CN212137547U - Dual negative voltage output circuit and electronic device - Google Patents
Dual negative voltage output circuit and electronic device Download PDFInfo
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- CN212137547U CN212137547U CN202020492808.7U CN202020492808U CN212137547U CN 212137547 U CN212137547 U CN 212137547U CN 202020492808 U CN202020492808 U CN 202020492808U CN 212137547 U CN212137547 U CN 212137547U
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Abstract
The utility model discloses a two negative voltage output circuit and electronic equipment. Wherein, this circuit includes: a power supply circuit outputting a first positive voltage through an output terminal, wherein the output terminal of the power supply circuit includes a positive output terminal and ground; the input end of the buck conversion circuit is connected with the output end of the power circuit and is used for converting the first positive voltage into a second positive voltage; the ground outputs a first negative voltage relative to the positive output end of the power supply circuit, and the positive output end of the buck conversion circuit outputs a second negative voltage relative to the positive output end of the power supply circuit. The utility model provides an among the prior art two negative voltage output circuit need two transformers of taking the isolation, lead to the great technical problem of whole volume.
Description
Technical Field
The utility model relates to a circuit field particularly, relates to a two negative voltage output circuit and electronic equipment.
Background
The double negative voltage output circuit is widely applied, and currently, a common double negative voltage output circuit adopts double isolation transformers (LLC1 and LLC2) to output V1 and V2, and then positive electrodes of V1 and V2 are connected together, and the end is defined as reference GND, so that two voltage outputs of-V1 and-V2 can be obtained. However, this solution requires two isolated transformers, which makes the whole circuit bulky and makes it difficult to increase the power density.
Aiming at the problem that the whole size is large because a double negative voltage output circuit in the prior art needs two isolated transformers, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a two negative voltage output circuit and electronic equipment to solve two negative voltage output circuit among the prior art at least and need two transformers of taking the isolation, lead to the great technical problem of whole volume.
According to an aspect of the embodiments of the present invention, there is provided a dual negative voltage output circuit, including: a power supply circuit outputting a first positive voltage through an output terminal, wherein the output terminal of the power supply circuit includes a positive output terminal and ground; the input end of the buck conversion circuit is connected with the output end of the power circuit and is used for converting the first positive voltage into a second positive voltage; the ground outputs a first negative voltage relative to the positive output end of the power supply circuit, and the positive output end of the buck conversion circuit outputs a second negative voltage relative to the positive output end of the power supply circuit.
Further, the second positive voltage is lower than the first positive voltage.
Further, the dual negative voltage output circuit further includes: the power supply circuit comprises a first back-end circuit, wherein a negative input end of the first back-end circuit is connected with the ground, a reference end of the first back-end circuit is connected with a positive output end of the power supply circuit, and output voltage of the first back-end circuit is supplied to a first load.
Further, the dual negative voltage output circuit further includes: and the negative input end of the second back-end circuit is connected with the positive output end of the buck conversion circuit, the reference end of the second back-end circuit is connected with the positive output end of the power supply circuit, and the output voltage of the second back-end circuit is supplied to a second load.
Further, the power supply circuit includes: the alternating current input power supply is connected with a power grid and used for providing alternating current; the rectification filter circuit is connected with the alternating current input power supply and is used for converting alternating current provided by the alternating current input power supply into direct current; and the resonance circuit is connected with the rectifying and filtering circuit and is used for reducing the direct current obtained by converting the alternating current to the first positive voltage and outputting the first positive voltage.
Further, the buck conversion circuit is a synchronous buck conversion circuit.
Further, the synchronous buck conversion circuit includes: the drain electrode of the first field effect transistor is connected to the positive output end of the power supply circuit, and the source electrode of the first field effect transistor is connected to the first end of the energy storage inductor; the drain electrode of the second field effect transistor is connected to the first end of the energy storage inductor, and the source electrode of the second field effect transistor is connected to the ground; the first end of the energy storage inductor is connected with the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor, and the second end of the energy storage inductor is connected with the first end of the filter capacitor; and the first end of the filter capacitor is connected to the energy storage inductor, and the second end of the filter capacitor is connected to the ground.
