CN213637538U - Switching power supply circuit and electronic equipment - Google Patents
Switching power supply circuit and electronic equipment Download PDFInfo
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- CN213637538U CN213637538U CN202022525873.8U CN202022525873U CN213637538U CN 213637538 U CN213637538 U CN 213637538U CN 202022525873 U CN202022525873 U CN 202022525873U CN 213637538 U CN213637538 U CN 213637538U
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Abstract
The utility model discloses a switching power supply circuit and electronic equipment, this switching power supply circuit includes: the circuit comprises a switching power supply, a voltage stabilizing chip, a first resistor, a second resistor and a third resistor. So set up, when being in standby state, the first end and the second end of the first controllable switch of automatic control switch on, first resistance and third resistance series connection become the second resistance and parallelly connected with first resistance and establish ties with the third resistance again, and resistance reduces in the circuit for the voltage grow of steady voltage chip reference end, switching power supply receive the feedback current grow of steady voltage chip, thereby reduces the duty cycle automatically, reduces output voltage. And further, the voltage difference between the output voltage and the conversion chip is greatly reduced, so that the power consumption of the conversion chip is reduced.
Description
Technical Field
The utility model relates to the technical field of household appliances, concretely relates to switching power supply circuit and electronic equipment.
Background
Along with the improvement of living standard of people, many intelligent electrical appliances have gone into people's life. When a user finishes using a domestic electric appliance, the power supply of the electric appliance is usually not completely disconnected for convenience of starting the electric appliance, but the electric appliance is in a standby state.
When the electric appliance works normally, the switching power supply of the electric appliance firstly converts commercial power into proper direct current, and then the conversion chip converts the direct current voltage converted by the switching power supply into the working voltage of the electric appliance controller. Because the controller can work normally when the electric appliance is in standby state, the conversion chip for supplying power to the controller can be in a working state. In standby mode, extra power consumption is inevitably generated because the conversion chip is in operation. So that the product requirements at the time of export to a low power consumption area cannot be guaranteed.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in the problem that the additional power consumption can be produced to the conversion voltage chip during the product standby that exists among the prior art. Thereby providing a switching power supply circuit and an electronic device.
In order to achieve the above object, an embodiment of the present invention provides a switching power supply circuit, which includes: the switching power supply is provided with an output port and a feedback port; the output port is used for generating an output voltage; the feedback port is used for adjusting the output voltage according to an input signal; the voltage stabilizing chip is provided with a first end, a second end and a reference end, the voltage between the reference end and the second end is constant, and the first end is connected with a feedback port of the switching power supply; a first end of the first resistor is connected with an output port of the switching power supply, and a second end of the first resistor is connected with a reference end of the voltage stabilizing chip; a first end of the second resistor is connected with an output port of the switching power supply through a first controllable switch, and a second end of the second resistor is connected with a reference end of the voltage stabilizing chip; and a first end of the third resistor is connected with the reference end of the voltage stabilizing chip, and a second end of the third resistor is connected with the second end of the voltage stabilizing chip.
Optionally, the second terminal of the voltage stabilization chip is connected to a ground reference.
Optionally, a first end of the first controllable switch is connected to an output port of the switching power supply, a second end of the first controllable switch is connected to the first resistor, and a control end of the first controllable switch is configured to receive a control signal.
Optionally, the switching power supply circuit further includes:
and a first end of the second controllable switch is connected with the control end of the first controllable switch, a second end of the second controllable switch is grounded, and the control end of the second controllable switch is used for receiving the control signal.
Optionally, the switching power supply circuit further includes: and one end of the fourth resistor is connected with the first end of the second controllable switch, and the other end of the fourth resistor is connected with the control end of the first controllable switch.
Optionally, the switching power supply circuit further includes:
and one end of the fifth resistor is connected with the second end of the second controllable switch, and the other end of the fifth resistor is connected with the control end of the second controllable switch.
Optionally, the switching power supply circuit further includes:
a first end of the third controllable switch is connected with the control end of the second controllable switch, a second end of the third controllable switch is grounded, and the control end of the third controllable switch is used for receiving the control signal;
and the power supply is connected with the first end of the third controllable switch through a sixth resistor.
Optionally, the switching power supply circuit further includes:
and one end of the seventh resistor is connected with the control end of the second controllable switch, and the second end of the seventh resistor is connected with the first end of the third controllable switch.
Optionally, the switching power supply circuit further includes:
and one end of the eighth resistor is connected with the second end of the third controllable switch, and the other end of the eighth resistor is connected with the control end of the third controllable switch.
