CN220172844U - Power supply control circuit and power supply system - Google Patents
Power supply control circuit and power supply system Download PDFInfo
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- CN220172844U CN220172844U CN202321685072.5U CN202321685072U CN220172844U CN 220172844 U CN220172844 U CN 220172844U CN 202321685072 U CN202321685072 U CN 202321685072U CN 220172844 U CN220172844 U CN 220172844U
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Abstract
The utility model provides a power supply control circuit and a power supply system. The power supply control circuit is used for controlling the output of a power supply and comprises a first control circuit and an over-temperature protection circuit, wherein the output end of the first control circuit and the output end of the over-temperature protection circuit are respectively connected with the power supply, the first control circuit is used for outputting a control signal to the power supply, and the over-temperature protection circuit is used for changing the voltage value of the control signal output by the first control circuit when the detected temperature exceeds a preset temperature threshold value. The power supply control circuit controls the output of the control signal through the hardware circuit without the participation of a microprocessor, so that the power supply output is controlled in time when the temperature exceeds the limit, and the real-time performance and the reliability are good.
Description
Technical Field
The utility model relates to the technical field of power supply control, in particular to a power supply control circuit and a power supply system.
Background
The current common power supply control method is to control the enabling of a power supply, when the output of a power supply chip is required to be directly controlled based on the temperature detection result of a device or equipment to be detected, a temperature detection circuit is generally used for temperature detection, and a controller compares and judges the temperature detection result and then outputs a corresponding signal to a power supply enabling port, so that the temperature of the device or circuit to be detected is reduced. In this way, if the power supply cannot be controlled in time when the temperature is suddenly changed, the device or equipment is damaged.
Therefore, how to control the power output in time when the temperature exceeds the limit becomes a technical problem to be solved.
Disclosure of Invention
The present utility model has been made in view of the above-described problems. The utility model provides a power supply control circuit and a power supply system, wherein the output of a control signal is controlled through a hardware circuit, so that the power supply output can be controlled in time when the temperature exceeds the limit, the instantaneity is good, and the reliability is high.
The first aspect of the present utility model provides a power supply control circuit, configured to control output of a power supply, where the power supply control circuit includes a first control circuit and an over-temperature protection circuit, the output end of the first control circuit and the output end of the over-temperature protection circuit are respectively connected to the power supply, the first control circuit is configured to output a control signal to the power supply, and the over-temperature protection circuit is configured to change a voltage value of the control signal output by the first control circuit when a detected temperature exceeds a preset temperature threshold.
In one embodiment of the present utility model, the over-temperature protection circuit includes a temperature detection circuit and a second control circuit; the input end of the temperature detection circuit is connected with a working power supply, the output end of the temperature detection circuit is connected with the input end of the second control circuit, and the output end of the second control circuit is connected with the power supply.
In one embodiment of the present utility model, the temperature detection circuit includes a first voltage dividing resistor, a thermistor, a first pull-up resistor, and a comparator; the voltage dividing resistor is connected with the reverse input end of the comparator, one end of the thermistor is connected with the reverse input end of the comparator, the other end of the thermistor is grounded, the forward input end of the comparator is used for inputting a reference voltage corresponding to a preset temperature threshold, one end of the first pull-up resistor is connected with the working power supply, and the other end of the first pull-up resistor is connected with the output end of the comparator.
In one embodiment of the utility model, the temperature detection circuit comprises a temperature detection chip.
In one embodiment of the present utility model, the second control circuit includes: the MOS transistor, NPN triode and second pull-up resistor, the one end of second pull-up resistor respectively with NPN triode's base with MOS transistor's drain electrode is connected, NPN triode's collecting electrode with the power is connected, NPN triode's projecting pole ground, MOS transistor's grid with temperature detection circuit's output is connected, MOS transistor's source ground.
In one embodiment of the present utility model, the first control circuit includes a controller and a first diode, an output pin of the controller is connected to a positive electrode of the first diode, and a negative electrode of the first diode is connected to the power supply.
