CN216157950U - Switch control circuit, system and heat dissipation equipment - Google Patents
Switch control circuit, system and heat dissipation equipment Download PDFInfo
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- CN216157950U CN216157950U CN202122168002.XU CN202122168002U CN216157950U CN 216157950 U CN216157950 U CN 216157950U CN 202122168002 U CN202122168002 U CN 202122168002U CN 216157950 U CN216157950 U CN 216157950U
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Abstract
The utility model discloses a switch control circuit, a switch control system and heat dissipation equipment. Wherein, the switch control circuit includes: the temperature detection module is electrically connected with an external power supply and is used for detecting a temperature parameter and generating a temperature electric signal according to the temperature parameter; the voltage setting module is electrically connected with the temperature detection module and is used for setting a preset voltage; and the switch control module is respectively and electrically connected with the voltage setting module, the external power supply and the power supply end of the fan and is used for generating a feedback signal. According to the utility model, the voltage setting module generates a control signal according to the preset voltage, the temperature electric signal and the feedback signal, and the switch control module is switched on or off according to the control signal, so that the function of automatically switching on and off the power supply by the switch control circuit according to the temperature of the power supply equipment is realized.
Description
Technical Field
The utility model relates to the field of switch circuits, in particular to a switch control circuit, a switch control system and heat dissipation equipment.
Background
With the continuous development of electronic technology, power supplies in electronic products are also widely used in different fields. Because the switching power supply has large power, small volume and large heat productivity, the heat dissipation of the switching power supply also becomes an important research object for technical researchers. With the increasing development of semiconductor technology, the efficiency of switching power supplies is higher and higher, and the heat dissipation of the power supplies is improved to some extent, but the heat problem cannot be solved completely from the device materials, so that the auxiliary heat dissipation of the switching power supplies is necessary. There are many auxiliary heat dissipation methods for the switching power supply, and one of the common methods is air cooling heat dissipation.
In the related art, a fan for air-cooling heat dissipation directly starts to operate after power is turned on, which causes an increase in no-load power consumption and noise generation. Therefore, in the case that the fan needs to have low idle loss or the requirement for the noise influence on the surrounding environment of the fan is strict, the circuit that the power supply device directly supplies power to the heat dissipation fan is no longer applicable.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a switch control circuit which can realize the function of automatically switching on and off a power supply according to the temperature of power supply equipment.
The utility model also provides a switch control system with the switch control circuit and heat dissipation equipment with the switch control system.
The switch control circuit according to the embodiment of the first aspect of the utility model is applied to a fan, and comprises:
the temperature detection module is electrically connected with an external power supply and is used for detecting a temperature parameter and generating a temperature electric signal according to the temperature parameter;
the voltage setting module is electrically connected with the temperature detection module and is used for setting a preset voltage;
the switch control module is respectively and electrically connected with the voltage setting module, an external power supply and a power supply end of the fan, and is used for generating a feedback signal;
the voltage setting module is used for generating a control signal according to the preset voltage, the temperature electric signal and the feedback signal; the switch control module is used for switching on or off according to the control signal.
The switch control circuit according to the embodiment of the utility model has at least the following beneficial effects: the temperature detection module detects temperature parameters of power supply equipment to be detected, a temperature electric signal is generated according to the temperature parameters, the voltage setting module sets a preset voltage, the switch control module generates a feedback signal acting on the voltage setting module according to the conduction state of the switch control module, the voltage setting module generates a control signal according to the preset voltage, the temperature electric signal and the feedback signal, and the conduction state of the switch control module is controlled, so that the function that the switch control circuit automatically switches the power supply according to the temperature of the power supply equipment is achieved.
According to some embodiments of the utility model, the temperature detection module comprises:
one end of the temperature sampling resistor is electrically connected with the voltage setting module;
one end of the first resistor is electrically connected with an external power supply, and the other end of the first resistor is electrically connected with the other end of the temperature sampling resistor;
and one end of the second resistor is electrically connected with the voltage setting module and the connection node of the temperature sampling resistor, and the other end of the second resistor is grounded.
According to some embodiments of the utility model, the voltage setting module comprises:
the first port of the reference voltage chip is used for being electrically connected with the temperature detection module and the switch control module respectively, the second port of the reference voltage chip is used for being grounded, and the third port of the reference voltage chip is used for being electrically connected with the switch control module.