Optionally, the switching power supply circuit further includes:
and one end of the ninth resistor is connected with the control end of the third controllable switch, and the other end of the ninth resistor is connected with a control port for outputting a control signal.
Optionally, the first controllable switch, the second controllable switch and the third controllable switch of the switching power supply circuit may be triodes.
The embodiment of the utility model provides a still provide an electronic equipment, this electronic equipment includes: the switching power supply circuit and the conversion chip according to any one of the embodiments; the conversion chip is connected with an output port of the switching power supply.
Compared with the prior art, the utility model, have following advantage:
1. the embodiment of the utility model provides a switching power supply circuit, this switching power supply circuit includes: the switching power supply is provided with an output port and a feedback port; the output port is used for generating an output voltage; the feedback port is used for adjusting the output voltage according to an input signal; the voltage stabilizing chip is provided with a first end, a second end and a reference end, the voltage between the reference end and the second end is constant, and the first end is connected with a feedback port of the switching power supply; a first end of the first resistor is connected with an output port of the switching power supply, and a second end of the first resistor is connected with a reference end of the voltage stabilizing chip; a first end of the second resistor is connected with an output port of the switching power supply through a first controllable switch, and a second end of the second resistor is connected with a reference end of the voltage stabilizing chip; and a first end of the third resistor is connected with the reference end of the voltage stabilizing chip, and a second end of the third resistor is connected with the second end of the voltage stabilizing chip.
So set up, when being in standby state, the first end and the second end of the first controllable switch of automatic control switch on, first resistance and third resistance series connection become the second resistance and parallelly connected with first resistance and establish ties with the third resistance again, and resistance reduces in the circuit for the voltage grow of steady voltage chip reference end, switching power supply receive the feedback current grow of steady voltage chip, thereby reduces the duty cycle automatically, reduces output voltage. And further, the voltage difference between the output voltage and the conversion chip is greatly reduced, so that the power consumption of the conversion chip is reduced.
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, and obviously, the drawings in the following description are some embodiments of the present invention, and for a worker in the field, without creative efforts, other drawings can be obtained according to the drawings.
Fig. 1 is a schematic diagram of a switching power supply circuit according to an embodiment of the present invention.
Reference numerals:
a first resistor R1; a second resistor R2; a third resistor R3; a fourth resistor R4; a fifth resistor R5; a sixth resistor R6; a seventh resistor R7; an eighth resistor R8; a ninth resistor R9;
a first controllable switch Q1; a second controllable switch Q2; a third controllable switch Q3;
a voltage stabilization chip U1; a power supply VCC 1;
an output port SW; a feedback port FB.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary workers in the field without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases for ordinary workers in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Along with the improvement of living standard of people, many intelligent electrical appliances have gone into people's life. When a user finishes using a domestic electric appliance, the power supply of the electric appliance is usually not completely disconnected for convenience of starting the electric appliance, but the electric appliance is in a standby state. When the electric appliance works normally, the switching power supply of the electric appliance firstly converts commercial power into proper direct current, and then the conversion chip converts the direct current voltage converted by the switching power supply into the working voltage of the electric appliance controller. Because the controller can work normally when the electric appliance is in standby state, the conversion chip for supplying power to the controller can be in a working state. In standby mode, extra power consumption is inevitably generated because the conversion chip is in operation. So that the product requirements at the time of export to a low power consumption area cannot be guaranteed.
The utility model provides a pair of switching power supply circuit and electronic equipment are used for solving the problem that the product standby time conversion voltage chip that exists can produce extra consumption among the prior art.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a switching power supply circuit, which includes: the circuit comprises a switching power supply, a first controllable switch Q1, a voltage stabilizing chip U1, a second resistor R2, a first resistor R1 and a third resistor R3.
The embodiment of the utility model provides an in, switching power supply is provided with input port, output port SW and feedback port FB. The input end of the switching power supply is connected with mains supply, the output port SW is used for converting the mains supply into direct-current voltage suitable for a product, and the feedback port FB of the product is used for adjusting the output voltage according to an input signal. In this embodiment, the feedback port FB may be used to receive a feedback current from the regulator chip U1. The operating voltage required by the controller inside the product is usually provided by a conversion chip, and the input end of the conversion chip is connected with the output port SW of the switching power supply.
