor R3.
A power supply circuit comprising a primary power supply circuit and a secondary power supply circuit; the main power supply circuit comprises an EMC circuit which is used for being connected with a mains supply, and the EMC circuit is connected with a rectifying circuit and outputs an intermediate voltage power supply to the outside; the EMC circuit is also connected with a full-bridge circuit, a main transformer and a PWM circuit for controlling the on-off of the transformer, the PWM circuit is provided with a main control chip, and a power end of the main control chip is connected with the power output end; the intermediate voltage power supply is connected with an auxiliary transformer, and outputs the wake-up power supply VDD and the power supply VCC to the outside, and the low-power-consumption isolation standby switch circuit is arranged between the main power supply circuit and the auxiliary power supply circuit.
Further, the input terminal of the EMC circuit is connected with a fuse and a thermistor RT1.
Further, the EMC circuit includes a capacitor CX1, a capacitor CX2, and a common mode choke LF2; two ends of the capacitor CX2 are respectively connected with 2 input ends of one side of the common mode choke LF2, and two ends of the capacitor CX1 are respectively connected with 2 output ends of the other side of the common mode choke LF 2.
Further, the output end of the rectifying circuit 2 is grounded through a capacitor C312 and a transformer resistor RV5 connected in parallel.
Compared with the prior art, the utility model has the beneficial effects that: the low-power consumption isolation standby switch circuit is isolated by arranging the optocoupler, so that false triggering can be avoided, and the use is convenient.
Drawings
Fig. 1 is a schematic diagram of a main power circuit of the present utility model.
Fig. 2 is an enlarged schematic view of the mark a in fig. 1.
Fig. 3 is a schematic diagram of a secondary power supply circuit.
Fig. 4 is a schematic diagram of a low power consumption isolated standby switch circuit combined at B of fig. 1 and at the dashed line of fig. 3.
In the figure: 1-EMC circuit; 2-a rectifying circuit; 3-full bridge circuit; 4-voltage stabilizing circuit.
Detailed Description
The technical scheme of the utility model is further described below with reference to fig. 1 to 4 of the accompanying drawings and specific embodiments.
Example 1: referring to fig. 4, a low power consumption isolation standby switch circuit includes:
the optocoupler comprises a light emitting part and a light receiving part;
the power supply VCC is grounded through a resistor R1, a light-emitting part and a switching tube Q1 which are connected in series;
the signal receiving end is electrically connected with the control end of the switching tube Q1 and controls the on-off of the switching tube Q1;
the wake-up power supply VDD is grounded through a resistor R5, a resistor R4 and a light receiving part which are connected in series, the wake-up circuit VDD is also connected with a power supply output end through a switch tube Q2, and a control end of the switch tube Q2 is connected with an output end of the resistor R5.
When the technical scheme is implemented, the switching tube Q2 is used for controlling the wake-up power supply VDD to provide power for a normal working circuit; in the standby state, the switching tube Q2 is in an off state; in the operating state, the switching tube Q2 is in the path. In order to realize the switch control and avoid electromagnetic interference, the technical scheme sets that a wake-up power supply VDD is connected in series with an optocoupler and performs isolation control on a switch tube Q2; when the light emitting device is in standby, the signal receiving end does not have an electric signal or a low-level signal, and the switching tube Q1 is opened, so that a circuit where the light emitting part of the optocoupler is positioned is opened; when the signal receiving end needs to wake up, the signal receiving end sends out a high-level current signal, the switching tube Q1 is a passage, the light emitting part works, meanwhile, the light receiving part also becomes a passage, the circuit where the light receiving part is located is also a passage, the control end of the switching tube Q2 is at a high level, the switching tube Q2 is a passage, and the wake-up power supply VDD supplies power to the outside. In this process, even if the signal receiving terminal is erroneously triggered, since the time of the erroneous triggering is short, the light emitted from the light emitting portion is insufficient to reduce the resistance of the light receiving portion so that it becomes a path, and thus the off state is still maintained.
