CN214850972U - Output voltage regulating circuit - Google Patents
Output voltage regulating circuit Download PDFInfo
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- CN214850972U CN214850972U CN202121120515.7U CN202121120515U CN214850972U CN 214850972 U CN214850972 U CN 214850972U CN 202121120515 U CN202121120515 U CN 202121120515U CN 214850972 U CN214850972 U CN 214850972U
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Abstract
The utility model provides an output voltage regulating circuit, which relates to the technical field of power supply circuits and can output different power supply voltages; the power supply circuit and the voltage regulation module are included; the voltage regulation module is connected with a first resistor in parallel, and the first resistor is a resistor connected to the feedback end of the power supply chip in the power supply circuit; the voltage regulation module is used for: under the condition that the voltage regulating module is in a disconnected state, the output end of the power supply circuit outputs a first voltage; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage, and the second voltage is smaller than the first voltage.
Description
Technical Field
The utility model relates to a power supply circuit technical field especially relates to an output voltage regulating circuit.
Background
The vehicle-mounted multimedia equipment is a vehicle-mounted information entertainment product arranged in an automobile, and can realize information communication between people and the automobile, between the automobiles and the outside. For example, a user may enjoy music or watch videos through an in-vehicle multimedia device of an automobile after getting on the automobile.
In the application of vehicle-mounted multimedia equipment (vehicle machine), sometimes a power supply is required to output two voltages simultaneously. For example, when the SIM card is used, it is necessary to provide 1.8V and 3.3V voltages for the SIM card at the same time, and then convert different voltages in different application scenarios according to the SIM card protocol. In the prior art, a plurality of power chips can be connected in parallel, and one of the power chips can be selected to output voltage by controlling the on/off of the MOS transistor. However, such a circuit is relatively complex in design and relatively expensive in investment.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists, the embodiment of the utility model provides an output voltage regulating circuit that the design is simple and the input cost is low.
The utility model provides an output voltage regulating circuit, include: a power circuit and a voltage regulation module; the voltage regulation module is connected with a first resistor in parallel, and the first resistor is a resistor connected to the feedback end of the power supply chip in the power supply circuit; the voltage regulation module is used for: under the condition that the voltage regulating module is in a disconnected state, the output end of the power supply circuit outputs a first voltage; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage, and the second voltage is smaller than the first voltage.
According to the utility model provides an output voltage regulating circuit, the voltage regulation module includes NPN type triode, second resistance and control signal end; one end of the second resistor is connected between the feedback end of the power supply chip and the first resistor, the other end of the second resistor is connected with a collector of the NPN type triode, a base of the NPN type triode is connected with the control signal end, and an emitter of the NPN type triode is grounded.
According to the utility model provides an output voltage regulating circuitThe first voltage
The second voltage
The Vref is a voltage value of a feedback end of the power chip, R0 is a resistance value of a third resistor connected between an output end and the feedback end of the power chip, R1 is a resistance value of the first resistor, and R3 is a total resistance value of the first resistor and the second resistor R2 connected in parallel.
According to the utility model provides an output voltage regulating circuit, voltage regulation module still includes: a fourth resistor and a fifth resistor; the fourth resistor is connected between the control signal end and the base electrode of the NPN type triode, and the fifth resistor is connected between the base electrode and the emitting electrode of the NPN type triode.
According to the utility model provides an output voltage regulating circuit, the resistance value of fourth resistance is 10 kilohms.
According to the utility model provides an output voltage regulating circuit, the resistance value of fifth resistance is 50 kilohms.
According to the output voltage regulating circuit provided by the utility model, when the control signal end outputs a low level, the voltage regulating module is in a disconnected state; when the control signal end outputs a high level, the voltage regulating module is in a conducting state.
