CN219420582U - Time-sharing starting circuit of multipath DC-DC switching power supply - Google Patents
Time-sharing starting circuit of multipath DC-DC switching power supply Download PDFInfo
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- CN219420582U CN219420582U CN202223547140.XU CN202223547140U CN219420582U CN 219420582 U CN219420582 U CN 219420582U CN 202223547140 U CN202223547140 U CN 202223547140U CN 219420582 U CN219420582 U CN 219420582U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a time-sharing starting circuit of a multipath DC-DC switching power supply, which comprises a plurality of DC-DC switching power supply modules which are sequentially connected in series, wherein each DC-DC switching power supply module comprises an enabling input end, the enabling input ends of the first-stage DC-DC switching power supply module are connected with a power supply, the enabling input ends of the other DC-DC switching power supply modules are connected with a starting enabling module which can enable the starting of the starting enabling module, and each starting enabling module sets the starting enabling voltage of a lower-stage DC-DC switching power supply module according to the output voltage value of a previous-stage DC-DC switching power supply module and controls the starting and the starting of the lower-stage DC-DC switching power supply module. The DC-DC power supply modules of the time-sharing starting switch power supply are realized, so that the starting current of the whole switch power supply is reduced.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a time-sharing starting circuit of a multipath DC-DC switching power supply.
Background
With the rapid development of the semiconductor industry, various semiconductor devices are widely used in various control systems. Different types of semiconductor devices have different power supply requirements, and often a plurality of direct current power supply requirements, such as 5V, 2.8V, 1.8V, 1.2V, 0.9V and the like, exist in one low-voltage control system, and under no special condition, all power supply modules can be powered on simultaneously. However, under the condition that the power supply has current limitation on the load, all power supply modules are electrified simultaneously, so that surge current is overlarge, overload protection is caused for the power supply, and the power supply cannot be used.
Disclosure of Invention
The utility model provides a time-sharing starting circuit of a multipath DC-DC switching power supply, which reduces the starting current of the whole switching power supply by time-sharing starting each DC-DC power supply module of the switching power supply.
The technical scheme of the utility model is as follows:
a multipath DC-DC switching power supply time-sharing starting circuit is characterized in that: the power supply system comprises a plurality of DC-DC switch power supply modules which are sequentially connected in series and are respectively provided with a starting voltage threshold, each DC-DC switch power supply module comprises an enabling input end, the enabling input ends of the first-stage DC-DC switch power supply module are connected with a power supply, the enabling input ends of the rest DC-DC switch power supply modules are connected with a starting enabling module, the power supply end of each starting enabling module is connected with the voltage output end of the previous-stage DC-DC switch power supply module, the output end of each starting enabling module is connected with the output end of the next-stage DC-DC switch power supply module, and each starting enabling module is used for setting the starting enabling voltage of the next-stage DC-DC switch power supply module according to the output voltage value of the previous-stage DC-DC switch power supply module and controlling the starting and stopping of the next-stage DC-DC switch power supply module.
Further, each start enabling module comprises a first resistor and a second resistor, a first end of the first resistor is connected with a power output end of the front-stage DC-DC switching power supply module, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is grounded, and a first end of the second resistor is further connected with an enabling input end of the lower-stage DC-DC switching power supply module.
Further, when the output voltage of the front stage DC-DC switching power supply module is configured to reach a certain threshold value of the rated voltage output, the voltage value output by the first end of the second resistor can enable the lower stage DC-DC switching power supply module by adjusting the resistance values of the first resistor and the second resistor, and the lower stage DC-DC switching power supply module is turned on.
Further, the threshold value is 90% of the rated voltage of the front-stage DC-DC switching power supply module.
A multipath DC-DC switching power supply time-sharing starting circuit is characterized in that: the power supply system comprises a plurality of DC-DC switching power supply modules, wherein the starting voltage threshold value is respectively set in the DC-DC switching power supply modules, the power supply input end of the first-stage DC-DC switching power supply module is connected with a power supply, each DC-DC switching power supply module is connected with a preceding-stage DC-DC module in series through a conduction control module, and the conduction control module controls the on-off of a lower-stage DC-DC switching power supply module according to the output voltage of the preceding-stage DC-DC switching power supply module.