In one embodiment of the present utility model, the first control circuit further includes a second diode, a second voltage dividing resistor, and a third voltage dividing resistor, the second diode, the second voltage dividing resistor, and the third voltage dividing resistor are connected in series, and the second voltage dividing resistor and the third voltage dividing resistor are connected to the power supply, respectively.
In one embodiment of the present utility model, the over-temperature protection circuit includes a thermistor, and one end of the thermistor is connected to an input pin of the controller.
In one embodiment of the utility model, the controller is an MCU chip.
A second aspect of the utility model provides a power supply system comprising a power supply control circuit as claimed in any one of the first aspects above.
According to the power supply control circuit, the hardware circuit is used for controlling the output of the control signal, and the microprocessor is not needed to participate, so that the power supply output can be controlled in time when the temperature exceeds the limit, the instantaneity is good, and the reliability is high.
Drawings
The above and other objects, features and advantages of the present utility model will become more apparent from the following more particular description of embodiments of the present utility model, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, and not constitute a limitation to the utility model. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 is a schematic block diagram of a power supply control circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic block diagram of a temperature detection circuit according to an embodiment of the utility model;
FIG. 3 is a schematic block diagram of a second control circuit according to an embodiment of the present utility model;
fig. 4 is a schematic block diagram of a power supply control circuit according to another embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, exemplary embodiments according to the present utility model will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present utility model and not all embodiments of the present utility model, and it should be understood that the present utility model is not limited by the example embodiments described herein. Based on the embodiments of the utility model described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the utility model.
First, a power supply control circuit according to an embodiment of the present utility model for controlling an output of a power supply will be described with reference to fig. 1.
As shown in fig. 1, the present utility model proposes a power supply control circuit, where the power supply control circuit includes an over-temperature protection circuit 101 and a first control circuit 102, an output end of the first control circuit 102 and an output end of the over-temperature protection circuit 101 are respectively connected to a power supply 103, the first control circuit 102 is configured to output a control signal to the power supply, and the over-temperature protection circuit 101 is configured to change a voltage value of the control signal output by the first control circuit 102 when a detected temperature exceeds a preset temperature threshold.
Specifically, the power supply may be a power supply chip or a distributed power supply circuit.
It can be understood that, when the power supply is a power supply chip, the output end of the first control circuit 102 and the output end of the over-temperature protection circuit 101 are respectively connected with the enable pin of the power supply 103; when the power supply is a distributed power supply circuit, the output end of the first control circuit 102 and the output end of the over-temperature protection circuit 101 are respectively connected with the control signal input end of the power supply 103.
Specifically, when the voltage of the control signal output by the first control circuit 102 is the first level, the power supply 103 outputs a power supply signal; when the over-temperature protection circuit 101 detects that the temperature exceeds the preset temperature threshold, the level value of the voltage of the control signal is increased or decreased from the first level to the second level, and when the voltage of the control signal output by the first control circuit 102 is the second level, the power supply 103 stops outputting the power supply signal.
Note that, the magnitudes of the first level and the second level may be specifically set according to the actual situation of the power supply, and the magnitudes of the first level and the second level are not specifically limited in this embodiment. When the first level is a high level and the second level is a low level, the over-temperature protection circuit 101 is configured to reduce a voltage value of the control signal output by the first control circuit 102 when the detected temperature exceeds a preset temperature threshold; when the first level is a low level and the second level is a high level, the over-temperature protection circuit 101 is configured to raise the voltage value of the control signal output by the first control circuit 102 when the detected temperature exceeds a preset temperature threshold.
In the following embodiments, the corresponding circuits are described with the first level being high and the second level being low.
In one embodiment of the present utility model, the over-temperature protection circuit includes a temperature detection circuit and a second control circuit; the input end of the temperature detection circuit is connected with a working power supply, the output end of the temperature detection circuit is connected with the input end of the second control circuit, and the output end of the second control circuit is connected with the power supply.
The temperature detection circuit is used for detecting whether the temperature to be detected exceeds a preset temperature threshold value.