The utility model provides an output voltage regulating circuit, through connecting voltage regulation module and the first resistance that is connected on the feedback end of power chip in parallel, can realize under the condition that voltage regulation module is in the off-state, make the output of power supply circuit output first voltage; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage smaller than the first voltage. Through the scheme, the change of the resistance of the feedback end can be realized by controlling the on-off of the voltage regulating module, namely the voltage of the feedback end is changed, so that the effect of changing the output voltage of the power supply chip can be achieved, the effect of outputting two voltages by adopting one power supply chip is realized, the circuit design is simplified, and the input cost of the circuit is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit employed in the prior art when outputting a voltage;
fig. 2 is one of the circuit diagrams of the output voltage regulating circuit provided by the present invention;
fig. 3 is a second circuit diagram of the output voltage regulating circuit according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
For the convenience of clear description of the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that words such as "first" and "second" are not used to limit the number and execution sequence.
The output voltage regulating circuit provided by the present invention is described in detail with reference to fig. 1 to 3. It is to be understood that the embodiments of the present invention have been described in terms of some exemplary embodiments for purposes of illustration, and that the invention may be practiced otherwise than as specifically described in the figures.
As shown in fig. 1, the design scheme of a general power circuit adopted by a main board power supply part of a vehicle-mounted multimedia device in the prior art is shown. Wherein, U1 is a power chip, Vin is an input voltage, Vout is an output voltage, a capacitor Cin is an input filter capacitor, a capacitor Cout is an output filter capacitor, an inductor L is a voltage stabilizing inductor, and a resistor R0 and a first resistor R1 are feedback divider resistors; vref is the voltage value of the feedback pin FB input by U1, which is determined by the chip itself, and the power circuit can only output one voltage.
The output voltage is:
when two kinds of voltage need to be provided through the power supply chip, the parallel connection of a plurality of power supply chips can be generally adopted, and one output can be controlled and selected through controlling the on-off of the MOS tube. However, such a circuit is relatively complex in design and requires a plurality of power chips, which results in a high investment cost.
In order to solve the above problem, as shown in fig. 2, the present invention provides an output voltage adjusting circuit. The circuit includes: power supply circuit and voltage regulation module. The voltage regulation module is connected in parallel with a first resistor R1, which is a resistor connected to the feedback terminal FB of the power chip in the power circuit. The voltage regulation module may be to: under the condition that the voltage regulating module is in a disconnected state, the output end of the power supply circuit outputs a first voltage; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage, wherein the second voltage is smaller than the first voltage.
In the embodiment of the present invention, the voltage regulation module is connected in parallel with the first resistor connected to the feedback end of the power chip, so that the output end of the power circuit can output the first voltage when the voltage regulation module is in the off state; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage smaller than the first voltage. Through the scheme, the change of the resistance of the feedback end can be realized by controlling the on-off of the voltage regulating module, namely the voltage of the feedback end is changed, so that the effect of changing the output voltage of the power supply chip can be achieved, the effect of outputting two voltages by adopting one power supply chip is realized, the circuit design is simplified, and the input cost of the circuit is reduced.
Optionally, as shown in fig. 3, the voltage regulating module may include an NPN transistor Q1, a second resistor R2, and a control signal terminal. One end of the second resistor R2 is connected between the feedback end of the power chip and the first resistor R1, the other end of the second resistor R2 is connected with the collector of the NPN-type triode Q1, the base of the NPN-type triode is connected with the control signal end, and the emitter is grounded. The Power _ EN of the control signal end can control the on-off state of the voltage regulating module by outputting different signals. Specifically, when the control signal end outputs a low level, the Q1 is turned off, and the voltage regulation module is in a turned-off state; when the control signal terminal outputs a high level, the Q1 is conducted, and the voltage regulating module is in a conducting state.
When the voltage regulating module is in the off state, only the first resistor R1 can play a feedback role, and therefore, the first voltage
When the voltage regulating module is in the conducting state, R1 is connected in parallel with R2 and plays a role of feedback together, so that the second voltage
Wherein, R0 is the resistance value of the third resistor connected between the output terminal and the feedback terminal of the power chip, and R3 is the total resistance value of the first resistor R1 and the second resistor R2 connected in parallel.
