CN220457289U - Power supply soft start circuit and equipment thereof - Google Patents
Power supply soft start circuit and equipment thereof Download PDFInfo
- Publication number
- CN220457289U CN220457289U CN202321934323.9U CN202321934323U CN220457289U CN 220457289 U CN220457289 U CN 220457289U CN 202321934323 U CN202321934323 U CN 202321934323U CN 220457289 U CN220457289 U CN 220457289U
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- 238000004146 energy storage Methods 0.000 claims abstract description 64
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 103
- 238000001914 filtration Methods 0.000 claims description 9
- 101000795655 Canis lupus familiaris Thymic stromal cotransporter homolog Proteins 0.000 claims description 6
- 239000010409 thin film Substances 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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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 embodiment of the utility model discloses a power soft start circuit and equipment thereof, wherein the circuit comprises: the power system comprises a main power module and a buffer energy storage module, wherein the buffer energy storage module is connected between the positive electrode and the negative electrode of a power supply, and the main power module is connected with the buffer energy storage module in parallel; the buffer energy storage module is used for inhibiting surge current generated when the power supply is electrified. According to the embodiment of the utility model, the control unit and the energy storage unit are connected in parallel at two ends of the power supply after being connected in series, and the surge current is restrained through the impedance of the control unit, so that the peak voltage generated by the power supply circuit when soft start is met is effectively avoided, the rear-end device is protected, the system loss is reduced while the hot plug function is realized, and the overall efficiency of the system is improved. The impact of surge current on the power supply is avoided, and the service life of the power supply is prolonged.
Description
Technical Field
The embodiment of the utility model relates to the field of switching power supplies, in particular to a power supply soft start circuit and equipment thereof.
Background
In a switching power supply circuit, particularly in the process of battery installation, under the condition that a port is provided with a filter electrolytic capacitor, hot plug with a terminal exists, and a rear-stage module can be damaged due to the fact that large impact current is generated after hot plug. The traditional soft start circuit causes larger line loss of the main loop and lower system efficiency on the main loop.
In the traditional soft start circuit, the bypass switch in the buffer circuit is required to bear the large current of the main power circuit and the charging current on the capacitor when the system is in full-load operation, so that larger loss can be generated on the bypass switch to cause lower system efficiency, and meanwhile, the bypass switch is required to bear larger current to cause high cost and large volume of the bypass switch.
Disclosure of Invention
In order to solve the technical problems, the utility model adopts a technical scheme that: there is provided a power soft start circuit comprising: the power system comprises a main power module and a buffer energy storage module, wherein the buffer energy storage module is connected between the positive electrode and the negative electrode of a power supply, and the main power module is connected with the buffer energy storage module in parallel; the buffer energy storage module is used for inhibiting surge current generated by the power supply when the power supply is powered on.
In some embodiments, the buffer energy storage module comprises an energy storage unit and a control unit, wherein the energy storage unit and the control unit are connected in series and then connected with the power supply in parallel; the energy storage unit is used for carrying out energy storage, filtering and suppressing output voltage ripple of the power supply in cooperation with the main power module; the control unit is used for restraining surge current generated by charging the energy storage unit when the power supply is powered on.
In some embodiments, the buffer energy storage module further comprises a filter unit connected in parallel with the power supply.
In some embodiments, the energy storage unit includes a capacitor CE6, a capacitor CE7, and a capacitor CE8, where a first end of the capacitor CE6 is connected to a positive electrode of the power supply, and a second end of the capacitor CE6 is connected to an input end of the control unit; the capacitor CE7 is connected in parallel with the capacitor CE 6; the first end of the capacitor CE8 is connected with the positive electrode of the power supply, and the second end of the capacitor CE8 is connected with the input end of the control unit.
In some embodiments, the control unit includes a MOS transistor Q7, a MOS transistor Q12, and a resistor R72, where a gate of the MOS transistor Q7 is configured to receive the first driving signal, and a drain of the MOS transistor Q7 is connected to the energy storage unit; the grid electrode of the MOS tube Q12 is used for receiving a second driving signal, the drain electrode of the MOS tube Q12 is connected with the second end of the resistor R72, and the first end of the resistor R72 is connected with the energy storage unit; the source electrode of the MOS transistor Q7 and the source electrode of the MOS transistor Q12 are connected with the negative electrode of the power supply.