The on control module comprises a first resistor, a second resistor, a first switching tube and a second switching tube, wherein the first end of the first resistor is connected with the output end of the front-stage DC-DC switching power supply module, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the first end of the second resistor is also connected with the opening control end of the first switching tube, the first end of two controlled conduction path ends of the first switching tube is connected with the control end of the second switching tube, the second end of the two controlled conduction path ends of the first switching tube is grounded, the first end of the two controlled conduction path ends of the second switching tube is connected with the front-stage DC-DC switching power supply module, the second end of the second switching tube is connected with the rear-stage DC-DC switching power supply module, and the on control module controls the opening of the rear-stage DC-DC switching power supply module when the output voltage of the front-stage DC-DC switching power supply module reaches a certain threshold value.
Further, the first switching tube adopts a triode, the base electrode of the triode is connected with the first end of the second resistor, the collector electrode of the triode is connected with the control end of the second switching tube, and the emitter electrode of the triode is grounded.
Further, the second switching tube adopts a PMOS tube, a grid electrode of the PMOS tube is connected with a first end of two controlled conduction path ends of the first switching tube, a source electrode of the PMOS tube is connected with the front-stage DC-DC switching power supply module, and a drain electrode of the PMOS tube is connected with the rear-stage DC-DC switching power supply module.
Further, a third resistor is further connected between the first switching tube and the second switching tube.
Further, the threshold value is 90% of the rated voltage of the front-stage DC-DC switching power supply module.
The technical scheme provided by some embodiments of the present application has the beneficial effects that at least includes:
(1) The plurality of DC-DC switch power supply modules are connected in series, the enabling input end of each DC-DC switch power supply module is connected with a starting enabling module, each starting enabling module sets the starting enabling voltage of the lower-stage DC-DC switch power supply module according to the output voltage value of the previous-stage DC-DC switch power supply module, the lower-stage DC-DC switch power supply module is controlled to be started and stopped, time-sharing starting of the plurality of DC-DC switch power supply modules can be achieved, and starting current of the whole switch power supply is reduced.
(2) The DC-DC switching power supply modules with the starting voltage threshold values are respectively set in series with the front-stage DC-DC modules through a conduction control module, and the conduction control module controls the on-off of the lower-stage DC-DC switching power supply modules according to the output voltage of the front-stage DC-DC switching power supply modules, so that the time-sharing starting of the DC-DC switching power supply modules is realized, and the starting current of the whole switching power supply is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a block diagram of a circuit configuration according to a first embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a first embodiment of the present utility model;
FIG. 3 is a block diagram of a circuit configuration of a second embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a second embodiment of the present utility model.
The following describes the embodiments of the present utility model in further detail with reference to the drawings.
Detailed Description
In describing embodiments of the present utility model in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the utility model. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present utility model. It should be noted that the connection mentioned in the present application may be a direct connection or an indirect connection.
Embodiment one: the utility model provides a multichannel DC-DC switching power supply timesharing starting circuit, including a plurality of DC-DC switching power supply modules that establish ties in proper order and have the starting voltage threshold value respectively, and every DC-DC switching power supply module all includes an enabling input, except that the power supply is connected to the enabling input of first level DC-DC switching power supply module, the enabling input of every other DC-DC switching power supply module all is connected with the starting enabling module that can enable its start, the voltage output of preceding level DC-DC switching power supply module is connected to the power supply end of every starting enabling module, the output of every starting enabling module is connected the output of next level DC-DC switching power supply module, every starting enabling module sets for the starting enabling voltage of next level DC-DC switching power supply module according to the output voltage value of preceding level DC-DC switching power supply module, the start-stop of control next level DC-DC switching power supply module.
