CN212695913U - Switching power supply and electrical equipment - Google Patents
Switching power supply and electrical equipment Download PDFInfo
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- CN212695913U CN212695913U CN202021283714.5U CN202021283714U CN212695913U CN 212695913 U CN212695913 U CN 212695913U CN 202021283714 U CN202021283714 U CN 202021283714U CN 212695913 U CN212695913 U CN 212695913U
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Abstract
The utility model provides a switching power supply and electrical equipment. Wherein, switching power supply includes: the power supply circuit comprises a transformer, a voltage acquisition circuit, an alternating current input end, a direct current output end and a power supply chip, wherein the alternating current input end, the direct current output end and the power supply chip are respectively connected with the transformer; and the voltage regulating circuit comprises a voltage regulating chip and a signal modulation circuit, the voltage regulating chip sends a voltage regulating signal to the voltage acquisition circuit through the signal modulation circuit, the voltage acquisition circuit acquires the voltage regulating signal and the voltage of the direct current output end and feeds back the final voltage to the power supply chip, and the power supply chip controls the on-off of the alternating current input end according to the final voltage. The utility model discloses a switching power supply can change the direct current magnitude of voltage of switching power supply's output through voltage regulating circuit output adjustable voltage regulation signal initiatively, ensures that switching power supply output's voltage is normal and stable, promotes switching power supply's intelligent degree and the reliability of power supply.
Description
Technical Field
The utility model relates to the technical field of electrical apparatus, especially, relate to switching power supply and electrical equipment.
Background
At present, as shown in fig. 4, a general switching power supply for a household appliance changes a voltage of a voltage sampling point through an adjustable resistor, so as to change an output voltage of the switching power supply, and the following technical problems exist: the adjustable resistor needs manual operation or is changed through environmental factors, the voltage regulation of the output voltage of the switching power supply cannot be actively realized, the intelligent degree of the switching power supply is low, the reliability of the output voltage is poor, and the stability of an electric appliance using the switching power supply is influenced.
Disclosure of Invention
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.
Therefore, an object of the present invention is to provide a switching power supply. The switching power supply has the advantages of normal and stable output voltage, and the intelligent degree and the power supply reliability of the switching power supply are improved.
Another object of the present invention is to provide an electrical apparatus.
In order to achieve the above object, a first aspect of the present invention discloses a switching power supply, including: the power supply circuit comprises a transformer, a voltage acquisition circuit, an alternating current input end, a direct current output end and a power supply chip, wherein the alternating current input end, the direct current output end and the power supply chip are respectively connected with the transformer; the voltage regulating circuit comprises a voltage regulating chip and a signal modulation circuit, the voltage regulating chip sends a voltage regulating signal to the voltage acquisition circuit through the signal modulation circuit, the voltage acquisition circuit acquires the voltage regulating signal and the voltage of the direct current output end and feeds back the final voltage to the power chip, and the power chip controls the on-off of the alternating current input end according to the final voltage.
Furthermore, the voltage regulating chip is a single chip microcomputer, the single chip microcomputer outputs an adjustable PWM signal, and the PWM signal passes through the signal modulation circuit and then is output to the voltage acquisition circuit.
Further, the signal modulation circuit includes:
the filter circuit is used for filtering the voltage regulating signal;
a follower circuit that increases a current value of the voltage regulation signal filtered by the filter circuit.
Further, the filter circuit includes:
one end of the first resistor is connected with the voltage regulating chip;
one end of the second resistor is connected with the other end of the first resistor;
one end of the first capacitor is connected with a node between the first resistor and the second resistor, and the other end of the first capacitor is grounded;
and one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is grounded.
Further, the follower circuit includes:
and the positive input end of the operational amplifier is connected with a node between the second resistor and the second capacitor, the output end of the operational amplifier is connected with the voltage acquisition circuit, and the output end of the operational amplifier is connected with the reverse input end of the operational amplifier.
Further, still include:
and the feedback circuit is respectively connected with the direct current output end and the voltage regulating chip so as to feed the voltage of the direct current output end back to the voltage regulating chip, and the voltage regulating chip monitors the voltage of the direct current output end.
Furthermore, the voltage regulating chip is connected with the alternating current input end through a first voltage stabilizing circuit, and the alternating current input end supplies power to the voltage regulating chip through the first voltage stabilizing circuit.
Furthermore, a primary coil of the transformer is connected with the alternating current input end, a first secondary coil of the transformer is connected with the direct current output end, and a second secondary coil of the transformer supplies power to the power supply chip.
