CN214069810U - Voltage switching control circuit and voltage switching control device - Google Patents
Voltage switching control circuit and voltage switching control device Download PDFInfo
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Abstract
The application relates to the technical field of voltage conversion, and provides a voltage switching control circuit and a voltage switching control device, wherein a transformation module works under the enabling action of an enabling module, and outputs a second voltage after voltage conversion is carried out on a first voltage output by a direct current power supply, then a voltage division module divides the second voltage and feeds the second voltage back to the transformation module to indicate the transformation module to adjust the second voltage, and meanwhile, the control module outputs a control voltage to the voltage division module to adjust the voltage division module to divide the second voltage, wherein the voltage division module comprises a nonlinear resistor, a second resistor, a third capacitor and a diode, so that the scheme adds the nonlinear resistor and the diode in the original voltage switching control technology, the design variable is only the nonlinear resistor and is easy to select, and the electronic elements are simple, the method is widely applied to set top boxes or switch products needing voltage switching.
Description
Technical Field
The present application relates to the field of voltage conversion technologies, and in particular, to a voltage switching control circuit and a voltage switching control device.
Background
At present, in a Direct-Current (DC-DC) fixed voltage output circuit, as shown in fig. 1, a chip U1 is a DC-DC power chip, a reference voltage is connected to the chip U1 through an input terminal Vin, and after the chip U1 performs voltage conversion on the reference voltage, a final output voltage can be obtained according to the following formula: vout ═ Vfb (1+ R2/R3), it follows that this scheme can be implemented by choosing the ratio of the resistance R2 to the resistance R3 to achieve a fixed voltage output.
If the output voltage needs to be adjusted and switched, the first mode may be to connect a resistor Rb externally to the feedback control terminal FB of the DC-DC power chip to the control voltage terminal to implement the voltage switching control function, as shown in fig. 2, when the control voltage terminal is grounded and connected to the power terminal, different voltages are output, specifically using the following formula: when Vctl is 0V, Vout Vfb (1+ (R21/(R31// Rb))); when Vctl is equal to about Vout, Vout ═ Vfb (1+ ((R21// Rb)/R31)); therefore, the output voltage of the DC-DC power supply chip can play a role of changing.
Of course, the second method may also directly adopt the variable resistance Rc instead of the resistor R2, and as shown in fig. 3, when the control voltage terminal is grounded and connected to the power supply terminal, different voltages will be output, specifically adopting the following formula: when Vctl is 0V, Vout is Vfb (1+ (Rc 1/R3)); when Vctl is approximately equal to Vout, Vout is Vfb (1+ (Rc 2/R3)).
However, in the first method, after the resistor Rb is externally connected, the original two voltage dividing resistors (the resistor R2 and the resistor R3) are re-modified to be new voltage dividing resistors, and since 3 resistance values of the original voltage dividing resistors (i.e., the resistor R31 and the resistor R21) and the newly added control resistor Rb need to be changed simultaneously, it is difficult to select an appropriate value, and it is difficult to upgrade the original non-switching power supply circuit. In the second method, although it is not necessary to change the value of the divided voltage to the ground resistance (the value of the resistance R3), the variable resistance Rc is relatively expensive, and it is relatively difficult to search for the variable resistance Rc and purchase the variable resistance Rc if a desired value is selected and the resistance change satisfies the requirement.
Therefore, how to reduce the design variables to be considered in the design becomes a technical problem which needs to be solved by adopting simple electronic components.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide a voltage switching control circuit and a voltage switching control device, which are used to solve the technical problems of more design variables and more complicated electronic components in the conventional voltage switching control technology.