In some embodiments, the control unit further includes a resistor R71, a resistor R80, a resistor R82, a resistor R84, a capacitor C18, and a capacitor C19, where a second end of the resistor R71 is connected to the gate of the MOS transistor Q7, a first end of the resistor R71 is connected to the first end of the capacitor C18, a second end of the capacitor C18 is connected to the source of the MOS transistor Q7, and the first driving signal is input to the gate of the MOS transistor Q7 through the resistor R71; the resistor R80 is connected to two ends of the grid electrode and the source electrode of the MOS tube Q7; the second end of the resistor R82 is connected with the grid electrode of the MOS tube Q12, the first end of the resistor R82 is connected with the first end of the capacitor C18, the second end of the capacitor C19 is connected to the source electrode of the MOS tube Q12, and a second driving signal is input to the grid electrode of the MOS tube Q12 through the resistor R82; resistor R84 is connected at both ends of the grid and the source of MOS transistor Q12.
In some embodiments, when the power supply is powered on, the MOS transistor Q12 is turned on in response to the second driving signal, so that the power supply charges the energy storage unit through the resistor R72; when the charging of the energy storage unit is completed, the MOS transistor Q12 is disconnected, and the MOS transistor Q7 is conducted in response to a first driving signal; when the power supply is turned off, the switching tube Q7 is turned off.
In some embodiments, the filtering unit is a capacitor CE11, and the capacitor CE11 is connected in parallel to the power supply.
In some embodiments, the types of capacitance CE6, capacitance CE7, and capacitance CE8 include electrolytic capacitance and thin film capacitance.
In order to solve the technical problems, the utility model adopts another technical scheme that: there is provided a power soft start apparatus comprising: such as the voltage soft start circuit described above.
The embodiment of the utility model has the beneficial effects that: compared with the prior art, the embodiment of the utility model has the advantages that the control unit and the energy storage unit are connected in series and then connected in parallel at the two ends of the power supply, the surge current is restrained through the impedance of the control unit, the peak voltage generated by the power supply circuit when the soft start is met is effectively avoided, the rear-end device is protected, the system loss is reduced while the hot plug function is realized, and the overall efficiency of the system is improved. The impact of surge current on the power supply is avoided, and the service life of the power supply is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a power soft start circuit according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a buffer energy storage module according to an embodiment of the present utility model;
fig. 3 is a circuit structure diagram of a power soft start circuit according to an embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In this embodiment, a power soft start circuit is provided, and a schematic structural diagram of the power soft start circuit is shown in fig. 1, where the power soft start circuit includes a main power module 120 and a buffer energy storage module 110, the buffer energy storage module 110 is connected between an anode and a cathode of a power supply 20, and the main power module 110 is connected in parallel with the buffer energy storage module 120.
The main power module 120 generally needs to be matched with a larger energy storage filter capacitor to achieve smaller ripple voltage performance. In the power-on process or the hot plug process of the power soft start circuit, the main power module 120 does not work, and presents a larger impedance at the moment, so that the surge current generated by the main power module 120 is very small.
The buffer energy storage module 110 is used for suppressing surge current generated by the power supply 20 when power is supplied. The buffer energy storage module 110 is provided with an energy storage filter capacitor to cooperate with the main power module 120 to achieve smaller ripple voltage performance, but in the power-on process or the hot plug process of the power soft start circuit, the charging current of the energy storage filter capacitor can generate larger surge current. A current limiting resistor is also provided in the buffer energy storage module 110 to limit the inrush current to an acceptable range.
After the soft start is completed, the power supply 20 supplies power to the subsequent load through the main power module 120.
In this embodiment, the main power module 120 includes a conventional topology such as a full-bridge circuit, a half-bridge circuit, and a resonant circuit.
The embodiment of the application provides a buffer energy storage module 110, the structure of which is shown in fig. 2, and the buffer energy storage module 110 includes an energy storage unit 111, a control unit 112 and a filtering unit 113.
The energy storage unit 111 and the control unit 112 are connected in series and then connected in parallel with the power supply 20, and the filtering unit 113 is connected in parallel with the power supply 20.