As shown in FIG. 2, in one embodiment, the temperature detection circuit may include a first voltage divider resistor R1, a thermistor R NTC A first pull-up resistor R2 and a comparator U1; the voltage dividing resistor R1 is connected with the reverse input end of the comparator U1, and the thermistor R NTC The positive input end of the comparator U1 is used for inputting a reference voltage VREF, one end of the first pull-up resistor R2 is connected with the working power supply, and the other end of the first pull-up resistor R2 is connected with the output end of the comparator U1. The reference voltage VREF may be a voltage corresponding to a preset temperature threshold, and may be provided after being divided by the operating power supply VDD. The operating power supply VDD is used to provide power to the circuit.
Here, the higher the temperature to be measured, the thermistor R NTC The lower the resistance. The first voltage dividing resistor R1 is a fixed resistor and is connected with the thermistor R NTC A voltage divider circuit is formed and used for collecting temperature. The voltage dividing circuit is provided with a sampling end, a temperature acquisition signal obtained by the sampling end is input into the reverse input end of the comparator U1, and a reference voltage VREF is input into the forward input end of the comparator U1. The first voltage dividing resistor R1 and the first pull-up resistor R2 respectively input power supply voltages, and R2 is used as a pull-up resistor for providing a high level. Thus, when the sampling end voltage is lower than the reference voltage VREF, the output end of the comparator is at a high level VDD; when the sample-side voltage is higher than the reference voltage VREF, the comparator outputs a low level, for example, 0 volts. The output end of the comparator U1 is connected with the input end of the second control circuit.
In another specific implementation, the temperature detection circuit may further include a temperature detection chip, where the temperature detection chip is disposed in a device or a chip accessory that needs to monitor temperature.
By way of example, by setting the high temperature limit value of the temperature detection chip, the temperature detection chip is caused to output a high level when it detects that the temperature reaches the high temperature limit value.
As shown in fig. 3, in one embodiment of the present utility model, the second control circuit may include: the MOS transistor Q1, NPN triode Q2 and second pull-up resistor R3, the one end of second pull-up resistor R3 respectively with NPN triode Q2's base with MOS transistor Q1's drain electrode, NPN triode Q2's collecting electrode with the power is connected, NPN triode Q2's projecting pole ground connection, MOS transistor Q1's grid with temperature detection circuit's output is connected, MOS transistor's source ground connection.
Specifically, the MOS transistor Q1 is an NMOS transistor. It should be noted that the NPN transistor may be replaced by a PMOS transistor.
Here, the gate of the MOS transistor Q1 is used for inputting a temperature detection signal output from the temperature detection circuit, and the collector of the NPN transistor Q2 is used for generating a power supply control signal.
In operation, when the temperature does not exceed the preset temperature threshold, the temperature detection signal voltage is VDD, the NMOS Q1 is turned on, the connection point between the MOS transistor Q1 and the NPN transistor Q2 is low, at this time, the NPN transistor Q2 is not turned on, the power control signal is high, and the power supply normally outputs.
When the temperature exceeds the preset temperature threshold, the temperature detection signal voltage is 0V, the NMOS Q1 is not conducted, the connection point of the MOS transistor Q1 and the NPN triode Q2 is at a high level, at the moment, the NPN triode Q2 is conducted, the voltage at the collector of the NPN triode Q2 is pulled down to the ground, and the power supply output is turned off. Thereby realizing the over-temperature protection function.
In the embodiment, the output of the control signal is controlled through the hardware circuit without the participation of a microprocessor, so that the power supply output can be controlled in time when the temperature exceeds the limit, the instantaneity is good, and the reliability is high.
In one embodiment of the present utility model, the first control circuit includes a controller and a first diode, an output pin of the controller is connected to a positive electrode of the first diode, and a negative electrode of the first diode is connected to the power supply.
The controller may be a micro control unit (Microcontroller Unit, MCU) chip, for example.
In this embodiment, the control signal may be output from the MCU chip to the power supply, and the first diode is used to implement unidirectional conduction of the circuit.