A first aspect of an embodiment of the present application provides a voltage switching control circuit, including:
the voltage transformation module is connected with the direct current power supply and is configured to output a second voltage after voltage transformation is carried out on a first voltage output by the direct current power supply;
the enabling module is connected with the direct-current power supply and the voltage transformation module and is configured to enable the voltage transformation module to work when receiving the first voltage;
the current-limiting protection module is connected with the transformation module and is configured to perform current-limiting protection on the second voltage;
the voltage division module is connected with the transformation module and the current-limiting protection module, and is configured to divide the second voltage and feed the second voltage back to the transformation module so as to indicate the transformation module to regulate the second voltage;
the control module is connected with the voltage dividing module and is configured to output a control voltage to the voltage dividing module so as to adjust the voltage dividing module to divide the second voltage;
wherein, the partial pressure module includes:
the circuit comprises a nonlinear resistor, a second resistor, a third capacitor and a diode;
the first end of the second resistor and the first end of the third capacitor are connected with the current-limiting protection module, the second end of the second resistor, the second end of the third capacitor, the first end of the third resistor and the first end of the nonlinear resistor are connected with the voltage transformation module in a common mode, and the second end of the nonlinear resistor is connected with the control module through the diode.
Therefore, the voltage switching control circuit adds the nonlinear resistor and the diode in the original voltage switching control technology, the design variable is only the nonlinear resistor, the selection is easy, and the electronic element is simple.
In one embodiment, the connecting the second end of the nonlinear resistor to the control module through the diode includes:
the second end of the nonlinear resistor is connected with the cathode of the diode, and the anode of the diode is connected with the control module; or
The second end of the nonlinear resistor is connected with the anode of the diode, and the cathode of the diode is connected with the control module. This embodiment specifically defines the case where the diodes can be connected either in the forward or in the reverse direction.
In one embodiment, the method further comprises:
and the input filtering module is connected with the direct-current power supply, the enabling module and the transformation module and is configured to filter the first voltage. The embodiment is provided with an input filtering module to filter out a specific frequency band in the first voltage, so as to reduce or even eliminate interference.
In one embodiment, the method further comprises:
and the output filtering module is connected with the current-limiting protection module and the voltage division module and is configured to filter the adjusted second voltage. The embodiment is provided with the output filtering module to filter the specific frequency band of the adjusted second voltage, so as to further play a role in reducing or even eliminating interference.
In one embodiment, the transformation module comprises a DC-DC power supply chip. This embodiment defines in particular the model selection characteristic of the voltage transformation module.
In one embodiment, the enabling module includes:
a first resistor and a first capacitor;
the first end of the first resistor is connected with the direct current power supply, the second end of the first resistor and the first end of the first capacitor are connected in common and connected with the voltage transformation module, and the second end of the first capacitor is grounded. This embodiment defines a specific circuit configuration of the enabling module.
In one embodiment, the current limiting protection module includes:
a second capacitor and a first inductor;
the first end of the second capacitor is connected with the voltage transformation module, the second end of the second capacitor is connected with the first end of the first inductor, and the second end of the first inductor is connected with the voltage division module. This embodiment defines a specific circuit configuration of the current limiting protection module.
In one embodiment, the input filtering module includes:
a fourth capacitor and a fifth capacitor;
the first end of the fourth capacitor and the first end of the fifth capacitor are connected with the voltage transformation module, and the second end of the fourth capacitor and the second end of the fifth capacitor are grounded. This embodiment defines a specific circuit configuration of the input filter module.
In one embodiment, the output filtering module includes:
a sixth capacitor, a seventh capacitor and an eighth capacitor;
the first end of the sixth capacitor, the first end of the seventh capacitor and the first end of the eighth capacitor are connected in common and connected with the voltage dividing module, and the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the eighth capacitor are grounded. This embodiment defines a specific circuit configuration of the output filter module.
A second aspect of the embodiments of the present application provides a voltage switching control apparatus, including a dc power supply, and further including a voltage switching control circuit as described above.