The voltage stabilizing chip U1 is provided with a first end, a second end and a reference end, and the voltage between the reference end and the second end is constant. The first end of the voltage stabilizing chip U1 is connected with the feedback port FB of the switching power supply, the first end of the first resistor R1 is connected with the output port SW of the switching power supply, and the second end of the first resistor R1 is connected with the reference end of the voltage stabilizing chip U1. A first end of the second resistor R2 is connected to the output port SW of the switching power supply through the first controllable switch Q1, and a second end of the second resistor R2 is connected to the reference end of the regulator chip U1. The first end of the third resistor R3 is connected with the reference end of the voltage stabilizing chip U1, and the second end is connected with the second end of the voltage stabilizing chip U1. Since the second terminal of the regulator chip is a common terminal for input and output for providing a reference level point, in this embodiment, the second terminal of the regulator chip U1 may be connected to a ground reference.
By means of the arrangement, when the power supply is in a standby state, the first end and the second end of the first controllable switch Q1 are automatically controlled to be conducted through a control signal, the first resistor R1 is connected with the third resistor R3 in series to be changed into the second resistor R2 which is connected with the first resistor R1 in parallel and then connected with the third resistor R3 in series, the resistance in the circuit is reduced, the voltage of the reference end of the voltage stabilizing chip U1 is increased, the feedback current received by the switching power supply to the voltage stabilizing chip U1 is increased, the duty ratio is automatically reduced, and the output voltage is reduced. And further, the voltage difference between the output voltage and the conversion chip is greatly reduced, so that the power consumption of the conversion chip is reduced.
Optionally, in the embodiment of the present invention, the switching power supply circuit further includes a second controllable switch Q2, the first end of the second controllable switch Q2 is connected to the control terminal of the first controllable switch Q1, the second end of the second controllable switch Q2 is grounded, and the control terminal of the second controllable switch Q2 is used for receiving a control signal.
Specifically, the first controllable switch Q1 is a PNP transistor. When the circuit is in a standby state, the first end and the second end of the second controllable switch Q2 are automatically controlled to be conducted through a control signal, and the second end of the second switch resistor is grounded, so that the first end and the second end of the first controllable switch Q1 are conducted, the series connection of the first resistor R1 and the third resistor R3 is changed into the parallel connection of the second resistor R2 and the first resistor R1 and then the series connection of the second resistor R3 and the third resistor R1, the resistance in the circuit is reduced, the voltage of the reference end of the voltage stabilizing chip U1 is increased, the feedback current received by the switching power supply to the voltage stabilizing chip U1 is increased, the duty ratio is automatically reduced, and the output voltage is reduced.
Optionally, in some embodiments of the present invention, the switching power supply circuit may further include a second resistor R2, one end of a fourth resistor R4 is connected to the first end of the second controllable switch Q2, and the other end of the fourth resistor R4 is connected to the control end of the first controllable switch Q1. A fifth resistor R5 may be further included, one end of the fifth resistor R5 is connected to the second end of the second controllable switch Q2, and the other end of the fifth resistor R5 is connected to the control end of the second controllable switch Q2.
In the embodiment of the present invention, the switching power supply circuit may further include a third controllable switch Q3 and a power supply VCC 1. A first terminal of the third controllable switch Q3 is connected to a control terminal of the second controllable switch Q2, a second terminal of the third controllable switch Q3 is connected to ground, and a control terminal of the third circuit is configured to receive a control signal. The power supply VCC1 is connected to the first terminal of the third switch through a sixth resistor R6. In the present embodiment, the third controllable switch Q3 is exemplified as an NPN transistor.
Specifically, when the first controllable switch Q1 is a PNP transistor and the second controllable switch Q2 is an NPN transistor, the first terminal and the second terminal of the third controllable switch Q3 are automatically controlled to be turned off by a control signal when the first controllable switch Q1 is in a standby state, so that the power supply VCC1 forms a loop with the sixth resistor R6, the fifth resistor R5 and the reference, and thus the control terminal of the second controllable switch Q2 inputs a high level and the first terminal and the second terminal of the second controllable switch Q2 are turned on. Because the second end of the second switch resistor is grounded, the first end and the second end of the first controllable switch Q1 are conducted, so that the first resistor R1 and the third resistor R3 are connected in series to be changed into the second resistor R2 which is connected with the first resistor R1 in parallel and then connected with the third resistor R3 in series, the resistance in the circuit is reduced, the voltage of the reference end of the voltage stabilizing chip U1 is increased, the feedback current received by the switch power supply to the voltage stabilizing chip U1 is increased, the duty ratio is automatically reduced, and the output voltage is reduced.
Of course, in the embodiment of the present invention, the third controllable switch Q3 may be one of a triode and a MOS transistor, and those skilled in the art may change the type of the third controllable switch Q3 according to actual conditions, and the embodiment of the present invention does not limit this, and it is enough to achieve the same technical effect.