Further, the synchronous buck conversion circuit further includes: and the control end outputs current from the positive output end of the power circuit to the positive output end of the synchronous buck conversion circuit when the positive output end of the power circuit and the positive output end of the synchronous buck conversion circuit are loaded, so that the voltage of the positive output end of the synchronous buck conversion circuit to the ground is increased, the control end controls the duty ratio of the second field effect tube to be increased when the voltage of the positive output end of the synchronous buck conversion circuit to the ground is detected to be increased, and the energy of the positive output end of the synchronous buck conversion circuit to the ground is returned to the place between the positive output end of the power circuit and the ground, so that the voltage of the positive output end of the synchronous buck conversion circuit to the ground is stabilized.
Further, the first negative voltage is the opposite of the first positive voltage, and the second negative voltage is the opposite of the difference between the first positive voltage and the second positive voltage.
According to an aspect of the embodiments of the present invention, there is provided an electronic device, the dual negative voltage output circuit mentioned above.
In an embodiment of the present invention, the power circuit outputs a first positive voltage through an output terminal, wherein the output terminal of the power circuit includes a positive output terminal and a ground; the input end of the voltage-reducing conversion circuit is connected with the output end of the power supply circuit and is used for converting the first positive voltage into a second positive voltage, and the second positive voltage is lower than the first positive voltage; the ground outputs a first negative voltage relative to the positive output end of the power supply circuit, and the positive output end of the buck conversion circuit outputs a second negative voltage relative to the positive output end of the power supply circuit. According to the scheme, the positive output end of the buck conversion circuit outputs the second positive voltage to the ground, and the positive output end of the power circuit outputs the first positive voltage to the ground, so that the ground forms the first negative voltage relative to the positive output end of the power circuit, the positive output end of the buck conversion circuit forms the second negative voltage relative to the positive output end of the power circuit, and further when two negative voltages are obtained, the number of isolation transformers in the circuit is reduced, the size of the circuit is reduced, the power density of the circuit is improved, and the problem that the whole size is large due to the fact that the double negative voltage output circuit needs two isolated transformers in the prior art is solved. The BUCK conversion circuit adopted by the scheme is a BUCK with positive voltage input and positive voltage output, the market utilization rate of the BUCK is high, the cost is low, and the effect of reducing the overall cost of the product can be achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of a dual negative output circuit according to the prior art;
fig. 2 is a schematic diagram of a dual negative voltage output circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an alternative dual negative voltage output circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a dual negative voltage output circuit coupled to a back-end circuit according to an embodiment of the present invention; and
fig. 5 is a circuit diagram of a dual negative voltage output circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to the embodiment of the present invention, an embodiment of a dual negative voltage output circuit is provided, fig. 2 is a schematic diagram of a dual negative voltage output circuit according to the embodiment of the present invention, as shown in fig. 2, the circuit includes:
a power supply circuit 10 outputting a first positive voltage through an output terminal, wherein the output terminal of the power supply circuit includes a positive output terminal 101 and a ground 102;
the input end of the buck conversion circuit is connected with the output end 101 of the power circuit and is used for converting the first positive voltage into a second positive voltage;
the ground 102 outputs a first negative voltage Vo1 with respect to the positive output terminal 101 of the power circuit, and the positive output terminal 201 of the buck converter circuit 20 outputs a second negative voltage Vo2 with respect to the positive output terminal 101 of the power circuit.
Specifically, the first positive voltage, the second positive voltage, the first negative voltage and the second negative voltage are all direct current. The power supply circuit is used for supplying the first positive voltage, and the power supply circuit may include a battery capable of supplying a stable first positive voltage, and may also include a rectifier circuit, a resonant circuit, and the like, and converts the obtained alternating current into the first positive voltage. In the above scheme, the output terminal of the power supply circuit is defined as the terminal with the lower potential as the ground, and the terminal with the higher potential as the positive output terminal of the power supply circuit.
In the scheme, the BUCK conversion circuit actually works in a Boost mode, and energy of a positive output end of the BUCK conversion circuit is fed back to the positive output end of the power circuit, so that the positive output end of the BUCK conversion circuit can continuously and stably output a second positive voltage to the ground.
Through the conversion of the first positive voltage by the buck conversion circuit, the output end of the double negative voltage output circuit comprises a positive output end 101 of the power circuit, a ground 102 and a positive output end 201 of the buck conversion circuit, wherein the voltage between the positive output end 101 of the power circuit and the ground 102 is the first positive voltage, so that the first negative voltage (the opposite number of the first positive voltage) can be output between the ground 102 and the positive output end 101 of the power circuit; since the voltage between the positive output terminal 201 of the buck converter circuit and the ground 102 is a second positive voltage, a second negative voltage (the inverse of the difference between the first positive voltage and the second positive voltage) can be output between the positive output terminal 201 of the buck converter circuit and the positive output terminal 101 of the power supply circuit.