According to the voltage switching control device, the nonlinear resistor and the diode are added in the original voltage switching control technology, the design variable is only the nonlinear resistor and is easy to select, the electronic element is simple, and the voltage switching control device is widely applied to set top boxes or switch products needing voltage switching.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the voltage switching control circuit and the voltage switching control device work under the enabling action of the enabling module through the transforming module, convert the first voltage output by the direct current power supply and output the second voltage, then, the voltage dividing module divides the second voltage and feeds the second voltage back to the transforming module to instruct the transforming module to adjust the second voltage, meanwhile, the control module outputs a control voltage to the voltage division module to adjust the voltage division module to divide the second voltage, wherein, the voltage dividing module comprises a nonlinear resistor, a second resistor, a third capacitor and a diode, therefore, the scheme adds the nonlinear resistor and the diode in the original voltage switching control technology, the design variable is only the nonlinear resistor and is easy to select, and the electronic element is simple, so that the scheme is widely applied to set top boxes or switch products needing voltage switching.
Drawings
FIG. 1 is a circuit diagram of an example of a prior art fixed voltage output circuit;
fig. 2 is a circuit diagram of an example of a DC-DC switching control circuit according to the prior art;
fig. 3 is another exemplary circuit diagram of a DC-DC switching control circuit according to the prior art;
fig. 4 is a schematic block diagram of a voltage switching control circuit according to a preferred embodiment of the present application;
FIG. 5 is a circuit diagram of an example of a voltage switching control circuit corresponding to FIG. 4;
FIG. 6 is another exemplary circuit diagram corresponding to the voltage switching control circuit of FIG. 4;
fig. 7 is a schematic block diagram of a voltage switching control circuit according to another embodiment of the present disclosure;
FIG. 8 is a circuit diagram of an example of a voltage switching control circuit corresponding to FIG. 7;
fig. 9 is another exemplary circuit diagram of a voltage switching control circuit corresponding to fig. 7.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Please refer to fig. 4, which is a schematic diagram of a structural module of a voltage switching control circuit provided in the present application, and fig. 5 and fig. 6 show two exemplary circuits of the voltage switching control circuit, which only show the relevant parts of the present embodiment for convenience of description, and the following details are described below:
the application provides a voltage switching control circuit, which comprises a transformation module 102, an enabling module 101, a current limiting protection module 103, a voltage division module 104 and a control module 105.
The transforming module 102 is connected to a dc power supply (indicated by Vin in fig. 4), and the transforming module 102 is configured to transform a first voltage output by the dc power supply and output a second voltage.
Specifically, the transforming module 102 is configured to perform voltage conversion on a first voltage output by the dc power source, including a voltage boosting process and a voltage dropping process, where the first voltage and the second voltage are both dc voltages. The transformation module 102 is implemented by a DC-DC power chip U1.
The enabling module 101 is connected to the dc power supply and transforming module 102, and the enabling module 101 is configured to enable the transforming module 102 to operate when receiving a first voltage.
Specifically, the enabling module 101 controls the transforming module 102 to be turned on and on for the transforming module 102 to transform the first voltage output by the dc power source.
The enabling module 101 comprises a first resistor R1 and a first capacitor C1;
the first end of the first resistor R1 is connected to the dc power source, the second end of the first resistor R1 is connected to the first end of the first capacitor C1 and to the transformer module 102, and the second end of the first capacitor C1 is connected to ground.
The current limiting protection module 103 is connected to the transforming module 102, and the current limiting protection module 103 is configured to perform current limiting protection on the second voltage.
Specifically, the current-limiting protection module 103 controls the current corresponding to the second voltage within a preset current range, so as to avoid the occurrence of current overload or short circuit, thereby damaging the connected load.
The current-limiting protection module 103 comprises a second capacitor C2 and a first inductor L1;
the first terminal of the second capacitor C2 is connected to the transforming module 102, the second terminal of the second capacitor C2 is connected to the first terminal of the first inductor L1, and the second terminal of the first inductor L1 is connected to the voltage dividing module 104.
The voltage dividing module 104 is connected to the transforming module 102 and the current limiting protection module 103, and the voltage dividing module 104 is configured to divide the second voltage and feed the second voltage back to the transforming module 102 to instruct the transforming module 102 to adjust the second voltage.
