CN212627692U - Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer - Google Patents
Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer Download PDFInfo
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- CN212627692U CN212627692U CN202021701424.8U CN202021701424U CN212627692U CN 212627692 U CN212627692 U CN 212627692U CN 202021701424 U CN202021701424 U CN 202021701424U CN 212627692 U CN212627692 U CN 212627692U
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Abstract
The utility model provides a multichannel output isolation non-stabilized voltage power supply circuit based on an isolation transformer, which is characterized by comprising a transformer driving chip, at least two isolation transformers and an isolation filter circuit corresponding to the isolation transformers; the transformer driving chip at least comprises a power input pin, a first driving output pin, a second driving output pin and a grounding pin; the at least two isolation transformers are connected in parallel between a first driving output pin and a second driving output pin of the transformer driving chip; each isolation transformer outputs voltage through the isolation filter circuit to supply power for the post-stage circuit. The utility model discloses a non-constant voltage power supply circuit is kept apart to multiplexed output based on isolation transformer uses a plurality of isolation transformer of transformer driver chip collocation, and every isolation transformer's secondary limit output keeps apart non-steady voltage all the way. The utility model discloses transformer driver chip's quantity has been reduced to customer's use cost has been reduced.
Description
Technical Field
The utility model relates to a power transform technical field, in particular to non-constant voltage power supply circuit is kept apart to multiplexed output based on isolation transformer.
Background
In the application field of the existing isolation transformer, a micro-power transformer driving chip and an isolation non-stabilized voltage power supply which is combined with the isolation transformer to form a single-path output are generally adopted. The single-output isolated non-stabilized voltage power supply is mainly applied to occasions where a group of outputs and inputs need to be isolated in a distributed power supply system on a circuit board so as to achieve safety and/or interference resistance. The primary side and the secondary side of the isolation transformer have isolation withstand voltage of more than 1500VDC, and can be subjected to long-term short-circuit protection and self-recovery. However, the isolated non-regulated power supply with single output is not suitable for the application requiring multiple outputs. When multiple isolated voltages need to be output, a plurality of isolated non-stabilized power supplies driven by the combination of the micro-power transformer driving chip and the isolation transformer are needed, and therefore the use cost of customers is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a non-constant voltage power supply circuit is kept apart to multiplexed output based on isolation transformer can solve among the prior art because need export multichannel isolation voltage and lead to the problem that use cost increases.
The utility model aims at realizing through the following technical scheme:
the multi-output isolation non-stabilized voltage power supply circuit based on the isolation transformer comprises a transformer driving chip, at least two isolation transformers and an isolation filter circuit corresponding to the isolation transformers; the transformer driving chip at least comprises a power input pin, a first driving output pin, a second driving output pin and a grounding pin; the at least two isolation transformers are connected in parallel between a first driving output pin and a second driving output pin of the transformer driving chip; each isolation transformer outputs voltage through the isolation filter circuit to supply power for the post-stage circuit.
Furthermore, the isolation transformer comprises a primary winding and a secondary winding, wherein the homonymous end of the primary winding is connected with the first driving output pin, and the synonym end of the primary winding is connected with the second driving output pin; the center tap of the primary winding is connected with the power input pin; the homonymous end of the secondary winding is connected with the first input end of the isolation filter circuit, the heteronymous end of the secondary winding is connected with the second input end of the isolation filter circuit, and the center tap of the secondary winding is grounded.
Furthermore, the isolation filter circuit comprises a first diode, a second diode and a first capacitor; the anode of the first diode is used as the first input end of the isolation filter circuit, the anode of the second diode is used as the second input end of the isolation filter circuit, the cathode of the first diode is connected with the cathode of the second diode and is used as the output end of the isolation filter circuit, and the first capacitor is connected between the output end of the isolation filter circuit and the ground; and the voltage at the output end of the isolation filter circuit and the two ends of the ground is the supply voltage of the post-stage circuit.
Further, the at least two isolation transformers may be the same or different.
The utility model discloses a non-constant voltage power supply circuit is kept apart to multiplexed output based on isolation transformer uses a plurality of isolation transformer of transformer driver chip collocation, and every isolation transformer's secondary limit output keeps apart non-steady voltage all the way. The utility model discloses transformer driver chip's quantity has been reduced to customer's use cost has been reduced.
Drawings
Fig. 1 is a schematic diagram of a multi-output isolated non-stabilized power supply circuit based on an isolation transformer according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit of a multi-output isolated non-stabilized power supply based on an isolation transformer according to the second embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The utility model discloses a non-constant voltage power supply circuit is kept apart to multiplexed output based on isolation transformer to two tunnel outputs, isolation transformer are the push-pull transformer and explain as the example, as shown in FIG. 1, including a transformer driver chip IC, two isolation transformer T1 and T2. The transformer driving chip IC is provided with a power input pin VIN, a first driving output pin VD1, a second driving output pin VD2, and a ground pin GND. The isolation transformers T1 and T2 are connected in parallel between the first drive output pin VD1 and the second drive output pin VD2 of the transformer drive chip. The isolation transformers T1 and T2 each supply power to the subsequent stage circuit through an isolation filter circuit output voltage.
Further, in the preferred embodiment of the present invention, the push-pull converter T1 or T2 includes a primary winding and a secondary winding, the dotted end of the primary winding is connected to the first driving output pin VD1 of the transformer driving chip, the dotted end of the primary winding is connected to the second driving output pin VD2, and the center of the primary winding is tapped to be connected to the power input pin VIN of the transformer driving chip. The same-name end of the secondary winding is connected with the first input end of the isolation filter circuit, the different-name end of the secondary winding is connected with the second input end of the isolation filter circuit, and a center tap of the secondary winding is grounded.