According to some embodiments of the utility model, the switch control module comprises:
the switch unit is used for being electrically connected with the voltage setting module, an external power supply and a power supply end of the fan respectively;
one end of the third resistor is used for being electrically connected with the voltage setting module, and the other end of the third resistor is used for being electrically connected with an external power supply;
and one end of the fourth resistor is used for being electrically connected with the voltage setting module and the connection node of the third resistor, and the other end of the fourth resistor is used for being electrically connected with the switch unit.
According to some embodiments of the utility model, the switching unit comprises:
the emitter of the voltage-current control element is electrically connected with an external power supply, the collector of the voltage-current control element is electrically connected with the power supply end of the fan, and the base of the voltage-current control element is used for being electrically connected with the other end of the fourth resistor;
one end of the fifth resistor is used for being electrically connected with the voltage setting module, and the other end of the fifth resistor is used for being electrically connected with the power supply end of the fan.
According to some embodiments of the utility model, the voltage control flow element comprises a triode.
A switch control system according to an embodiment of the second aspect of the present invention includes:
a switch control circuit according to an embodiment of the above first aspect of the utility model;
an external power source electrically connected to the switch control circuit.
The switch control system provided by the embodiment of the utility model at least has the following beneficial effects: by adopting the switch control circuit, the switch control system realizes the function of automatically switching on and off the power supply according to the temperature of the power supply equipment, and solves the problem of no-load power consumption.
The heat dissipating device according to the embodiment of the third aspect of the present invention includes the switch control system according to the embodiment of the second aspect of the present invention and the fan.
The heat dissipation device provided by the embodiment of the utility model at least has the following beneficial effects: by adopting the switch control system, the heat dissipation device realizes the function of automatically switching on and off the power supply according to the temperature of the power supply device, and solves the problems of no-load power consumption and no-load noise.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the following figures and examples, in which:
FIG. 1 is a block diagram of a switch control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the switch control circuit of the present invention.
Reference numerals:
the temperature sensing module comprises an external power supply 100, a temperature detection module 200, a voltage setting module 300, a switch control module 400, a switch unit 410, a fan 500, a temperature sampling resistor RT, a reference voltage chip U1, a voltage control current element Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly defined, terms such as set, mounted, connected, electrically connected, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, the switch control circuit according to the embodiment of the present invention includes a temperature detection module 200, a voltage setting module 300, and a switch control module 400. The temperature detection module 200 is electrically connected to the external power source 100, and the temperature detection module 200 is configured to set a preset temperature and detect a temperature parameter, and generate a temperature electrical signal according to the preset temperature and the temperature parameter. The voltage setting module 300 is electrically connected to the temperature detecting module 200, and the voltage setting module 300 is configured to set a preset voltage and generate a control signal according to the preset voltage and the temperature electrical signal. The switch control module 400 is electrically connected to the voltage setting module 300, the external power source 100 and the power supply terminal of the fan 500, respectively, and the switch control module 400 is configured to be turned on or off according to a control signal.
Specifically, the temperature detection module 200 is electrically connected to the external power source 100 and the voltage setting module 300, the voltage setting module 300 is electrically connected to the temperature detection module 200 and the switch control module 400, and the switch control module 400 is electrically connected to the external power source 100, the voltage setting module 300 and the power supply terminal of the fan 500. First, the temperature detection module 200 detects a temperature parameter of the power device to be detected and generates a corresponding temperature electrical signal in real time, and the voltage setting module 300 sets a preset voltage and compares the preset voltage with the temperature electrical signal provided by the temperature detection module 200. When the voltage corresponding to the temperature electrical signal is lower than the preset voltage, the voltage setting module 300 is in the off state and does not send any control signal; when the voltage corresponding to the temperature electrical signal is greater than or equal to the preset voltage, the voltage setting module 300 is turned on and sends a turned-on control signal to the switch control module 400, so that the switch control module 400 is turned on and the external power supply 100 starts to supply power to the fan 500. Then, the switch control module 400 sends a feedback signal to the voltage setting module 300 after being in the on state, and the voltage setting module 300 compares the preset voltage with the temperature electrical signal and the feedback signal. When the voltage formed by the temperature electrical signal and the feedback signal is greater than or equal to the preset voltage, the voltage setting module 300 is continuously turned on and continuously sends a conducting control signal to the switch control module 400; when the voltage formed by the temperature electrical signal and the feedback signal is less than the preset voltage, the voltage setting module 300 is turned off, so that the on-off control signal is stopped, the switch control module 400 is turned off, and the external power supply 100 stops supplying power to the fan 500.