Specifically, the voltage divider module 104 functions as a feedback, so that the transformer module 102 timely adjusts the output of the second voltage according to the feedback.
The control module 105 is connected to the voltage dividing module 104, and the control module 105 is configured to output a control voltage to the voltage dividing module 104 to adjust the voltage dividing module 104 to divide the second voltage.
Specifically, the control module 105 is configured to control the output voltage of the voltage dividing module 104 to adjust the voltage dividing module 104 to divide the second voltage, so that the transforming module 102 adjusts the output of the second voltage. It should be understood that when the control voltage of the voltage divider module 104 is changed, the control module 105 changes the second voltage output by the voltage transformer module 102. The control module 104 is implemented by a Central Processing Unit (CPU).
As shown in fig. 5 and 6, the voltage divider module 104 includes a non-linear resistor Rc, a second resistor R2, a third resistor R3, a third capacitor C3, and a diode D1.
The first end of the second resistor R2 and the first end of the third capacitor C3 are connected to the current limiting protection module 103, the second end of the second resistor R2, the second end of the third capacitor C3, the first end of the third resistor R3 and the first end of the nonlinear resistor Rc are connected to the transformer module 102, and the second end of the nonlinear resistor Rc is connected to the control module 105 through the diode D1.
It should be understood that the non-linear resistance Rc is a resistance that changes, and the non-linear resistance Rc is a resistance that changes sharply under certain conditions. Therefore, the voltage divider module in the original voltage switching control technology is added with the nonlinear resistor Rc and the diode D1, when the control voltage of the voltage divider module 104 by the control module 105 is at a low level or a high level, the original circuit will not be affected, the design variables are only the nonlinear resistor, which is easy to select, and the electronic components are also simple.
The diode D1 may be a silicon diode or a germanium diode, but is not limited to the silicon diode or the germanium diode, and the above solution is not limited to only include one diode, and may be implemented by two or more diodes.
Moreover, the connection of the second end of the non-linear resistor Rc to the control module 105 through the diode D1 includes two conditions:
the first case is: as shown in fig. 5, the second terminal of the non-linear resistor Rc is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the control module 105;
the second case is: as shown in FIG. 6, the second terminal of the non-linear resistor Rc is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the control module 105.
Illustratively, in the first case, when Vc is at a high level, the diode D1 is turned on, and the on-resistance of the diode D1 is very small and can be ignored. The total resistance of the series branch formed by the nonlinear resistor Rc and the diode D1 is Rc, and the second voltage Vout is:
Vout＝Vfb*(1+((R2//Rc)/R3))
when Vc is at a low level, the diode D1 is not turned on, the on resistance of the diode D1 is very large, and is much higher than the second resistor R2, the third resistor R3 and the nonlinear resistor Rc, and the influence of an access circuit formed by the accessed nonlinear resistor Rc and the diode D1 on the voltage switching control circuit is negligible. The output second voltage Vout of the voltage switching control circuit is related only to the voltage division ratio of the second resistor R2 and the third resistor R3:
Vout＝Vfb*(1+R2/R3)
as can be seen from the above, when the CPU outputs the control low level, the original DC-DC power supply chip keeps the original output second voltage unchanged. Therefore, only a proper nonlinear resistor Rc needs to be selected, and the voltage switching control circuit can be ensured to obtain required reduced voltage output when the CPU outputs a control high level.
