CN213426033U - Switching power supply circuit and device of parallel low-voltage input capacitor - Google Patents
Switching power supply circuit and device of parallel low-voltage input capacitor Download PDFInfo
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- CN213426033U CN213426033U CN202022664794.5U CN202022664794U CN213426033U CN 213426033 U CN213426033 U CN 213426033U CN 202022664794 U CN202022664794 U CN 202022664794U CN 213426033 U CN213426033 U CN 213426033U
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Abstract
The utility model discloses a parallelly connected low pressure input capacitance's switching power supply circuit and device, include: the device comprises an input high-voltage capacitor, an input low-voltage capacitor, a first resistor, a second resistor, a third resistor, a voltage detection control module, a switching tube, a rectifier bridge and a transformer; the transformer is used for inputting AC voltage, the transformer is electrically connected with the rectifier bridge, the rectifier bridge is electrically connected with the first end of the input high-voltage capacitor, the switch tube, the voltage detection control module and the first end of the first resistor, the rectifier bridge is electrically connected with the second end of the input high-voltage capacitor, the first end of the input low-voltage capacitor and the first end of the second resistor, the second end of the input low-voltage capacitor is electrically connected with the switch tube, the switch tube is electrically connected with the voltage detection control module, the voltage detection control module is electrically connected with the second end of the first resistor and the first end of the third resistor, and the second end of the third resistor is electrically connected with the second end of the second resistor. The utility model discloses can reduce switching power supply loss, raise the efficiency, the circuit is simple and low cost.
Description
Technical Field
The utility model relates to a switching power supply control technical field especially relates to a parallelly connected low pressure input capacitance's switching power supply circuit and device.
Background
Conventional switching power supplies use smaller transformers by increasing the switching frequency, thereby reducing the size of the power supply. In addition, the electrolytic capacitor of the conventional switching power supply is bulky, occupies a large part of the internal volume, often limits the external dimension selection of the design of the adapter, and has complex circuit and high cost. Therefore, the invention of a switching power supply circuit with high reliability and parallel low-voltage input capacitors is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a parallelly connected low pressure input capacitance's switching power supply circuit and device.
In a first aspect, the utility model discloses a switching power supply circuit of parallel low-voltage input capacitor, which comprises an input high-voltage capacitor, an input low-voltage capacitor, a first resistor, a second resistor, a third resistor, a voltage detection control module, a switching tube, a rectifier bridge and a transformer; the first end and the second end of the transformer are used for inputting AC voltage, the third end of the transformer is electrically connected with the first end of the rectifier bridge, the fourth end of the transformer is electrically connected with the second end of the rectifier bridge, the third end of the rectifier bridge is respectively electrically connected with the first end of the input high-voltage capacitor, the first end of the switch tube, the first end of the voltage detection control module and the first end of the first resistor, the fourth end of the rectifier bridge is respectively electrically connected with the second end of the input high-voltage capacitor, the first end of the input low-voltage capacitor and the first end of the second resistor, the second end of the input low-voltage capacitor is electrically connected with the second end of the switch tube, the third end of the switch tube is electrically connected with the second end of the voltage detection control module, and the third end of the voltage detection control module is electrically connected with an input power supply, and the fourth end of the voltage detection control module is respectively electrically connected with the second end of the first resistor and the first end of the third resistor, and the second end of the third resistor is electrically connected with the second end of the second resistor.
Preferably, the voltage detection control module is implemented by an operational amplifier.
Preferably, the voltage detection control module is implemented by a comparator.
Preferably, the voltage detection control module is implemented by an editable logic device.
Preferably, the switch tube is a metal oxide semiconductor field effect transistor MOSFET or an insulated gate bipolar transistor IGBT.
In a second aspect, the present invention discloses an apparatus, including the first aspect, a switching power supply circuit for a parallel low-voltage input capacitor.