Further, the switching tube Q2 is connected with a voltage stabilizing circuit 4, the voltage stabilizing circuit 4 includes an NPN type triode Q3, a voltage stabilizing diode ZD and a resistor R6, an output end of the switching tube Q2 is connected with a collector of the triode Q3 and an input end of the resistor R6, an output end of the resistor R6 is connected with an output end of the voltage stabilizing diode ZD and a base of the triode Q3, an emitter of the triode Q3 is connected with a power output end, and an input end of the voltage stabilizing diode ZD is grounded.
The voltage stabilizing diode ZD and the resistor R6 are connected in series, and the voltage stabilizing diode ZD and the resistor R6 form a voltage dividing circuit; the base voltage of the triode Q3 is the output end voltage of the zener diode ZD; transistor Q3 remains on and outputs to the outside. Secondly, the zener diode ZD is arranged, so that the stability of the external output power supply voltage can be kept. When the output voltage exceeds a predetermined value, the zener diode ZD is reverse-broken down.
Preferably, a protection resistor NTC is arranged between the emitter of the triode Q3 and the power supply output terminal.
The resistor NTC is arranged for protecting the whole circuit, and when local temperature overload occurs, the resistance value of the resistor NTC becomes large, and the external output power is reduced.
Further, the switching transistor Q1 is a PNP-type triode Q1, and the switching transistor Q2 is an NPN-type triode Q2.
Adopting a triode Q1 and a triode Q2 as a corresponding switch tube Q1 and a corresponding switch tube Q2; the circuit is simple and the implementation is convenient.
Further, the signal receiving end is connected with the base electrode of the triode Q1 through a resistor R2, and the signal receiving end is grounded through a resistor R3.
The resistor R2 and the resistor R3 form a voltage dividing circuit, and the on voltage of the triode Q1 is increased.
Example 2: see fig. 1, 2, 3; a power supply circuit comprising a primary power supply circuit and a secondary power supply circuit; the main power supply circuit comprises an EMC circuit 1 used for being connected with a mains supply, wherein the EMC circuit 1 is connected with a rectifying circuit 2 and externally outputs an intermediate voltage power supply; the EMC circuit 1 is also connected with a full-bridge circuit 3, a main transformer and a PWM circuit for controlling the on-off of the transformer, the PWM circuit is provided with a main control chip, and the power end of the main control chip is connected with the power output end; the intermediate voltage power supply is connected with an auxiliary transformer, and outputs the wake-up power supply VDD and the power supply VCC to the outside, and the low-power-consumption isolation standby switch circuit is arranged between the main power supply circuit and the auxiliary power supply circuit.
The main power circuit is used for outputting power to the external (working circuit); the EMC circuit 1 and the rectifying circuit 2 are used for converting commercial power into power of the auxiliary power circuit, and the commercial power always supplies power to the auxiliary power circuit when the auxiliary power circuit actually works; the secondary power supply circuit is in a low power consumption state; the secondary power supply circuit provides the power supply VCC and the wake-up power supply VDD required for the low power consumption isolation standby switch circuit. The EMC circuit 1 is connected with the rectifying circuit 2, the full-bridge circuit 3 and the main control chip.
Further, a fuse and a thermistor RT1 are connected to the input terminal of the EMC circuit 1.
A fuse is arranged to prevent the internal current from being too large; the thermistor RT1 is arranged, so that a certain lightning protection effect can be achieved.
Further, the EMC circuit 1 includes a capacitor CX1, a capacitor CX2, and a common mode choke LF2; two ends of the capacitor CX2 are respectively connected with 2 input ends of one side of the common mode choke LF2, and two ends of the capacitor CX1 are respectively connected with 2 output ends of the other side of the common mode choke LF 2.
The ECM circuit is immune to electromagnetic waves present in the environment.
Further, the output end of the rectifying circuit 2 is grounded through a capacitor C312 and a transformer resistor RV5 connected in parallel.
The capacitor C312 and the variable voltage resistor RV5 form an RC filter circuit for filtering the intermediate voltage power supply and keeping the intermediate voltage stable.