A second aspect of the present invention discloses an electrical apparatus, including: the switching power supply according to the first aspect described above.
Further, the electrical appliance is a refrigerator.
The above technical solution or solutions of the present invention have at least one of the following technical effects:
the utility model discloses a switching power supply and electrical equipment can change the direct current's of switching power supply's output voltage value through voltage regulating circuit output adjustable voltage regulation signal initiatively, from this, can ensure that switching power supply output's voltage is normal and stable, promotes switching power supply's intelligent degree and the reliability of power supply.
Additional aspects and advantages of the invention 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 invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a switching power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a switching power supply according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a signal modulation circuit in a voltage regulation circuit of a switching power supply according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a prior art switching power supply.
Reference numerals:
110: a power supply circuit; 120: a voltage regulating circuit; 111: a transformer; 112: a voltage acquisition circuit; 113: an alternating current input end; 114: a DC output terminal; 115: and a power supply chip.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The following describes a switching power supply and an electric device according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a block diagram of a switching power supply according to an embodiment of the present invention. As shown in fig. 1, and in conjunction with fig. 2, a switching power supply according to an embodiment of the present invention includes: a power supply circuit 110 and a voltage regulator circuit 120.
The power circuit 110 includes a transformer 111, a voltage acquisition circuit 112, an ac input terminal 113, a dc output terminal 114 and a power chip 115, which are respectively connected to the transformer 111, and the voltage acquisition circuit 112 is respectively connected to the power chip 115 and the dc output terminal 114. The voltage regulating circuit 120 includes a voltage regulating chip 121 and a signal modulating circuit 122, and the voltage regulating chip 121 sends a voltage regulating signal to the voltage collecting circuit 112 through the signal modulating circuit 122. The voltage acquisition circuit 112 acquires the voltage-regulating signal and the voltage of the dc output terminal 114, and feeds back the final voltage to the power chip 115, and the power chip 115 controls the on/off of the ac input terminal 113 according to the final voltage.
In one specific example, as shown in fig. 2, a primary winding (i.e., a primary winding) of the transformer 111 is connected to the ac input terminal 113, a first secondary winding (i.e., a secondary winding) of the transformer 111 is connected to the dc output terminal 114, and a second secondary winding (i.e., an auxiliary winding) of the transformer 111 supplies power to the power chip 115. Namely: the primary winding of the transformer 111 is connected to the ac input terminal 113, and the second secondary winding of the transformer 111 is connected to the power chip 115 to supply power to the power chip 115.
As shown in fig. 2, the AC input terminal 113 includes an AC terminal (i.e., AC input) to which AC power is connected, a power filter circuit that filters AC power received at the AC terminal, and a rectifying filter circuit that rectifies the AC power. The AC terminal passes through the power filter circuit and the rectifying filter circuit and then forms a loop with the primary coil of the transformer 111. Of course, a back-voltage suppressing circuit may be connected in parallel to both ends of the primary coil of the transformer 111.
The dc output terminal 114 outputs dc power V0 which is transformed by the transformer 111 and supplied to the switching power supply. The two ends of the first secondary winding of the transformer 111 can be connected with an electrolytic capacitor in parallel.
The power chip 115 is typically connected to the second secondary winding of the transformer 111 through a regulation circuit. The electric energy of the second secondary coil of the transformer 111 is stabilized by the voltage stabilizing circuit to provide a working voltage for the power chip 115.
The voltage acquisition circuit 112 comprises a three-terminal regulator tube, a comparator, an isolation optocoupler and the like, wherein the voltage acquisition circuit 112 obtains a final voltage through a voltage input at a voltage acquisition point between the resistor 5 and the resistor 6, and feeds the final voltage back to the power chip 115, so that the power chip 115 controls the on-off of the alternating current input end 113 according to a final power supply. As shown in fig. 2, the ac input terminal 113 is provided with a control switch, and the power chip 115 sends a PWM control signal (i.e., PWM control) to the control switch, so that the control switch switches the on-off state according to the PWM control signal, and the voltage of the dc power at the dc output terminal 114 is changed after the input ac power passes through the transformer.
The above is a description of the power supply circuit 110 and its operation principle, and the structure and operation principle of the voltage regulating circuit 120 are described in detail below.