The utility model discloses a switching power supply circuit of parallelly connected low pressure input electric capacity has following beneficial effect, the utility model discloses a switching power supply circuit of parallelly connected low pressure input electric capacity includes: the device comprises an input high-voltage capacitor, an input low-voltage capacitor, a first resistor, a second resistor, a third resistor, a voltage detection control module, a switching tube, a rectifier bridge and a transformer; the first end and the second end of the transformer are used for inputting AC voltage, the third end of the transformer is electrically connected with the first end of the rectifier bridge, the fourth end of the transformer is electrically connected with the second end of the rectifier bridge, the third end of the rectifier bridge is respectively electrically connected with the first end of the input high-voltage capacitor, the first end of the switch tube, the first end of the voltage detection control module and the first end of the first resistor, the fourth end of the rectifier bridge is respectively electrically connected with the second end of the input high-voltage capacitor, the first end of the input low-voltage capacitor and the first end of the second resistor, the second end of the input low-voltage capacitor is electrically connected with the second end of the switch tube, the third end of the switch tube is electrically connected with the second end of the voltage detection control module, and the third end of the voltage detection control module is electrically connected with an input power supply, and the fourth end of the voltage detection control module is respectively electrically connected with the second end of the first resistor and the first end of the third resistor, and the second end of the third resistor is electrically connected with the second end of the second resistor. When the input alternating voltage is lower than the preset alternating voltage threshold value, the switching tube is controlled to be conducted, and the power supply distributes most of stored energy to the water low-voltage capacitor, so that the loss is reduced to the maximum extent, and the efficiency of the whole machine is improved; and when the input alternating voltage is higher than the preset alternating voltage threshold value, the switching tube is controlled to be switched off, the power supply distributes the stored energy to the input high-voltage capacitor, and the input high-voltage capacitor supports the output of the power supply. Therefore, the utility model discloses can effectively reduce switching power supply's loss, raise the efficiency, the circuit is simple and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein 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 without inventive efforts according to the drawings:
fig. 1 is a circuit diagram of a switching power supply circuit of a parallel low-voltage input capacitor according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention.
Example one
The preferred embodiment of the present invention is shown in fig. 1, which includes an input high voltage capacitor C1, an input low voltage capacitor C2, a first resistor R3, a second resistor R1, a third resistor R2, a voltage detection control module U1, a switch tube Q1, a rectifier bridge BD1 and a transformer LF 1; the first end and the second end of the transformer LF1 are used for inputting AC alternating voltage, the third end of the transformer LF1 is electrically connected with the first end of the rectifier bridge BD1, the fourth end of the transformer LF1 is electrically connected with the second end of the rectifier bridge BD1, the third end of the rectifier bridge BD1 is electrically connected with the first end of the input high-voltage capacitor C1, the first end of the switch tube Q1, the first end of the voltage detection control module U1 and the first end of the first resistor R3, the fourth end of the rectifier bridge BD1 is electrically connected with the second end of the input high-voltage capacitor C1, the first end of the input low-voltage capacitor C2 and the first end of the second resistor R1, the second end of the input low-voltage capacitor C2 is electrically connected with the second end of the switch tube Q1, and the third end of the switch tube Q1 is electrically connected with the second end of the voltage detection control module U1, a third end of the voltage detection control module U1 is electrically connected to an input power source, a fourth end of the voltage detection control module U1 is electrically connected to a second end of the first resistor R3 and a first end of the third resistor R2, respectively, and a second end of the third resistor R2 is electrically connected to a second end of the second resistor R1. When the input alternating voltage is lower than the preset alternating voltage threshold value, the switching tube Q1 is controlled to be conducted, and the power supply distributes most of stored energy to the water low-voltage capacitor, so that the loss is reduced to the maximum extent, and the efficiency of the whole machine is improved; when the input alternating voltage is higher than the preset alternating voltage threshold value, the switching tube Q1 is controlled to be turned off, the power supply distributes stored energy to the input high-voltage capacitor C1, and the input high-voltage capacitor C1 supports the output of the power supply in working. Therefore, the utility model discloses can effectively reduce switching power supply's loss, raise the efficiency, the circuit is simple and low cost.
Preferably, the voltage detection control module detects an input alternating-current voltage, and controls the switching tube Q1 to be turned on when the input alternating-current voltage is lower than a preset alternating-current voltage threshold; and when the input alternating voltage is higher than the preset alternating voltage threshold value, the switching tube Q1 is controlled to be turned off. In the present embodiment, the predetermined ac voltage threshold is 132 Vac. In addition, the capacity of the input high-voltage capacitor C1 is 0.5 uF; the capacity of the input low-voltage capacitor C2 is 1.5 uF. In an embodiment, the input high-voltage capacitor C1 has a capacity of 400V, and the input low-voltage capacitor C2 has a capacity of 200V.
Preferably, the voltage detection control module U1 is implemented by an operational amplifier.
Preferably, the voltage detection control module U1 is implemented by a comparator.
Preferably, the voltage detection control module U1 is implemented by an editable logic device.
Specifically, in this embodiment, the formula of the ac voltage input by the voltage detection control module U1 is as follows: vac Vin _ sen (R1+ R2+ R3)/R3/1.414
Wherein Vin _ sen is the voltage of the detection pin of the voltage detection unit, and Vac is the input alternating voltage value;
(R1+ R2+ R3) is a detection pin resistance of the voltage detection unit;
vin _ sen)/R3/1.414 is the effective current value of the detection pin of the voltage detection unit.