Similarly, in the second case, when Vc is high, the diode D1 is not conducting, and the on resistance of the diode D1 is very high and is far higher than the second resistor R2, the third resistor R3 and the nonlinear resistor Rc. The influence of an access circuit formed by the accessed nonlinear resistor Rc and the diode D1 on the voltage switching control circuit can be ignored. The output voltage of the voltage switching control circuit is only related to the voltage division ratio of the second resistor R2 and the third resistor R3:
Vout＝Vfb*(1+(R2/R3))
when Vc is low, the diode D1 is turned on, and the on-resistance of the diode D1 is very small and negligible. The total resistance of the series branch formed by the nonlinear resistor Rc and the diode D1 is Rc, and the second voltage Vout is:
Vout＝Vfb*(1+(R2/(R3//Rc))
as can be seen from the above, when the CPU outputs the control high level, the original DC-DC power supply chip keeps the original output second voltage unchanged. Therefore, only a proper nonlinear resistor Rc needs to be selected, and the voltage switching control circuit can be ensured to obtain the required boosted voltage output when the CPU output controls the low level.
Referring to fig. 7, for the purpose of illustration, only the relevant parts of the present embodiment are shown in the block structure of a voltage switching control circuit according to another embodiment of the present application, which is detailed as follows:
as an embodiment of the present application, on the basis of the embodiment shown in fig. 4, the voltage switching control circuit further includes an input filtering module 106;
the input filter module 106 is connected to the dc power supply, the enable module 101 and the transformer module 102, and the input filter module 106 is configured to filter the first voltage.
Specifically, the input filter module 106 is configured to filter out a specific frequency band in the first voltage, so as to reduce or even eliminate interference.
As an embodiment of the present application, on the basis of the embodiment shown in fig. 4, the voltage switching control circuit further includes an output filtering module 107;
the output filtering module 107 is connected to the current limiting protection module 103 and the voltage dividing module 104, and is configured to perform filtering processing on the adjusted second voltage.
Specifically, the output filtering module 107 is configured to filter out a specific frequency band of the adjusted second voltage, so as to further reduce or even eliminate interference.
Fig. 8 and 9 show two exemplary circuits corresponding to the voltage switching control circuit of fig. 7, and for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
as an embodiment of the present application, the input filter module 106 includes a fourth capacitor C4 and a fifth capacitor C5.
The first terminal of the fourth capacitor C4 and the first terminal of the fifth capacitor C5 are connected to the transformer module 102, and the second terminal of the fourth capacitor C4 and the second terminal of the fifth capacitor C5 are grounded.
As an embodiment of the present application, the output filter module 107 includes a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8.
A first end of the sixth capacitor C6 is commonly connected to the first end of the seventh capacitor C7 and the first end of the eighth capacitor C8, and is connected to the voltage dividing module 104, and a second end of the sixth capacitor C6 is grounded to the second end of the seventh capacitor C7 and the second end of the eighth capacitor C8.
As shown in fig. 8, the cathode of the diode D1 is connected to the non-linear resistor Rc, and the anode of the diode D1 is connected to the control module 105, so that when the control voltage output from the control module 105 to the voltage divider module 104 is at a high level, the second voltage output from the DC-DC power chip U1 is reduced.
As shown in fig. 9, the anode of the diode D1 is connected to the non-linear resistor Rc, and the cathode of the diode D1 is connected to the control module 105, so that when the control voltage output from the control module 105 to the voltage divider module 104 is at a low level, the second voltage output from the DC-DC power chip U1 is increased.
The present application provides in a second aspect a voltage switching control device comprising a dc power supply, and further comprising a voltage switching control circuit as described above. The voltage switching control device is widely applied to set top boxes or switch products needing voltage switching.