The energy storage unit 111 is used for storing energy, filtering and suppressing output voltage ripple of the power supply 20 in cooperation with the main power module; the control unit 112 is configured to suppress a surge current generated when the power supply is powered on to charge the energy storage unit 111; the filtering unit 113 is used for filtering.
Referring to fig. 3, fig. 3 is a circuit diagram of a power soft start circuit according to an embodiment of the present application, which shows a circuit structure of a main power module 120 and a buffer energy storage module 110 (i.e., an energy storage unit 111, a control unit 112, and a filtering unit 113).
The energy storage unit 111 includes a capacitor CE6, a capacitor CE7, and a capacitor CE8, where a first end of the capacitor CE6 is connected to a positive pole vbat+ of the power supply, and a second end of the capacitor CE6 is connected to an input end of the control unit 112 (i.e., a drain electrode of the MOS transistor Q7 shown in fig. 3); the capacitor CE7 is connected in parallel with the capacitor CE 6; the first end of the capacitor CE8 is connected to the positive pole vbat+ of the power supply, and the second end of the capacitor CE8 is connected to the input end of the control unit 112 (i.e. the drain electrode of the MOS transistor Q7 shown in fig. 3).
In this embodiment, the capacitance types of the capacitor CE6, the capacitor CE7 and the capacitor CE8 are electrolytic capacitors, that is, the positive electrode of the capacitor CE6 is connected to the positive electrode vbat+ of the power supply, and the negative electrode of the capacitor CE6 is connected to the input end of the control unit 112 (that is, the drain electrode of the MOS transistor Q7 shown in fig. 3); the positive electrode of the capacitor CE7 is connected with the positive electrode of the capacitor CE6, and the negative electrode of the capacitor CE7 is connected with the negative electrode of the capacitor CE 6; the positive electrode of the capacitor CE8 is connected to the positive electrode vbat+ of the power supply, and the negative electrode of the capacitor CE8 is connected to the input end of the control unit 112 (i.e., the drain electrode of the MOS transistor Q7 shown in fig. 3).
In other embodiments, the capacitance types of the capacitor CE6, the capacitor CE7, and the capacitor CE8 may be thin film capacitors.
The control unit 112 includes a MOS transistor Q7, a MOS transistor Q12, a resistor R72, a resistor R71, a resistor R80, a resistor R82, a resistor R84, a capacitor C18, and a capacitor C19, where a gate of the MOS transistor Q7 is configured to receive a first driving signal dsg_mcu, and a drain of the MOS transistor Q7 is connected to the energy storage unit 111 (i.e., a negative electrode of the capacitor CE6 shown in fig. 3); the gate of the MOS transistor Q12 is configured to receive the second driving signal pre_ch_mcu, the drain of the MOS transistor Q12 is connected to the second end of the resistor R72, and the first end of the resistor R72 is connected to the energy storage unit 111 (i.e., the negative electrode of the capacitor CE6 shown in fig. 3); the source electrode of the MOS tube Q7 and the source electrode of the MOS tube Q12 are connected with the cathode VBAT-of the power supply.
The second end of the resistor R71 is connected with the grid electrode of the MOS tube Q7, the first end of the resistor R71 is connected with the first end of the capacitor C18, the second end of the capacitor C18 is connected to the source electrode of the MOS tube Q7, and the first driving signal DSG_MCU is input to the grid electrode of the MOS tube Q7 through the resistor R71; resistor R80 is connected at both ends of the grid and the source of MOS tube Q7.
The second end of the resistor R82 is connected with the grid electrode of the MOS tube Q12, the first end of the resistor R82 is connected with the first end of the capacitor C18, the second end of the capacitor C19 is connected to the source electrode of the MOS tube Q12, and the second driving signal PRE_CH_MCU is input to the grid electrode of the MOS tube Q12 through the resistor R82; resistor R84 is connected at both ends of the grid and the source of MOS transistor Q12.
Specifically, when the power supply is not powered on, the MOS transistor Q12 and the MOS transistor Q7 are both in the off state, and the energy storage unit 111 (i.e., the capacitor CE6, the capacitor CE7, and the capacitor CE8 shown in fig. 3) is not in a suspended state with the power supply. When the power supply is powered on, a second driving signal PRE_CH_MCU is input to a resistor R82, and the MOS transistor Q12 is turned on in response to the second driving signal PRE_CH_MCU, so that the power supply charges the energy storage unit 111 (namely a capacitor CE6, a capacitor CE7 and a capacitor CE8 shown in FIG. 3) through the resistor R72; in this process, the surge current generated by the energy storage unit 111 during the charging process due to the charging current is limited to an acceptable range due to the current limitation of the resistor R72.