As shown in fig. 1, three DC-DC switching power supply modules are listed in fig. 1, namely, a first DC-DC switching power supply module 1, a second switching power supply module 2 and a third switching power supply module 3, and in practical application, the DC-DC switching power supply modules are not limited to three, and the structures of the DC-DC switching power supply modules may be the same or different or partially the same, in this embodiment, the first stage DC-power supply module is a first stage DC-power-supply moduleThe enabling input end of each DC-DC switching power supply module is connected with a power supply, the enabling input end of each other DC-DC switching power supply module is connected with a starting enabling module which can enable the corresponding DC-DC switching power supply module to be started, the corresponding DC-DC switching power supply module can only work after the corresponding DC-DC switching power supply module is started by the starting enabling module, as shown in fig. 2, fig. 2 is a specific circuit schematic diagram of the circuit block diagram of fig. 1, wherein the first DC-DC switching power supply module 1, the second switching power supply module 2 and the third switching power supply module 3 in fig. 1 correspond to U1, U2 and U3 in fig. 2 respectively, and the output voltages are VCC1, VCC2 and VCC3 respectively. Referring to fig. 2, each of the start enable modules includes a first resistor and a second resistor, a first end of the first resistor is connected to a power output end of the pre-stage DC-DC switching power supply module, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is grounded, a second end of the second resistor is also connected to an enable input end of the next stage DC-DC switching power supply module, but resistance values of the first resistor and the second resistor of each stage can be adjusted according to actual conditions, and referring to fig. 2 again, in this embodiment, the first resistor connected between the first stage DC-DC switching power supply module and the second stage DC-DC switching power supply module is resistor R1, the second resistor is resistor R2, the first resistor connected between the second stage DC-DC switching power supply module and the third stage DC-DC switching power supply module is resistor R3, the second resistor is resistor R4, and an enable voltage input to the next stage DC-DC switching power supply module, for example, U, can be obtained by adjusting the resistance values of the first resistor and the second resistor 2 The enable pin voltage of (1) is obtained by dividing the voltage of the resistors R1 and R2: u (U) en ＝VCC1*(R2/R1+R2)。
In this embodiment, when the output voltage of the pre-stage DC-DC switching power supply module is configured to reach a certain threshold value of its rated voltage output, the voltage value output by the first end of the second resistor enables the lower stage DC-DC switching power supply module by adjusting the resistance values of the first resistor and the second resistor, and the lower stage DC-DC switching power supply module is turned on. In this embodiment, the threshold is preferably 90% of the rated voltage of the preceding stage DC-DC switching power supply module, that is, when VCC1 is set to 90% of the rated voltage, the values of R1 and R2 are selected to make U en Equal to U 2 Is set to the start-up enable voltage of (a). When VCC2 builds up to 90%, U3 is enabled to operate, and so on. The time-sharing starting of the whole power supply is realized, and the starting current of the whole power supply is reduced.
Embodiment two: a multi-path DC-DC switching power supply time-sharing starting circuit comprises a plurality of DC-DC switching power supply modules respectively provided with a starting voltage threshold, wherein the power input end of a first-stage DC-DC switching power supply module is connected with a power supply, each DC-DC switching power supply module is connected with a preceding-stage DC-DC module in series through a conduction control module, and the conduction control module controls the on-off of a lower-stage DC-DC switching power supply module according to the output voltage of the preceding-stage DC-DC switching power supply module.
As shown in fig. 3, three DC-DC switching power supply modules are listed in fig. 3, which are respectively a first DC-DC switching power supply module 1, a second switching power supply module 2 and a third switching power supply module 3, in practical application, the DC-DC switching power supply modules are not limited to the three DC-DC switching power supply modules, and the structures of the DC-DC switching power supply modules may be the same or different or partially the same, in this embodiment, the enabling input end of the first stage DC-DC switching power supply module is connected to the power supply, and each DC-DC switching power supply module is connected in series with the preceding stage DC-DC switching power supply module through a conduction control module with the same circuit structure, as shown in fig. 4, fig. 4 is a specific circuit schematic diagram of the circuit block diagram of fig. 3, where the first DC-DC switching power supply module 1, the second switching power supply module 2 and the third switching power supply module 3 in fig. 3 correspond to U1, U2 and U3 in fig. 4, and the output voltages are 1, VCC2 and VCC3, respectively.