In one embodiment of the present utility model, the first control circuit further includes a second diode, a second voltage dividing resistor, and a third voltage dividing resistor, the second diode, the second voltage dividing resistor, and the third voltage dividing resistor are connected in series, and the second voltage dividing resistor and the third voltage dividing resistor are connected to the power supply, respectively.
In this embodiment, the control signal may be input from the outside. Specifically, the externally input control signal is a voltage signal. In order to enable the input control signal to meet the voltage range requirement of the power supply control signal, in the embodiment, the control signal input from the outside can be output to the power supply after being subjected to voltage conversion through the second voltage dividing resistor and the third voltage dividing resistor, and the second diode is also used for realizing unidirectional conduction of the circuit.
In one embodiment of the utility model, one end of the thermistor is connected with an input pin of the controller.
One end of the thermistor is connected with an input pin of the controller, and a temperature acquisition signal is transmitted to the controller, so that the controller can correspondingly control the equipment according to the temperature. For example, when the screen temperature increases, for example, above a preset temperature value but below a temperature threshold, the controller may control operations such as turning down the screen brightness, lowering the MCU main frequency, or turning off unnecessary peripherals to lower the temperature.
A power control circuit according to an embodiment of the present utility model is described below with reference to fig. 4.
In this embodiment, the power supply is the power supply chip U2, so the output end of the power supply control circuit is connected to the enable pin of the power supply chip U2. The output end of the power chip U2 is connected with the MCU and is used for supplying power to the MCU.
Specifically, the MCU in this embodiment is a controller in a vehicle central control, and the temperature to be measured may be the temperature of the MCU.
As shown in fig. 4, the power supply control circuit includes: MCU, first diode D1, second diode D2, second divider resistor R4, third divider resistor R5, second diode D2, second divider resistor R4 and third divider resistor R5 series connection, and second divider resistor R4 and third divider resistor R5 are connected with power chip U2's enable pin EN respectively, and MCU's output pin is connected with first diode D1's positive pole. The power supply control circuit further includes: the MOS transistor Q1, NPN triode Q2 and second pull-up resistor R3, the one end of second pull-up resistor R3 respectively with NPN triode's base Q2 with MOS transistor Q2's drain electrode, NPN triode Q2's collecting electrode with power chip U2's enable pin EN is connected, NPN triode Q2's projecting pole ground connection, MOS transistor Q1's grid with temperature detection circuit's output is connected, MOS transistor's source ground connection. The power supply control circuit further includes a temperature detection circuit (not shown in the figure).
In fig. 4, KL15 represents a vehicle start signal, which is provided by the vehicle when the vehicle starts, and is divided to a proper voltage by a voltage dividing circuit composed of R3 and R2 due to a relatively high voltage, for example, 12v, but R3 is only in the start signal path, and does not divide other paths. D1 and D2 form an OR circuit, namely when any one of the first enabling signal and the second enabling signal is in a low level, the enabling pin of the power chip is pulled down to be powered off, and when one of the enabling pins is uncontrolled (namely not pulled up and not pulled down), any one of the enabling pins is pulled up to keep the enabling pin at a high level to turn on the power chip.
The power-on signal is used as a first enabling signal to enable the input of the enabling pin to be in a high level, and the output of the power chip is turned on. The MCU is used for generating a second control signal for controlling the power lock. When the startup signal is not output, namely 0V, the MCU controls to output a second enabling signal, outputs a high level, for example, the voltage is 3.3V or 5V, and still enables the enabling pin to be high level, so that the output of the power chip is kept, and the output of the power chip is not turned off until the processor MCU controls the second enabling signal to be low after finishing the required work.
Preferably, the MCU is also connected with the temperature sampling end and receives the temperature detection signal, so that the whole power supply control circuit can dynamically adjust the system power consumption according to the temperature under the condition that the normal work of the product is ensured, and when the temperature can not be reduced by software adjustment, the power-off protection is realized when the hardware power-off threshold value is reached.