The above-described embodiments are merely a few preferred embodiments of the present utility model, and many alternative modifications and combinations of the above-described embodiments will be apparent to those skilled in the art based on the technical solutions of the present utility model and the related teachings of the above-described embodiments.
Claims (9)
1. A low-power consumption isolation standby switch circuit is characterized in that: it comprises the following steps:
the optocoupler comprises a light emitting part and a light receiving part;
the power supply VCC is grounded through a resistor R1, a light-emitting part and a switching tube Q1 which are connected in series;
the signal receiving end is electrically connected with the control end of the switching tube Q1 and controls the on-off of the switching tube Q1;
the wake-up power supply VDD is grounded through a resistor R5, a resistor R4 and a light receiving part which are connected in series, the wake-up circuit VDD is also connected with a power supply output end through a switch tube Q2, and a control end of the switch tube Q2 is connected with an output end of the resistor R5.
2. The low power consumption isolated standby switch circuit of claim 1, wherein: the switching tube Q2 is connected with a voltage stabilizing circuit, the voltage stabilizing circuit comprises an NPN triode Q3, a voltage stabilizing diode ZD and a resistor R6, the output end of the switching tube Q2 is connected with the collector of the triode Q3 and the input end of the resistor R6, the output end of the resistor R6 is connected with the output end of the voltage stabilizing diode ZD and the base of the triode Q3, the emitter of the triode Q3 is connected with the output end of a power supply, and the input end of the voltage stabilizing diode ZD is grounded.
3. The low power consumption isolated standby switch circuit of claim 2, wherein: a protection resistor NTC is arranged between the emitter of the triode Q3 and the power supply output end.
4. A low power consumption isolated standby switch circuit according to claim 1 or 2, wherein: the switch tube Q1 is a PNP type triode Q1, and the switch tube Q2 is an NPN type triode Q2.
5. The low power consumption isolated standby switch circuit of claim 4, wherein: the signal receiving end is connected with the base electrode of the triode Q1 through a resistor R2, and the signal receiving end is grounded through a resistor R3.
6. A power supply circuit comprising a primary power supply circuit and a secondary power supply circuit; the main power supply circuit comprises an EMC circuit which is used for being connected with a mains supply, and the EMC circuit is connected with a rectifying circuit and outputs an intermediate voltage power supply to the outside; the EMC circuit is also connected with a full-bridge circuit, a main transformer and a PWM circuit for controlling the on-off of the transformer, the PWM circuit is provided with a main control chip, and a power end of the main control chip is connected with the power output end; the intermediate voltage power supply is connected with an auxiliary transformer and outputs a wake-up power supply VDD and a power supply VCC outwards, and is characterized in that: a low-power consumption isolation standby switch circuit as claimed in any one of claims 1 to 5 is arranged between the main power supply circuit and the auxiliary power supply circuit.
7. The power supply circuit of claim 6, wherein: the input end of the EMC circuit is connected with a fuse and a thermistor RT1.
8. The power supply circuit of claim 6, wherein: the EMC circuit comprises a capacitor CX1, a capacitor CX2 and a common mode choke LF2; two ends of the capacitor CX2 are respectively connected with 2 input ends of one side of the common mode choke LF2, and two ends of the capacitor CX1 are respectively connected with 2 output ends of the other side of the common mode choke LF 2.
9. The power supply circuit of claim 6, wherein: the output end of the rectifying circuit is grounded through a capacitor C312 and a transformer resistor RV5 which are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223088721.1U CN219041637U (en) | 2022-11-16 | 2022-11-16 | Low-power consumption isolation standby switch circuit and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223088721.1U CN219041637U (en) | 2022-11-16 | 2022-11-16 | Low-power consumption isolation standby switch circuit and power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219041637U true CN219041637U (en) | 2023-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223088721.1U Active CN219041637U (en) | 2022-11-16 | 2022-11-16 | Low-power consumption isolation standby switch circuit and power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219041637U (en) |
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- 2022-11-16 CN CN202223088721.1U patent/CN219041637U/en active Active
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