Further, in a preferred embodiment of the present invention, the isolation filter circuit includes a first diode D11 (or D12), a second diode D12 (or D22), and a first capacitor C1 (or C2). An anode of the first diode D11 serves as a first input terminal of the isolation filter circuit, an anode of the second diode D12 serves as a second input terminal of the isolation filter circuit, a cathode of the first diode D11 and a cathode of the second diode D12 are connected as an output terminal of the isolation filter circuit, and the first capacitor C1 is connected between the output terminal of the isolation filter circuit and the ground. And the voltage between the output end of the isolation filter circuit and the two ends of the ground is the supply voltage of the post-stage circuit. R1 and R2 in fig. 1 are loads. C1 and C2 are filter capacitors.
The isolation filter circuit is not limited to this, and the isolation filter circuit of each push-pull converter secondary side may be the same or different. The replacement of the isolation filter circuit in the present embodiment by using other existing isolation filter circuits in the field falls within the protection scope of the present invention.
Further, in the preferred embodiment of the present invention, the isolation transformers T1 and T2 may or may not be identical. That is, the turn ratio of the primary and secondary windings of T1 may or may not be the same as the turn ratio of the primary and secondary windings of T2. If the two paths of output voltages are required to be the same, two identical isolation transformers are used. If two paths of output voltages are required to be different, two different isolation transformers are used.
The utility model discloses a theory of operation does: the transformer driving chip outputs driving voltage from a driving output pin VD1/VD2, and the driving voltage is respectively converted by an isolation transformer T1 and an isolation transformer T2, and is filtered by an isolation filter circuit to output two paths of voltage to supply power for two load circuits at the later stage.
The utility model discloses an isolation transformer is not limited to push-pull transformer, and other equivalents are substituted, all are within the utility model discloses a protection scope. For example, transformer driver chip adopts the full-bridge chip, and isolation transformer adopts the full-bridge transformer, and its function of realizing is the same with the utility model discloses the function that push-pull chip + push-pull transformer realized of embodiment one, and this kind of replacement belongs to and equates the replacement.
Example two
The second embodiment is an improvement on the basis of the first embodiment, the first embodiment has only two paths of output, and the second embodiment is expanded into multi-path output. As shown in fig. 2, the transformer driving circuit includes a transformer driving chip IC, and n isolation transformers T1, T2.. Tn. The n isolation transformers are connected in parallel between the first drive output pin VD1 and the second drive output pin VD2 of the transformer drive chip. The n isolation transformers respectively output voltage through an isolation filter circuit to supply power to the post-stage circuit.
In this embodiment, the circuit connection relationship and the working principle inside each isolation transformer are the same as those in the first embodiment, and the isolation filter circuit in this embodiment is also the same as that in the first embodiment, which is not described herein again.
The above embodiments are merely illustrative, and not intended to limit the present invention, and those skilled in the art should understand that any modification, equivalent replacement, or improvement without creative work within the spirit and principle of the present invention, such as replacing the push-pull transformer with a full-bridge transformer, should be included in the protection scope of the present invention.
Claims (4)
1. The multi-output isolation non-stabilized voltage power supply circuit based on the isolation transformer is characterized by comprising a transformer driving chip, at least two isolation transformers and an isolation filter circuit corresponding to the isolation transformers; the transformer driving chip at least comprises a power input pin, a first driving output pin, a second driving output pin and a grounding pin; the at least two isolation transformers are connected in parallel between a first driving output pin and a second driving output pin of the transformer driving chip; each isolation transformer outputs voltage through the isolation filter circuit to supply power for the post-stage circuit.
2. The multi-output isolation non-stabilized voltage power supply circuit based on the isolation transformer as claimed in claim 1, wherein the isolation transformer comprises a primary winding and a secondary winding, the homonymous terminal of the primary winding is connected to the first driving output pin, and the synonym terminal of the primary winding is connected to the second driving output pin; the center tap of the primary winding is connected with the power input pin; the homonymous end of the secondary winding is connected with the first input end of the isolation filter circuit, the heteronymous end of the secondary winding is connected with the second input end of the isolation filter circuit, and the center tap of the secondary winding is grounded.
3. The isolated transformer-based multi-output isolated regulated power supply circuit of claim 1 wherein said isolation filter circuit comprises a first diode, a second diode, a first capacitor; the anode of the first diode is used as the first input end of the isolation filter circuit, the anode of the second diode is used as the second input end of the isolation filter circuit, the cathode of the first diode is connected with the cathode of the second diode and is used as the output end of the isolation filter circuit, and the first capacitor is connected between the output end of the isolation filter circuit and the ground; and the voltage at the output end of the isolation filter circuit and the two ends of the ground is the supply voltage of the post-stage circuit.
4. The isolated transformer-based multi-output isolated regulated power supply of claim 1 wherein said at least two isolation transformers are the same or different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021701424.8U CN212627692U (en) | 2020-08-16 | 2020-08-16 | Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021701424.8U CN212627692U (en) | 2020-08-16 | 2020-08-16 | Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer |
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| CN212627692U true CN212627692U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065421A (en) * | 2022-05-27 | 2022-09-16 | 广州致远电子有限公司 | Double-path isolation output rectifying circuit, interface circuit board and electrical equipment |
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2020
- 2020-08-16 CN CN202021701424.8U patent/CN212627692U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065421A (en) * | 2022-05-27 | 2022-09-16 | 广州致远电子有限公司 | Double-path isolation output rectifying circuit, interface circuit board and electrical equipment |
| CN115065421B (en) * | 2022-05-27 | 2024-05-17 | 广州致远电子股份有限公司 | Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment |
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