Further, since the voltage value of Vref is determined by the chip itself, i.e. is a fixed value, after the required first voltage V1 and second voltage V2 are determined, the first resistor R1 and second resistor R2 can be deduced reversely. For example, from a first voltage
Can deduce
From a second voltage
Can deduce
And due to
The second resistance can thus be derived
It should be noted that, the NPN transistor Q1 controls the on/off of the path of the second resistor R2, and in order to make the calculation accurate, the transistor with smaller conduction voltage drop needs to be selected for the Q1, so that the conduction ground voltage of R2 can be approximately 0 when the Q1 is turned on.
In the embodiment of the present invention, the on/off of the NPN type triode can be controlled by different signals output from the control signal terminal, so that the voltage regulating module is in different states, that is, when the NPN type triode is turned off, the voltage regulating module is in an off state; when the NPN type triode is conducted, the voltage regulating module is in a conducting state. Therefore, the purpose of changing the voltage of the feedback end is achieved, and the output end outputs two different voltages.
Optionally, with continued reference to fig. 3, the voltage regulation module may further include: and a fourth resistor R4. The fourth resistor R4 is connected between the control signal terminal and the base of the NPN transistor Q1, and can play a role in limiting current when the NPN transistor Q1 is turned on, thereby avoiding the problem that the NPN transistor is burned out due to excessive current. For example, the resistance of the fourth resistor R4 may be 10 kilo-ohms.
Optionally, with continued reference to fig. 3, the voltage regulation module may further include: and a fifth resistor R5. The fifth resistor R5 is connected between the base and the emitter of the NPN transistor Q1, and can play a role in protection, so as to ensure that the Q1 is in an off state when the system is powered on, for example, the resistance value of the fifth resistor R5 may be 50 kohm.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. An output voltage regulating circuit, comprising a power supply circuit, characterized by further comprising: a voltage regulation module; the voltage regulation module is connected with a first resistor in parallel, and the first resistor is a resistor connected to the feedback end of the power supply chip in the power supply circuit;
the voltage regulation module is used for: under the condition that the voltage regulating module is in a disconnected state, the output end of the power supply circuit outputs a first voltage; and under the condition that the voltage regulating module is in a conducting state, the output end outputs a second voltage, and the second voltage is smaller than the first voltage.
2. The output voltage regulating circuit according to claim 1, wherein the voltage regulating module comprises an NPN transistor, a second resistor, and a control signal terminal; one end of the second resistor is connected between the feedback end of the power supply chip and the first resistor, the other end of the second resistor is connected with a collector of the NPN type triode, a base of the NPN type triode is connected with the control signal end, and an emitter of the NPN type triode is grounded.
3. The output voltage regulation circuit of claim 2,
the first voltage
The second voltage
The Vref is a voltage value of a feedback end of the power chip, R0 is a resistance value of a third resistor connected between an output end and the feedback end of the power chip, R1 is a resistance value of the first resistor, and R3 is a total resistance value of the first resistor and the second resistor R2 connected in parallel.
4. The output voltage regulation circuit of claim 2, wherein the voltage regulation module further comprises: a fourth resistor and a fifth resistor; the fourth resistor is connected between the control signal end and the base electrode of the NPN type triode, and the fifth resistor is connected between the base electrode and the emitting electrode of the NPN type triode.
5. The output voltage regulation circuit of claim 4, wherein the fourth resistor has a resistance of 10 kilo-ohms.
6. The output voltage regulation circuit of claim 4, wherein the resistance value of the fifth resistor is 50 kilo-ohms.
7. The output voltage regulating circuit according to any one of claims 2 to 6, wherein the voltage regulating module is in an off state when the control signal terminal outputs a low level; when the control signal end outputs a high level, the voltage regulating module is in a conducting state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121120515.7U CN214850972U (en) | 2021-05-24 | 2021-05-24 | Output voltage regulating circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121120515.7U CN214850972U (en) | 2021-05-24 | 2021-05-24 | Output voltage regulating circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296501A (en) * | 2021-12-23 | 2022-04-08 | 深圳市元征科技股份有限公司 | Power supply voltage adjusting system |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296501A (en) * | 2021-12-23 | 2022-04-08 | 深圳市元征科技股份有限公司 | Power supply voltage adjusting system |
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