When the over-temperature protection is triggered, the Q2 can directly pull the enabling pin to the ground to turn off the power supply.
In this embodiment, when no over-temperature occurs, the input of two enable signals is realized through the or circuit, so that various power control modes are realized, and when the over-temperature occurs, the over-temperature protection circuit can directly respond to power failure without software algorithm, without participation of a microprocessor, and has good instantaneity and high reliability.
The embodiment of the utility model also provides a power supply system which comprises a power supply and the power supply control circuit in any embodiment.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present utility model thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the utility model. All such changes and modifications are intended to be included within the scope of the present utility model as set forth in the appended claims.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in order to streamline the utility model and aid in understanding one or more of the various inventive aspects, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the utility model. However, the method of the present utility model should not be construed as reflecting the following intent: i.e., the claimed utility model requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this utility model.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be combined in any combination, except combinations where the features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The utility model may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
The foregoing description is merely illustrative of specific embodiments of the present utility model and the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present utility model. The protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. The power supply control circuit is used for controlling the output of a power supply and is characterized by comprising a first control circuit and an over-temperature protection circuit, wherein the output end of the first control circuit and the output end of the over-temperature protection circuit are respectively connected with the power supply, the first control circuit is used for outputting a control signal to the power supply, and the over-temperature protection circuit is used for changing the voltage value of the control signal output by the first control circuit when the detected temperature exceeds a preset temperature threshold value.
2. The power supply control circuit according to claim 1, wherein the over-temperature protection circuit includes a temperature detection circuit and a second control circuit; the input end of the temperature detection circuit is connected with a working power supply, the output end of the temperature detection circuit is connected with the input end of the second control circuit, and the output end of the second control circuit is connected with the power supply.
3. The power control circuit of claim 2, wherein the temperature detection circuit comprises a first voltage divider resistor, a thermistor, a first pull-up resistor, a comparator; the voltage dividing resistor is connected with the reverse input end of the comparator, one end of the thermistor is connected with the reverse input end of the comparator, the other end of the thermistor is grounded, the forward input end of the comparator is used for inputting a reference voltage corresponding to a preset temperature threshold, one end of the first pull-up resistor is connected with the working power supply, and the other end of the first pull-up resistor is connected with the output end of the comparator.
4. The power control circuit of claim 2, wherein the temperature detection circuit comprises a temperature detection chip.
5. The power control circuit of claim 2, wherein the second control circuit comprises: the MOS transistor, NPN triode and second pull-up resistor, the one end of second pull-up resistor respectively with NPN triode's base with MOS transistor's drain electrode is connected, NPN triode's collecting electrode with the power is connected, NPN triode's projecting pole ground, MOS transistor's grid with temperature detection circuit's output is connected, MOS transistor's source ground.
6. The power control circuit of claim 1, wherein the first control circuit comprises a controller and a first diode, an output pin of the controller is connected to a positive pole of the first diode, and a negative pole of the first diode is connected to the power supply.
7. The power control circuit of claim 6, wherein the first control circuit further comprises a second diode, a second voltage divider resistor, and a third voltage divider resistor, the second diode, the second voltage divider resistor, and the third voltage divider resistor are connected in series, and the second voltage divider resistor and the third voltage divider resistor are connected to the power supply, respectively.
8. The power control circuit of claim 6, wherein the over-temperature protection circuit comprises a thermistor, one end of the thermistor being connected to an input pin of the controller.
9. The power control circuit of claim 6 wherein the controller is an MCU chip.
10. A power supply system, characterized in that the power supply system comprises a power supply and a power supply control circuit as claimed in any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321685072.5U CN220172844U (en) | 2023-06-29 | 2023-06-29 | Power supply control circuit and power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685072.5U CN220172844U (en) | 2023-06-29 | 2023-06-29 | Power supply control circuit and power supply system |
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| CN220172844U true CN220172844U (en) | 2023-12-12 |
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| CN202321685072.5U Active CN220172844U (en) | 2023-06-29 | 2023-06-29 | Power supply control circuit and power supply system |
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