According to the switch control circuit provided by the embodiment of the utility model, the temperature detection module 200 is used for detecting the temperature parameter of the power supply equipment to be detected and generating the temperature electric signal according to the temperature parameter, the voltage setting module 300 is used for setting a preset voltage, the switch control module 400 is used for generating the feedback signal acting on the voltage setting module 300 according to the conduction state of the switch control module, the voltage setting module 300 is used for generating the control signal according to the preset voltage, the temperature electric signal and the feedback signal, and further controlling the conduction state of the switch control module 400, so that the function of automatically switching the power supply by the switch control circuit according to the temperature of the power supply equipment is realized.
As shown in FIG. 2, in some embodiments of the utility model, the temperature sensing module 200 includes a temperature sampling resistor RT, a first resistor R1, and a second resistor R2. One end of the temperature sampling resistor RT is used for being electrically connected with the voltage setting module 300, one end of the first resistor R1 is electrically connected with the external power supply 100, the other end of the first resistor R1 is electrically connected with the other end of the temperature sampling resistor RT, one end of the second resistor R2 is electrically connected with a connection node of the voltage setting module 300 and the temperature sampling resistor RT, and the other end of the second resistor R2 is grounded.
Specifically, two ends of the first resistor R1 are electrically connected to the external power source 100 and one end of the temperature sampling resistor RT, the other end of the temperature sampling resistor RT is electrically connected to the voltage setting module 300 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The temperature sampling resistor RT detects temperature parameters of the power device to be detected, and changes its resistance value to reflect the currently detected temperature, thereby affecting the voltage output to the voltage setting module 300.
As shown in FIG. 2, in some embodiments of the utility model, the voltage setting module 300 includes a reference voltage chip U1. The first port of the reference voltage chip U1 is used for being electrically connected with the temperature detection module 200 and the switch control module 400 respectively, the second port of the reference voltage chip U1 is grounded, and the third port of the reference voltage chip U1 is used for being electrically connected with the switch control module 400.
Specifically, the reference voltage chip U1 sets a preset voltage, the second port of the reference voltage chip U1 and the third port of the reference voltage chip U1 are opened when the voltage of the first port of the reference voltage chip U1 is less than the preset voltage, and the second port of the reference voltage chip U1 and the third port of the reference voltage chip U1 are closed when the voltage of the first port of the reference voltage chip U1 is greater than or equal to the preset voltage.
As shown in fig. 2, in some embodiments of the utility model, the switch control module 400 includes a switch unit 410, a third resistor R3 and a fourth resistor R4. The switch unit 410 is configured to be electrically connected to the power supply terminals of the voltage setting module 300, the external power source 100 and the fan 500, respectively, one end of the third resistor R3 is configured to be electrically connected to the voltage setting module 300, the other end of the third resistor R3 is configured to be electrically connected to the external power source 100, one end of the fourth resistor R4 is configured to be electrically connected to a connection node between the voltage setting module 300 and the third resistor R3, and the other end of the fourth resistor R4 is configured to be electrically connected to the switch unit 410.
Specifically, two ends of the third resistor R3 are electrically connected to the external power source 100 and the voltage setting module 300, two ends of the fourth resistor R4 are electrically connected to the switch unit 410 and the connection node of the third resistor R3 and the voltage setting module 300, respectively, and the switch unit 410 is electrically connected to the external power source 100, the voltage setting module 300, the fourth resistor R4 and the power supply terminal of the fan 500, respectively. The third resistor R3 and the fourth resistor R4 are used for voltage division.
As shown in fig. 2, in some embodiments of the utility model, the switching unit 410 includes a voltage control current element Q1 and a fifth resistor R5. The emitter of the voltage-controlled current element Q1 is electrically connected to the external power source 100, the collector of the voltage-controlled current element Q1 is electrically connected to the power supply terminal of the fan 500, the base of the voltage-controlled current element Q1 is electrically connected to one end of the fourth resistor R4, one end of the fifth resistor R5 is electrically connected to the voltage setting module 300, and the other end of the fifth resistor R5 is electrically connected to the power supply terminal of the fan 500.