As shown in fig. 2 and with reference to fig. 1, the voltage regulating chip 121 of the voltage regulating circuit 120 is, for example, a single chip, the single chip outputs an adjustable PWM signal (i.e., a PWM wave shown in fig. 2), and the PWM signal passes through the signal modulating circuit 122 and is then output to the voltage collecting circuit 112, that is: to a voltage collection point between the resistor 5 and the resistor 6. Thus, the voltage acquisition circuit 112 acquires the PWM signal output by the single chip microcomputer and the output voltage (i.e., voltage) of the dc output terminal 114, and then feeds back the final voltage to the power chip 115 after being processed by the voltage acquisition circuit 112, and the power chip 115 controls the on/off of the ac input terminal 113 according to the final voltage.
In one or more examples, the signal modulation circuit 122 includes a filter circuit and a follower circuit, wherein the filter circuit is configured to filter the voltage regulation signal; the follower circuit is used for increasing the current value of the voltage regulating signal filtered by the filter circuit. The filter circuit is, for example, a second-order RC filter circuit used in fig. 2, and the follower circuit is, for example, a voltage follower used in fig. 2.
Specifically, as shown in fig. 3, the filter circuit includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. One end of the first resistor R1 is connected to the voltage regulating chip 121. One end of the second resistor R2 is connected to the other end of the first resistor R1. One end of the first capacitor C1 is connected to a node between the first resistor R1 and the second resistor R2, and the other end of the first capacitor C1 is grounded. One end of the second capacitor C2 is connected to the other end of the second resistor R2, and the other end of the second capacitor C2 is grounded. In this example, a second-order filter circuit shown in fig. 3 is used for filtering the voltage-modulated signal, and the second-order filter circuit has the advantage of smaller ripple of filtering compared with a first-order RC filter circuit, so that the filtering effect of the voltage-modulated signal is improved. Of course, the second order filter circuit shown in fig. 3 is merely exemplary, and in other examples, a first order RC filter circuit may be used.
As shown in fig. 3 in conjunction with fig. 2, the follower circuit includes an operational amplifier having a forward input connected to the node between the second resistor R2 and the second capacitor C2, an output connected to the voltage acquisition circuit 112, and an output connected to an inverting input of the operational amplifier.
The switching power supply of the embodiment of the utility model converts the input commercial power (i.e. AC alternating current) into weak direct current voltage (i.e. direct current). The commercial power is filtered, rectified and filtered by the power circuit 110 to generate a high voltage dc voltage to the primary coil of the transformer 111, and the high voltage dc voltage is reduced by the transformer 111 to become a secondary low voltage dc voltage (i.e., the voltage at the dc output terminal 114). The power chip 115 obtains the voltage value outputted from the dc output terminal 114, and then adjusts the on-off time of the switch of the strong current circuit (i.e. the on-off time of the ac input terminal 113) to stabilize the voltage value outputted from the dc output terminal 114.
The voltage regulation process of the voltage regulation circuit 120 is as follows: the single chip microcomputer changes the voltage value after second-order RC filtering by adjusting the duty ratio of the sent PWM wave, the voltage value output by the voltage follower is used as an external signal of the switching power supply and is led to the voltage acquisition point of the voltage acquisition circuit 112 (namely the voltage division point of the resistor R5 and the resistor R6), so that the voltage at the voltage acquisition point is actively changed, since the voltage of the reference voltage (vref) of the comparator in the voltage acquisition circuit 112 is constant, the changed voltage (i.e.: final voltage) is fed back to the power supply chip 115 through the operational amplifier and the isolation optocoupler, the power supply chip 115 adjusts the output voltage of the direct current output end 114 according to the final voltage, and finally the switching power supply stably outputs the voltage.
In the above description, a second-order filter circuit is used, which has an advantage of smaller filtered ripple compared to a first-order RC filter circuit. In addition, the voltage follower can increase the current output value, thereby preventing the work of voltage regulation caused by insufficient current output of the PWM port of the singlechip.
According to the utility model discloses switching power supply can change switching power supply's the direct current's of output voltage value through voltage regulating circuit output adjustable voltage regulation signal initiatively, from this, can ensure that switching power supply output's voltage is normal and stable, promotes switching power supply's intelligent degree and the reliability of power supply.
Switching power supply, still include: the feedback circuit 130 and the feedback circuit 130 are respectively connected to the dc output terminal 114 and the voltage regulating chip 121, so as to feed back the voltage of the dc output terminal 114 to the voltage regulating chip 121, and the voltage regulating chip 121 monitors the voltage of the dc output terminal 114. In a specific example, as shown in fig. 2, the feedback circuit 130 includes a resistor R3 and a resistor R4, and the voltage regulating chip 121 monitors the voltage of the dc output terminal 114 by collecting the voltage at the node between the resistor R3 and the resistor R4 to determine whether there is an abnormality in the output voltage of the switching power supply. Namely: in order to ensure that the introduced external voltage regulating signal does not cause the switching power supply to be out of control, the output voltage collected by the feedback circuit 130 is monitored, so that the output voltage is prevented from being abnormal.