In this embodiment, the on control module includes a first resistor, a second resistor, a first switch tube and a second switch tube, a first end of the first resistor is connected to an output end of the pre-stage DC-DC switching power supply module, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is grounded, a first end of the second resistor is further connected to an on control end of the first switch tube, a first end of two controlled conduction path ends of the first switch tube is connected to a control end of the second switch tube, a second end of two controlled conduction path ends of the first switch tube is grounded, a first end of two controlled conduction path ends of the second switch tube is connected to the pre-stage DC-DC switching power supply module, a second end of the second switch tube is connected to a post-stage DC-DC switching power supply module, and the on control module controls the on of the post-stage DC-DC switching power supply module when an output voltage of the pre-stage DC-DC switching power supply module reaches a certain threshold. In this embodiment, the first switching tube is a triode, a base electrode of the triode is connected to a first end of the second resistor, a collector electrode of the triode is connected to a control end of the second switching tube, and an emitter electrode of the triode is grounded.
The second switching tube adopts a PMOS tube, a grid electrode of the PMOS tube is connected with a first end of two controlled conduction path ends of the first switching tube, a source electrode of the PMOS tube is connected with the front-stage DC-DC switching power supply module, and a drain electrode of the PMOS tube is connected with the rear-stage DC-DC switching power supply module.
In this embodiment, a third resistor is further connected between the first switching tube and the second switching tube.
In this embodiment, a fourth resistor is further connected between the second end of the first resistor and the base of the first switching tube.
In the embodiment, a fifth resistor is further connected between the output end of the first DC-DC switching power supply module and the first end of the two controlled conduction path ends of the first switching tube,
referring to fig. 4, an exemplary conduction control module connected between the first stage DC-DC switching power supply module U1 and the second stage DC-DC switching power supply module U2 is described, and the conduction control module in the whole circuit may refer to the module design or may be different from the module, so long as the purpose of the present utility model can be achieved, and all the conduction control modules may be selectively adopted and are also included in the protection scope of the present utility model. Specifically, referring to fig. 4 in the conduction control module connected between the first stage DC-DC switching power supply module U1 and the second stage DC-DC switching power supply module U2, a first resistor in the conduction control module connected between the first stage DC-DC switching power supply module U1 and the second stage DC-DC switching power supply module U2 is a resistor R1, a second resistor is a resistor R2, a first switching tube is a switching tube Q1 and a second switching tube is a switching tube Q2, and a third resistor connected between the first switching tube and the second switching tube is a resistor R5. First stage DC-DC switching power supplyThe fourth resistor in the conduction control module connected between the module U1 and the second-stage DC-DC switching power supply module U2 is R3, and the fifth resistor in the conduction control module connected between the first-stage DC-DC switching power supply module U1 and the second-stage DC-DC switching power supply module U2 is R4. In the present embodiment, the base voltage Vb of the first switching transistor Q1 is obtained by dividing VCC by the resistor R1 and the resistor R2: vb=vcc 1 (R2/r1+r2), and when VCC1 reaches a certain threshold value, the second switching transistor Q2 is turned on by selecting the values of the resistor R1 and the resistor R2. Q1 is not on: gate-to-source voltage V gs =0, Q2 is non-conductive; after Q1 is turned on: v (V) gs |>On voltage V th Q2 is conducted; as a preferred way, the threshold may be, but is not limited to, 90% of the rated voltage of the pre-stage DC-DC switching power supply module. When the VCC1 set-up voltage reaches 90% →Q1 conduction→Q2 conduction, U2 starts to work, the VCC2 set-up voltage reaches 90% →Q3 conduction→Q4 conduction, and U3 starts to work. By the mode, time-sharing starting is realized, and starting current of the whole power supply is reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multipath DC-DC switching power supply time-sharing starting circuit is characterized in that: the power supply comprises a plurality of DC-DC switch power supply modules which are sequentially connected in series and are respectively provided with a starting voltage threshold, each DC-DC switch power supply module comprises an enabling input end, the enabling input ends of the first-stage DC-DC switch power supply module are connected with a power supply, the enabling input ends of the rest DC-DC switch power supply modules are connected with a starting enabling module which can enable the starting of the starting enabling module, the power end of each starting enabling module is connected with the voltage output end of the previous-stage DC-DC switch power supply module, the output end of each starting enabling module is connected with the output end of the next-stage DC-DC switch power supply module, and each starting enabling module is used for setting the starting enabling of the next-stage DC-DC switch power supply module according to the output voltage of the previous-stage DC-DC switch power supply module and controlling the starting and the starting of the next-stage DC-DC switch power supply module.
2. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 1, wherein: each starting enabling module comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with the power output end of the front-stage DC-DC switching power supply module, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, and the first end of the second resistor is also connected with the enabling input end of the lower-stage DC-DC switching power supply module.
3. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 2, wherein: when the output voltage of the front-stage DC-DC switching power supply module is configured to reach a certain threshold value of rated voltage output, the voltage value output by the first end of the second resistor enables the lower-stage DC-DC switching power supply module by adjusting the resistance values of the first resistor and the second resistor, and the lower-stage DC-DC switching power supply module is started.
4. A multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 3, wherein: the threshold value is 90% of rated voltage of the front-stage DC-DC switching power supply module.
5. A multipath DC-DC switching power supply time-sharing starting circuit is characterized in that: the power supply system comprises a plurality of DC-DC switching power supply modules, wherein the starting voltage threshold value is respectively set in the DC-DC switching power supply modules, the power supply input end of the first-stage DC-DC switching power supply module is connected with a power supply, each DC-DC switching power supply module is connected with a preceding-stage DC-DC module in series through a conduction control module, and the conduction control module controls the on-off of a lower-stage DC-DC switching power supply module according to the output voltage of the preceding-stage DC-DC switching power supply module.
6. The multi-path DC-DC switching power supply time-sharing start-up circuit of claim 5, wherein: the on control module comprises a first resistor, a second resistor, a first switching tube and a second switching tube, wherein the first end of the first resistor is connected with the output end of the front-stage DC-DC switching power supply module, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the first end of the second resistor is also connected with the opening control end of the first switching tube, the first end of two controlled conduction path ends of the first switching tube is connected with the control end of the second switching tube, the second end of the two controlled conduction path ends of the first switching tube is grounded, the first end of the two controlled conduction path ends of the second switching tube is connected with the front-stage DC-DC switching power supply module, the second end of the second switching tube is connected with the rear-stage DC-DC switching power supply module, and the on control module controls the opening of the rear-stage DC-DC switching power supply module when the output voltage of the front-stage DC-DC switching power supply module reaches a certain threshold value.
7. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 6, wherein: the first switching tube adopts the triode, the first end of second resistance is connected to the base of triode, the control end of second switching tube is connected to the collecting electrode of triode, the projecting pole ground connection of triode.
8. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 6, wherein: the second switching tube adopts a PMOS tube, a grid electrode of the PMOS tube is connected with a first end of two controlled conduction path ends of the first switching tube, a source electrode of the PMOS tube is connected with the front-stage DC-DC switching power supply module, and a drain electrode of the PMOS tube is connected with the rear-stage DC-DC switching power supply module.
9. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 6, wherein: and a third resistor is also connected between the first switching tube and the second switching tube.
10. The multi-path DC-DC switching power supply time-sharing start-up circuit as set forth in claim 6, wherein: the threshold value is 90% of rated voltage of the front-stage DC-DC switching power supply module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223547140.XU CN219420582U (en) | 2022-12-27 | 2022-12-27 | Time-sharing starting circuit of multipath DC-DC switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223547140.XU CN219420582U (en) | 2022-12-27 | 2022-12-27 | Time-sharing starting circuit of multipath DC-DC switching power supply |
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| CN219420582U true CN219420582U (en) | 2023-07-25 |
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| CN202223547140.XU Active CN219420582U (en) | 2022-12-27 | 2022-12-27 | Time-sharing starting circuit of multipath DC-DC switching power supply |
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