Optionally, in some embodiments of the present invention, the switching power supply circuit further includes: a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9.
One end of the seventh resistor R7 is connected to the control terminal of the second controllable switch Q2, and the second end is connected to the first end of the third controllable switch Q3.
One end of the eighth resistor R8 is connected to the second end of the third controllable switch Q3, and the other end is connected to the control end of the third controllable switch Q3.
One end of the ninth resistor R9 is connected to the control end of the third controllable switch Q3, and the other end is connected to a control port for outputting a control signal.
Example 2
The embodiment of the utility model provides a still provide an electronic equipment, this electronic equipment includes any one of the above-mentioned embodiment switching power supply circuit, conversion chip and rely on the conversion chip power supply and the product controller of work. The input end of the conversion chip is connected with the output port SW of the switch power supply in the switch power supply circuit.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (12)
1. A switching power supply circuit, comprising:
the switching power supply is provided with an output port and a feedback port; the output port is used for generating an output voltage; the feedback port is used for adjusting the output voltage according to an input signal;
the voltage stabilizing chip is provided with a first end, a second end and a reference end, the voltage between the reference end and the second end is constant, and the first end is connected with a feedback port of the switching power supply;
a first end of the first resistor is connected with an output port of the switching power supply, and a second end of the first resistor is connected with a reference end of the voltage stabilizing chip;
a first end of the second resistor is connected with an output port of the switching power supply through a first controllable switch, and a second end of the second resistor is connected with a reference end of the voltage stabilizing chip;
and a first end of the third resistor is connected with the reference end of the voltage stabilizing chip, and a second end of the third resistor is connected with the second end of the voltage stabilizing chip.
2. The switching power supply circuit according to claim 1, wherein the second terminal of the regulator chip is connected to a ground reference.
3. The switching power supply circuit according to claim 1,
the first end of the first controllable switch is connected with an output port of the switching power supply, the second end of the first controllable switch is connected with the first resistor, and the control end of the first controllable switch is used for receiving a control signal.
4. The switching power supply circuit according to claim 3, further comprising:
and a first end of the second controllable switch is connected with the control end of the first controllable switch, a second end of the second controllable switch is grounded, and the control end of the second controllable switch is used for receiving the control signal.
5. The switching power supply circuit according to claim 4, further comprising:
and one end of the fourth resistor is connected with the first end of the second controllable switch, and the other end of the fourth resistor is connected with the control end of the first controllable switch.
6. The switching power supply circuit according to claim 4, further comprising:
and one end of the fifth resistor is connected with the second end of the second controllable switch, and the other end of the fifth resistor is connected with the control end of the second controllable switch.
7. The switching power supply circuit according to claim 5 or 6, further comprising:
a first end of the third controllable switch is connected with the control end of the second controllable switch, a second end of the third controllable switch is grounded, and the control end of the third controllable switch is used for receiving the control signal;
and the power supply is connected with the first end of the third controllable switch through a sixth resistor.
8. The switching power supply circuit according to claim 7, further comprising:
and one end of the seventh resistor is connected with the control end of the second controllable switch, and the second end of the seventh resistor is connected with the first end of the third controllable switch.
9. The switching power supply circuit according to claim 7, further comprising:
and one end of the eighth resistor is connected with the second end of the third controllable switch, and the other end of the eighth resistor is connected with the control end of the third controllable switch.
10. The switching power supply circuit according to claim 8 or 9, further comprising:
and one end of the ninth resistor is connected with the control end of the third controllable switch, and the other end of the ninth resistor is connected with a control port for outputting a control signal.
11. The switching power supply circuit according to claim 8 or 9, wherein the first controllable switch, the second controllable switch and the third controllable switch are transistors.
12. An electronic device, comprising: the switching power supply circuit and the conversion chip according to any one of claims 1 to 11; the conversion chip is connected with an output port of the switching power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022525873.8U CN213637538U (en) | 2020-11-04 | 2020-11-04 | Switching power supply circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022525873.8U CN213637538U (en) | 2020-11-04 | 2020-11-04 | Switching power supply circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN213637538U true CN213637538U (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022525873.8U Active CN213637538U (en) | 2020-11-04 | 2020-11-04 | Switching power supply circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313814A (en) * | 2022-09-03 | 2022-11-08 | 迈思普电子股份有限公司 | Simple output voltage conversion circuit |
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- 2020-11-04 CN CN202022525873.8U patent/CN213637538U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313814A (en) * | 2022-09-03 | 2022-11-08 | 迈思普电子股份有限公司 | Simple output voltage conversion circuit |
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