Specifically, the base of the voltage-controlled current element Q1 is electrically connected to the fourth resistor R4, the collector of the voltage-controlled current element Q1 is electrically connected to the external power source 100, the emitter of the voltage-controlled current element Q1 is electrically connected to the power supply terminal of the fan 500 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected to the voltage setting module 300. The voltage-controlled current element Q1 is turned on when the voltage at the base is pulled low, so that the external power source 100 can supply power to the fan 500, and the fifth resistor R5 starts to operate and feeds back an electrical signal to the voltage setting module 300 together with the temperature detection module 200.
As shown in fig. 2, in some embodiments of the utility model, the pressure flow control element Q1 comprises a triode.
Specifically, the voltage-controlled current element Q1 may be a PNP transistor. It is understood that the type of transistor selected by the voltage-controlled current element Q1 can be adaptively selected according to actual needs.
As shown in fig. 2, in a specific embodiment, FAN is a power input port of the external power supply 100, and CON1 is a FAN 500. The external power supply 100 supplies a voltage FAN of 12V, the reference voltage chip U1 of 2.5V, the first resistor R1 of 3.9K, the second resistor R2 of 1.5K, and the fifth resistor R5 of 39K.
Firstly, the temperature sampling resistor RT detects the temperature parameter of the power supply equipment to be detected, the reference voltage chip U1 sets a preset voltage of 2.5V, and at the moment, if the second port and the third port of the reference voltage chip U1 are to be conducted, the temperature sampling resistor RT is required to reach a certain resistance value.
When the switch control circuit starts to work, the voltage-current control element Q1 is not switched on, and at this time, the fifth resistor R5 does not participate in the circuit work, so that, in combination with the power supply voltage of the external power supply 100, the resistance value of the first resistor R1, the resistance value of the second resistor R2, and the preset voltage, the resistance value Rbo of the reference voltage chip U1, which is switched on by the temperature sampling resistor RT, is 2K, and can be obtained by querying a resistance value-temperature correspondence table of the temperature sampling resistor RT, and the temperature detected by the temperature sampling resistor RT is 53 ℃. Before the temperature detected by the temperature sampling resistor RT reaches 53 ℃, the voltage of a first port of a reference voltage chip U1 is lower than a preset voltage by 2.5V, a second port and a third port of a reference voltage chip U1 are not conducted, the base voltage of a voltage control current element Q1 is not pulled low, the voltage control current element Q1 is in an off state, an external power supply 100 cannot supply power to the fan 500, and the fan 500 does not work; after the temperature detected by the temperature sampling resistor RT reaches 53 ℃, the voltage of the first port of the reference voltage chip U1 is greater than or equal to the preset voltage 2.5V, the second port and the third port of the reference voltage chip U1 are turned on, so that the base voltage of the voltage-controlled current element Q1 is pulled low, the voltage-controlled current element Q1 is closed, the external power supply 100 supplies power to the fan 500, and the fan 500 starts to operate.
After the voltage-current control element Q1 is turned on, the fifth resistor R5 participates in the circuit operation, and at this time, if the second port and the third port of the reference voltage chip U1 are to be turned off, the temperature sampling resistor RT needs to reach another resistance value. Therefore, by combining the power supply voltage of the external power supply 100, the resistance of the first resistor R1, the resistance of the second resistor R2, the resistance of the fifth resistor R5, and the preset voltage, the temperature sampling resistor RT can obtain the resistance Rcf of the reference voltage chip U1 by calculation, which is 2.7K, and by querying the resistance-temperature correspondence table of the temperature sampling resistor RT, the temperature detected by the temperature sampling resistor RT is 35 ℃. Before the temperature detected by the temperature sampling resistor RT is lower than 35 ℃, the voltage of the first port of the reference voltage chip U1 is greater than or equal to the preset voltage 2.5V, the second port and the third port of the reference voltage chip U1 are conducted, the base voltage of the voltage-controlled current component Q1 is continuously pulled low, the voltage-controlled current component Q1 is closed, the external power supply 100 continuously supplies power to the fan 500, and the fan 500 normally works; after the temperature detected by the temperature sampling resistor RT is lower than 35 ℃, the voltage of the first port of the reference voltage chip U1 is lower than the preset voltage by 2.5V, the second port and the third port of the reference voltage chip U1 are cut off, the base voltage of the voltage control current element Q1 is reset high, the voltage control current element Q1 is turned off, the external power supply 100 cannot supply power to the fan 500, and the fan 500 stops working. Therefore, the function of automatically switching on and off the power supply by the switch control circuit according to the temperature of the power supply equipment is realized.