It should be noted that, the voltage switching control device is added with a dc power supply on the basis of the voltage switching control circuit, so that the functional description and the principle description of the enabling module 101, the transforming module 102, the current limiting protection module 103, the voltage dividing module 104, the control module 105, the input filtering module 106 and the output filtering module 107 of the voltage switching control circuit can refer to the embodiments of fig. 4 to 9, and are not repeated herein.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the voltage switching control circuit and the voltage switching control device work under the enabling action of the enabling module through the transforming module, convert the first voltage output by the direct current power supply and output the second voltage, then, the voltage dividing module divides the second voltage and feeds the second voltage back to the transforming module to instruct the transforming module to adjust the second voltage, meanwhile, the control module outputs a control voltage to the voltage division module to adjust the voltage division module to divide the second voltage, wherein, the voltage dividing module comprises a nonlinear resistor, a second resistor, a third capacitor and a diode, therefore, the scheme adds the nonlinear resistor and the diode in the original voltage switching control technology, the design variable is only the nonlinear resistor and is easy to select, and the electronic element is simple, so that the scheme is widely applied to set top boxes or switch products needing voltage switching.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill 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 substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A voltage switching control circuit, comprising:
the voltage transformation module is connected with the direct current power supply and is configured to output a second voltage after voltage transformation is carried out on a first voltage output by the direct current power supply;
the enabling module is connected with the direct-current power supply and the voltage transformation module and is configured to enable the voltage transformation module to work when receiving the first voltage;
the current-limiting protection module is connected with the transformation module and is configured to perform current-limiting protection on the second voltage;
the voltage division module is connected with the transformation module and the current-limiting protection module, and is configured to divide the second voltage and feed the second voltage back to the transformation module so as to indicate the transformation module to regulate the second voltage;
the control module is connected with the voltage dividing module and is configured to output a control voltage to the voltage dividing module so as to adjust the voltage dividing module to divide the second voltage;
wherein, the partial pressure module includes:
the circuit comprises a nonlinear resistor, a second resistor, a third capacitor and a diode;
the first end of the second resistor and the first end of the third capacitor are connected with the current-limiting protection module, the second end of the second resistor, the second end of the third capacitor, the first end of the third resistor and the first end of the nonlinear resistor are connected with the voltage transformation module in a common mode, and the second end of the nonlinear resistor is connected with the control module through the diode.
2. The voltage switching control circuit of claim 1, wherein the coupling of the second terminal of the non-linear resistor to the control module through the diode comprises:
the second end of the nonlinear resistor is connected with the cathode of the diode, and the anode of the diode is connected with the control module; or
The second end of the nonlinear resistor is connected with the anode of the diode, and the cathode of the diode is connected with the control module.
3. The voltage switching control circuit of claim 1, further comprising:
and the input filtering module is connected with the direct-current power supply, the enabling module and the transformation module and is configured to filter the first voltage.
4. The voltage switching control circuit of claim 1, further comprising:
and the output filtering module is connected with the current-limiting protection module and the voltage division module and is configured to filter the adjusted second voltage.
5. The voltage switching control circuit of claim 1, wherein the transformation module comprises a DC-DC power chip.
6. The voltage switching control circuit of claim 1, wherein the enabling module comprises:
a first resistor and a first capacitor;
the first end of the first resistor is connected with the direct current power supply, the second end of the first resistor and the first end of the first capacitor are connected in common and connected with the voltage transformation module, and the second end of the first capacitor is grounded.
7. The voltage switching control circuit of claim 1, wherein the current limiting protection module comprises:
a second capacitor and a first inductor;
the first end of the second capacitor is connected with the voltage transformation module, the second end of the second capacitor is connected with the first end of the first inductor, and the second end of the first inductor is connected with the voltage division module.
8. The voltage switching control circuit of claim 3, wherein the input filtering module comprises:
a fourth capacitor and a fifth capacitor;
the first end of the fourth capacitor and the first end of the fifth capacitor are connected with the voltage transformation module, and the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.
9. The voltage switching control circuit of claim 4, wherein the output filtering module comprises:
a sixth capacitor, a seventh capacitor and an eighth capacitor;
the first end of the sixth capacitor, the first end of the seventh capacitor and the first end of the eighth capacitor are connected in common and connected with the voltage dividing module, and the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the eighth capacitor are grounded.
10. A voltage switching control apparatus comprising a dc power supply, characterized by further comprising a voltage switching control circuit according to any one of claims 1 to 9.
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| CN202022932818.0U CN214069810U (en) | 2020-12-09 | 2020-12-09 | Voltage switching control circuit and voltage switching control device |
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