Fig. 3 is a schematic diagram of an alternative dual negative voltage output circuit according to an embodiment of the present invention, and in conjunction with fig. 3, an AC Input, a rectifying and filtering circuit, and an LLC (resonant circuit) form a power supply circuit. Defining the low potential Output terminal of LLC as GND (ground), i.e. Output1, a first positive voltage V1 is Output between the positive Output terminal of LLC and GND, and a second positive voltage V3 is Output between Output2 of BUCK and GND. Energy is transmitted bidirectionally between the input and output of the BUCK, which feeds back (V3 × I1) energy back to V1, so that the V3 voltage can be maintained stable and without energy loss.
Still by way of example in fig. 3, if it is desired to obtain outputs of-4V and-3V, the first positive voltage V1 may be designated as 4V, and the buck-type change circuit may be used to convert V1 to V3 and V3 to 1V, so that the outputs of-4V and- (V1-V3) V, i.e., -3V, may be obtained.
Therefore, in the above embodiments of the present invention, the power circuit outputs the specified first positive voltage through the output terminal, wherein the output terminal of the power circuit includes the positive output terminal and the ground; the input end of the voltage-reducing conversion circuit is connected with the output end of the power supply circuit and is used for converting the first positive voltage into a second positive voltage; the ground outputs a first negative voltage relative to the positive output end of the power supply circuit, and the positive output end of the buck conversion circuit outputs a second negative voltage relative to the positive output end of the power supply circuit. According to the scheme, the positive output end of the buck conversion circuit outputs the second positive voltage to the ground, and the positive output end of the power circuit outputs the first positive voltage to the ground, so that the ground forms the first negative voltage relative to the positive output end of the power circuit, the positive output end of the buck conversion circuit forms the second negative voltage relative to the positive output end of the power circuit, and further when two negative voltages are obtained, the number of isolation transformers in the circuit is reduced, the size of the circuit is reduced, the power density of the circuit is improved, and the problem that the whole size is large due to the fact that the double negative voltage output circuit needs two isolated transformers in the prior art is solved. The BUCK conversion circuit adopted by the scheme is a BUCK with positive voltage input and positive voltage output, the market utilization rate of the BUCK is high, the cost is low, and the effect of reducing the overall cost of the product can be achieved.
As an alternative embodiment, the second positive voltage is lower than the first positive voltage.
As an alternative embodiment, the circuit further includes: the power supply circuit comprises a first back-end circuit, wherein a negative input end of the first back-end circuit is connected with the ground, a reference end of the first back-end circuit is connected with a positive output end of the power supply circuit, and output voltage of the first back-end circuit is supplied to a first load.
The ground outputs a first negative voltage relative to the positive output end of the power supply circuit, so that the negative input end of the first back-end circuit is connected to the ground, and the reference end is connected to the positive output end of the power supply circuit, namely, the first negative voltage can be input into the first back-end circuit.
Fig. 4 is a schematic diagram of a dual negative voltage output circuit according to an embodiment of the present invention, which is connected to a back-end circuit, and as shown in fig. 4, a negative input terminal 411 of the first back-end circuit 41 is connected to the ground 102, and a reference terminal 412 of the first back-end circuit is connected to a positive output terminal 101 of the power supply circuit, so as to obtain a negative voltage output.
As an alternative embodiment, the circuit further includes: and the negative input end of the second back-end circuit is connected with the positive output end of the buck conversion circuit, the reference end of the second back-end circuit is connected with the positive output end of the power supply circuit, and the output voltage of the second back-end circuit is supplied to a second load.
The first back-end circuit is a power supply circuit of a first load, the second back-end circuit is a power supply circuit of a second load, and the first back-end circuit and the second back-end circuit may belong to the same device. For example, for a color screen power supply with double negative voltage outputs, it needs to supply power to both the blue lamp and the green lamp, and also needs to supply power to the red lamp, and the power supply voltage required by the blue lamp and the green lamp is-4V, and the power supply voltage required by the red lamp is-3V, so the power supply of the blue lamp and the green lamp can be used as the first back-end circuit, and the power supply of the red lamp can be used as the second back-end circuit, both of which belong to the color screen power supply with double negative voltage outputs.