An embodiment of the present invention further provides a switch control system, including the switch control circuit described in any of the above embodiments and an external power supply, where the external power supply is electrically connected to the switch control circuit.
According to the switch control system provided by the embodiment of the utility model, the function of automatically switching the power supply according to the temperature of the power supply equipment is realized by adopting the switch control circuit, and the problem of no-load power consumption is solved.
The embodiment of the utility model also provides heat dissipation equipment, which comprises the switch control system and the fan described in the embodiment.
According to the heat dissipation equipment provided by the embodiment of the utility model, the function of automatically switching on and off the power supply according to the temperature of the power supply equipment is realized by adopting the switch control system, and the problems of no-load power consumption and no-load noise are solved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (8)
1. Switch control circuit is applied to the fan, its characterized in that includes:
the temperature detection module is electrically connected with an external power supply and is used for detecting a temperature parameter and generating a temperature electric signal according to the temperature parameter;
the voltage setting module is electrically connected with the temperature detection module and is used for setting a preset voltage;
the switch control module is respectively and electrically connected with the voltage setting module, an external power supply and a power supply end of the fan, and is used for generating a feedback signal;
the voltage setting module is used for generating a control signal according to the preset voltage, the temperature electric signal and the feedback signal; the switch control module is used for switching on or off according to the control signal.
2. The switch control circuit of claim 1, wherein the temperature detection module comprises:
one end of the temperature sampling resistor is electrically connected with the voltage setting module;
one end of the first resistor is electrically connected with an external power supply, and the other end of the first resistor is electrically connected with the other end of the temperature sampling resistor;
and one end of the second resistor is electrically connected with the voltage setting module and the connection node of the temperature sampling resistor, and the other end of the second resistor is grounded.
3. The switch control circuit of claim 1, wherein the voltage setting module comprises:
the first port of the reference voltage chip is used for being electrically connected with the temperature detection module and the switch control module respectively, the second port of the reference voltage chip is used for being grounded, and the third port of the reference voltage chip is used for being electrically connected with the switch control module.
4. The switch control circuit of claim 1, wherein the switch control module comprises:
the switch unit is used for being electrically connected with the voltage setting module, an external power supply and a power supply end of the fan respectively;
one end of the third resistor is used for being electrically connected with the voltage setting module, and the other end of the third resistor is used for being electrically connected with an external power supply;
and one end of the fourth resistor is used for being electrically connected with the voltage setting module and the connection node of the third resistor, and the other end of the fourth resistor is used for being electrically connected with the switch unit.
5. The switch control circuit according to claim 4, wherein the switching unit comprises:
the emitter of the voltage-current control element is electrically connected with an external power supply, the collector of the voltage-current control element is electrically connected with the power supply end of the fan, and the base of the voltage-current control element is used for being electrically connected with the other end of the fourth resistor;
one end of the fifth resistor is used for being electrically connected with the voltage setting module, and the other end of the fifth resistor is used for being electrically connected with the power supply end of the fan.
6. The switch control circuit of claim 5, wherein the voltage control current element comprises a triode.
7. A switch control system, comprising:
the switch control circuit of any one of claims 1 to 6;
an external power source electrically connected to the switch control circuit.
8. Heat sink apparatus comprising a switch control system according to claim 7 and a fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122168002.XU CN216157950U (en) | 2021-09-08 | 2021-09-08 | Switch control circuit, system and heat dissipation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122168002.XU CN216157950U (en) | 2021-09-08 | 2021-09-08 | Switch control circuit, system and heat dissipation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216157950U true CN216157950U (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122168002.XU Active CN216157950U (en) | 2021-09-08 | 2021-09-08 | Switch control circuit, system and heat dissipation equipment |
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| CN (1) | CN216157950U (en) |
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2021
- 2021-09-08 CN CN202122168002.XU patent/CN216157950U/en active Active
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