In one embodiment of the present invention, the voltage regulating chip 121 is connected to the ac input terminal 113 through a first voltage stabilizing circuit (i.e. the voltage stabilizing circuit on the left side of the single chip shown in fig. 2), and the ac input terminal 113 supplies power to the voltage regulating chip 121 through the first voltage stabilizing circuit, that is: providing an operating voltage for the voltage regulating chip 121.
Further, the embodiment of the utility model discloses an electrical equipment, include: a switching power supply according to any one of the embodiments described above. The electrical appliance is, but not limited to, a refrigerator. The switching power supply in the electrical equipment can actively output the adjustable voltage regulating signal through the voltage regulating circuit to change the voltage value of the direct current output by the switching power supply, so that the voltage output by the switching power supply can be ensured to be normal and stable, the intelligent degree of the switching power supply and the reliability of power supply are improved, and the electrical equipment is ensured to operate safely and reliably.
In addition, other configurations and functions of the electrical apparatus according to the embodiment of the present invention are known to those skilled in the art, and are not described herein.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.
Claims (10)
1. A switching power supply, comprising:
the power supply circuit comprises a transformer, a voltage acquisition circuit, an alternating current input end, a direct current output end and a power supply chip, wherein the alternating current input end, the direct current output end and the power supply chip are respectively connected with the transformer;
the voltage regulating circuit comprises a voltage regulating chip and a signal modulating circuit, the voltage regulating chip sends a voltage regulating signal to the voltage collecting circuit through the signal modulating circuit,
the voltage acquisition circuit acquires the voltage regulating signal and the voltage of the direct current output end and feeds back the final voltage to the power supply chip, and the power supply chip controls the on-off of the alternating current input end according to the final voltage.
2. The switching power supply according to claim 1, wherein the voltage regulating chip is a single chip microcomputer, the single chip microcomputer outputs an adjustable PWM signal, and the PWM signal passes through the signal modulation circuit and then is output to the voltage acquisition circuit.
3. The switching power supply according to claim 1 or 2, wherein the signal modulation circuit comprises:
the filter circuit is used for filtering the voltage regulating signal;
a follower circuit that increases a current value of the voltage regulation signal filtered by the filter circuit.
4. The switching power supply according to claim 3, wherein the filter circuit comprises:
one end of the first resistor is connected with the voltage regulating chip;
one end of the second resistor is connected with the other end of the first resistor;
one end of the first capacitor is connected with a node between the first resistor and the second resistor, and the other end of the first capacitor is grounded;
and one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is grounded.
5. The switching power supply according to claim 4, wherein the follower circuit comprises:
and the positive input end of the operational amplifier is connected with a node between the second resistor and the second capacitor, the output end of the operational amplifier is connected with the voltage acquisition circuit, and the output end of the operational amplifier is connected with the reverse input end of the operational amplifier.
6. The switching power supply according to claim 1 or 2, further comprising:
and the feedback circuit is respectively connected with the direct current output end and the voltage regulating chip so as to feed the voltage of the direct current output end back to the voltage regulating chip, and the voltage regulating chip monitors the voltage of the direct current output end.
7. The switching power supply according to claim 1, wherein said regulator chip is connected to said ac input terminal via a first regulator circuit, said ac input terminal supplying power to said regulator chip via said first regulator circuit.
8. The switching power supply according to claim 1 or 2, wherein a primary winding of the transformer is connected to the ac input terminal, a first secondary winding of the transformer is connected to the dc output terminal, and a second secondary winding of the transformer supplies power to the power supply chip.
9. An electrical device, comprising: a switching power supply according to any one of claims 1 to 8.
10. The electrical appliance of claim 9, wherein the electrical appliance is a refrigerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021283714.5U CN212695913U (en) | 2020-07-03 | 2020-07-03 | Switching power supply and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021283714.5U CN212695913U (en) | 2020-07-03 | 2020-07-03 | Switching power supply and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212695913U true CN212695913U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021283714.5U Active CN212695913U (en) | 2020-07-03 | 2020-07-03 | Switching power supply and electrical equipment |
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| Country | Link |
|---|---|
| CN (1) | CN212695913U (en) |
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- 2020-07-03 CN CN202021283714.5U patent/CN212695913U/en active Active
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