Similarly, since the positive output end of the buck conversion circuit outputs the second negative voltage relative to the positive output end of the power circuit, the negative input end of the second back-end circuit is connected to the positive output end of the buck conversion circuit, and the reference end is connected to the positive output end of the power circuit, so that the second negative voltage can be input to the second back-end circuit.
As shown in fig. 4, the negative input terminal 421 of the second back-end circuit 42 is connected to the positive output terminal 201 of the buck converter circuit, and the reference terminal 422 of the second back-end circuit is connected to the positive output terminal 101 of the power supply circuit, so that another negative voltage can be output.
As an alternative embodiment, the power supply circuit comprises: the alternating current input power supply is connected with a power grid and used for providing alternating current; the rectification filter circuit is connected with the alternating current input power supply and is used for converting alternating current provided by the alternating current input power supply into direct current; and the resonance circuit is connected with the rectifying and filtering circuit and is used for reducing the direct current obtained by converting the alternating current to the first positive voltage and outputting the first positive voltage.
Referring to fig. 3, in this example, an ac input power source is connected to a power grid, 220V ac power is obtained from the power grid, the 220V ac power is rectified and filtered by a rectifying and filtering circuit to obtain dc power, and the rectified and filtered dc power is processed by a resonant circuit to obtain dc power with a first positive voltage, i.e., V1.
Fig. 5 is a circuit diagram of a dual negative voltage output circuit according to an embodiment of the present invention, and as an alternative embodiment, the buck conversion circuit is a synchronous buck conversion circuit, as shown in fig. 5. The synchronous buck conversion circuit comprises: a first field effect transistor Q3, wherein the drain D of the first field effect transistor Q3 is connected to the positive output end of the power circuit, and the source S of the first field effect transistor Q3 is connected to the first end of the energy storage inductor L1; a second field effect transistor Q4, a drain D of the second field effect transistor Q4 is connected to the first end of the energy storage inductor L1, and a source S of the second field effect transistor Q4 is connected to ground; the energy storage inductor L1, a first end of the energy storage inductor L1 is connected with the source S of the first field effect transistor Q3 and the drain D of the second field effect transistor Q4, and a second end of the energy storage inductor L1 is connected with a first end of a filter capacitor (E3 and E4); the filter capacitors (E3 and E4), the first ends of the filter capacitors (E3 and E4) are connected to the energy storage inductor L1, and the second ends of the filter capacitors (E3 and E4) are connected to the ground.
As an alternative embodiment, the buck-boost converter circuit further includes a control terminal (not shown in the figure), when the positive output terminal 101 of the power circuit and the positive output terminal 201 of the synchronous buck-boost converter circuit (the positive output terminal 101 of the power circuit and the positive output terminal of the synchronous buck-boost converter circuit form the voltage V2) are loaded, the current is output from the positive output terminal 101 of the power circuit and returns to the positive output terminal 201 of the synchronous buck-boost converter circuit, which causes the voltage V3 of the positive output terminal 201 of the synchronous buck-boost converter circuit to the ground 102 to increase, the control terminal controls the duty ratio of the second field effect transistor Q4 to increase when detecting that the voltage V3 of the positive output terminal 201 of the synchronous buck-boost converter circuit to the ground 102 increases, the energy V3I 1 of the positive output terminal 201 of the synchronous buck-boost converter circuit to the ground 102 is returned to between the positive output terminal 101 of the ground 102 of the power circuit (i.e. the return voltage V1), so that the voltage V3 at the positive output terminal 201 of the synchronous buck converter circuit is stabilized to ground 102.
In the above embodiment, still referring to fig. 5, the resonant circuit LLC includes fets Q1 and Q2 connected between the power input V _ BUCK and the signal ground SGND, Q1 and Q2 work complementarily and are switching MOS of the LLC resonant power supply, the resonant circuit LLC further includes fets Q202 and Q204 and transformers T200, Q202 and Q204 are synchronous rectification MOS to replace diode rectification, and have higher rectification efficiency due to smaller voltage drop of MOS, T200 is a transformer with leakage inductance and isolation function, and capacitors E1 and E2 are filter capacitors of LLC output and also input capacitors of the later-stage BUCK circuit.