Preferably, the switching tube Q1 is a metal oxide semiconductor field effect transistor MOSFET or an insulated gate bipolar transistor IGBT.
Example two
The utility model discloses a device, including embodiment one switching power supply circuit of parallelly connected low pressure input capacitance.
To sum up, the utility model provides a parallelly connected low pressure input capacitance's switching power supply circuit includes input high voltage capacitor C1, input low voltage capacitor C2, first resistance R3, second resistance R1, third resistance R2, voltage detection control module U1, switch tube Q1, rectifier bridge BD1 and transformer LF 1; when the input alternating voltage is lower than the preset alternating voltage threshold value, the switching tube Q1 is controlled to be conducted, and the power supply distributes most of stored energy to the water low-voltage capacitor, so that the loss is reduced to the maximum extent, and the efficiency of the whole machine is improved; when the input alternating voltage is higher than the preset alternating voltage threshold value, the switching tube Q1 is controlled to be turned off, the power supply distributes stored energy to the input high-voltage capacitor C1, and the input high-voltage capacitor C1 supports the output of the power supply in working. Therefore, the utility model discloses can effectively reduce switching power supply's loss, raise the efficiency, the circuit is simple and low cost.
The switching power supply circuit and the device of the parallel low-voltage input capacitor provided by the present invention are introduced in detail, and the principle and the implementation mode of the present invention are explained by applying specific examples, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, to the general technical personnel in this field, according to the utility model discloses an idea, all can have the change part on concrete implementation and application scope, to sum up, this description content only is the utility model discloses an embodiment, does not consequently restrict the utility model discloses a patent scope, all utilize the equivalent structure or the equivalent flow transform that the content of the description and the attached drawing did, or directly or indirectly use in other relevant technical fields, all the same reason is included in the utility model discloses a patent protection scope. And should not be construed as limiting the invention.
Claims (6)
1. A switching power supply circuit connected in parallel with a low voltage input capacitor, comprising: the device comprises an input high-voltage capacitor, an input low-voltage capacitor, a first resistor, a second resistor, a third resistor, a voltage detection control module, a switching tube, a rectifier bridge and a transformer; the first end and the second end of the transformer are used for inputting AC voltage, the third end of the transformer is electrically connected with the first end of the rectifier bridge, the fourth end of the transformer is electrically connected with the second end of the rectifier bridge, the third end of the rectifier bridge is respectively electrically connected with the first end of the input high-voltage capacitor, the first end of the switch tube, the first end of the voltage detection control module and the first end of the first resistor, the fourth end of the rectifier bridge is respectively electrically connected with the second end of the input high-voltage capacitor, the first end of the input low-voltage capacitor and the first end of the second resistor, the second end of the input low-voltage capacitor is electrically connected with the second end of the switch tube, the third end of the switch tube is electrically connected with the second end of the voltage detection control module, and the third end of the voltage detection control module is electrically connected with an input power supply, and the fourth end of the voltage detection control module is respectively electrically connected with the second end of the first resistor and the first end of the third resistor, and the second end of the third resistor is electrically connected with the second end of the second resistor.
2. The switching power supply circuit connected in parallel with the low-voltage input capacitor as claimed in claim 1, wherein the voltage detection control module is implemented by an operational amplifier.
3. The switching power supply circuit connected in parallel with the low-voltage input capacitor as claimed in claim 1, wherein the voltage detection control module is implemented by a comparator.
4. The switching power supply circuit connected in parallel with the low-voltage input capacitor as claimed in claim 1, wherein the voltage detection control module is implemented by an editable logic device.
5. The switching power supply circuit connected in parallel with the low-voltage input capacitor as claimed in claim 1, wherein the switching tube is a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT).
6. An apparatus comprising a switched mode power supply circuit in parallel with a low voltage input capacitor as claimed in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022664794.5U CN213426033U (en) | 2020-11-17 | 2020-11-17 | Switching power supply circuit and device of parallel low-voltage input capacitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022664794.5U CN213426033U (en) | 2020-11-17 | 2020-11-17 | Switching power supply circuit and device of parallel low-voltage input capacitor |
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| CN213426033U true CN213426033U (en) | 2021-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311259A (en) * | 2020-11-17 | 2021-02-02 | 深圳市雅晶源科技有限公司 | Switching power supply circuit with parallel low-voltage input capacitors and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311259A (en) * | 2020-11-17 | 2021-02-02 | 深圳市雅晶源科技有限公司 | Switching power supply circuit with parallel low-voltage input capacitors and control method |
| CN112311259B (en) * | 2020-11-17 | 2025-01-03 | 深圳市雅晶源科技有限公司 | A switching power supply circuit and control method for parallel low-voltage input capacitor |
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