Therefore, in the synchronous BUCK-type conversion circuit, the field effect transistor Q4 is used instead of the diode, so that when the BUCK is applied in the Boost mode, energy can be transmitted in both directions between the input and the output of the BUCK-type conversion circuit, and the energy at the positive output end of the BUCK-type conversion circuit is fed back to the positive output end of the power supply circuit, so that the positive output end of the BUCK-type conversion circuit can continuously and stably output the second positive voltage to the ground. And the BUCK circuit is easy to obtain, so that the type selection process is simple.
As an alternative embodiment, the first negative voltage is the inverse of the first positive voltage, and the second negative voltage is the inverse of the difference between the first positive voltage and the second positive voltage.
In the above-described aspect, the voltage of the positive output terminal of the power supply circuit with respect to ground is set to a first negative voltage, and therefore the first negative voltage is the opposite of the first positive voltage. Still referring to fig. 3, if the first positive voltage V1 is 4V and the second positive voltage V3 is 1V, the resulting first negative voltage is-4V and the second negative voltage is-3V.
Example 2
According to the embodiment of the utility model provides an electronic equipment is provided, include: the dual negative voltage output circuit of embodiment 1.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A dual negative voltage output circuit, comprising:
a power supply circuit outputting a first positive voltage through an output terminal, wherein the output terminal of the power supply circuit includes a positive output terminal and ground;
the input end of the buck conversion circuit is connected with the output end of the power circuit and is used for converting the first positive voltage into a second positive voltage;
the ground outputs a first negative voltage relative to the positive output end of the power supply circuit, and the positive output end of the buck conversion circuit outputs a second negative voltage relative to the positive output end of the power supply circuit.
2. The dual negative voltage output circuit of claim 1, wherein the second positive voltage is lower than the first positive voltage.
3. The dual negative voltage output circuit of claim 1, further comprising:
the power supply circuit comprises a first back-end circuit, wherein a negative input end of the first back-end circuit is connected with the ground, a reference end of the first back-end circuit is connected with a positive output end of the power supply circuit, and an output voltage of the first back-end circuit is supplied to a first load.
4. The dual negative voltage output circuit of claim 1, further comprising:
and the negative input end of the second back-end circuit is connected with the positive output end of the buck conversion circuit, the reference end of the second back-end circuit is connected with the positive output end of the power supply circuit, and the output voltage of the second back-end circuit is supplied to a second load.
5. The dual negative voltage output circuit of claim 1, wherein the power supply circuit comprises:
the alternating current input power supply is connected with a power grid and used for providing alternating current;
the rectification filter circuit is connected with the alternating current input power supply and is used for converting alternating current provided by the alternating current input power supply into direct current;
and the resonance circuit is connected with the rectifying and filtering circuit and is used for reducing the direct current obtained by converting the alternating current to the first positive voltage and outputting the first positive voltage.
6. The dual negative voltage output circuit of claim 1, wherein the buck conversion circuit is a synchronous buck conversion circuit.
7. The dual negative voltage output circuit of claim 6, wherein the synchronous buck conversion circuit comprises:
the drain electrode of the first field effect transistor is connected to the positive output end of the power supply circuit, and the source electrode of the first field effect transistor is connected to the first end of the energy storage inductor;
the drain electrode of the second field effect transistor is connected to the first end of the energy storage inductor, and the source electrode of the second field effect transistor is connected to the ground;
the first end of the energy storage inductor is connected with the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor, and the second end of the energy storage inductor is connected with the first end of the filter capacitor;
and the first end of the filter capacitor is connected to the energy storage inductor, and the second end of the filter capacitor is connected to the ground.
8. The dual negative voltage output circuit of claim 7, wherein the synchronous buck conversion circuit further comprises:
and the control end is used for controlling the duty ratio of the second field effect transistor to increase.
9. The dual negative voltage output circuit of claim 1, wherein the first negative voltage is the inverse of the first positive voltage, and the second negative voltage is the inverse of the difference between the first positive voltage and the second positive voltage.
10. An electronic device comprising the double negative voltage output circuit of any one of claims 1 to 8.
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| CN202020492808.7U CN212137547U (en) | 2020-04-07 | 2020-04-07 | Dual negative voltage output circuit and electronic device |
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| CN202020492808.7U CN212137547U (en) | 2020-04-07 | 2020-04-07 | Dual negative voltage output circuit and electronic device |
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