After the energy storage unit 111 (i.e. the capacitor CE6, the capacitor CE7 and the capacitor CE8 shown in fig. 3) is charged, the MOS transistor Q12 is turned off, and simultaneously a first driving signal dsg_mcu is input to the resistor R71, and the MOS transistor Q7 is turned on in response to the first driving signal dsg_mcu; the soft start circuit of the power supply finishes the soft start process.
When the power supply is turned off, the switching tube Q7 is turned off, and the energy storage unit 111 (i.e., the capacitor CE6, the capacitor CE7, and the capacitor CE8 shown in fig. 3) is in a floating state again.
In this process, the MOS transistor Q7 and the MOS transistor Q12 are connected in series to the cathodes of the capacitor CE6, the capacitor CE7, and the capacitor CE8 in the power soft start circuit, and only the maximum currents of the capacitor CE6, the capacitor CE7, and the capacitor CE8 flow, so that the system line loss only calculates the current loss of the capacitor CE6, the capacitor CE7, and the capacitor CE 8. When the system formed by the power soft start circuit works normally, the MOS tube Q7 only bears ripple currents of the capacitor CE6, the capacitor CE7 and the capacitor CE8, and the current is about 10% of the current of the main power module 120, so that the loss of the MOS tube Q7 is very small, and the cost and the volume can be greatly reduced.
In the embodiment of the application, the MOS transistor Q7 and the MOS transistor Q12 are both N-channel field effect transistors, and other types of switching transistors, such as transistors or IGBT transistors, may be used instead.
The filter unit is a capacitor CE11, and the capacitor CE11 is connected between the positive pole VBAT+ and the negative pole VBAT-of the power supply.
In this embodiment of the present application, the main power module 120 adopts a half-bridge topology, and the main power module 120 includes a MOS transistor M1 and a MOS transistor M2, where a drain electrode of the MOS transistor M1 is connected to an anode vbat+ of a power supply, a source electrode of the MOS transistor M1 is connected to a drain electrode of the MOS transistor M2, and a source electrode of the MOS transistor M2 is connected to a cathode VBAT-of the power supply.
In some embodiments of the present application, there is also provided a power soft start device comprising a power soft start circuit as described above.
Compared with the prior art, the embodiment of the utility model has the advantages that the control unit and the energy storage unit are connected in series and then connected in parallel at the two ends of the power supply, the surge current is restrained through the impedance of the control unit, the peak voltage generated by the power supply circuit when the soft start is met is effectively avoided, the rear-end device is protected, the system loss is reduced while the hot plug function is realized, and the overall efficiency of the system is improved. The impact of surge current on the power supply is avoided, and the service life of the power supply is prolonged.
It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.
Claims (10)
1. A power soft start circuit, comprising: a main power module and a buffer energy storage module, wherein,
the buffer energy storage module is connected between the positive electrode and the negative electrode of the power supply, and the main power module is connected with the buffer energy storage module in parallel;
the buffer energy storage module is used for inhibiting surge current generated when the power supply is electrified.
2. The circuit of claim 1, wherein the buffer energy storage module comprises an energy storage unit and a control unit, wherein the energy storage unit and the control unit are connected in series and then connected in parallel with the power supply;
the energy storage unit is used for storing energy, filtering and suppressing output voltage ripples of the power supply in cooperation with the main power module;
the control unit is used for inhibiting surge current generated by charging the energy storage unit when the power supply is electrified.
3. The circuit of claim 2, wherein the buffer energy storage module further comprises a filter unit, the filter unit being connected in parallel with the power supply.
4. The circuit of claim 2, wherein the energy storage unit comprises a capacitor CE6, a capacitor CE7, and a capacitor CE8, wherein,
the first end of the capacitor CE6 is connected with the positive electrode of the power supply, and the second end of the capacitor CE6 is connected with the input end of the control unit;
the capacitor CE7 is connected in parallel with the capacitor CE 6;
the first end of the capacitor CE8 is connected with the positive electrode of the power supply, and the second end of the capacitor CE8 is connected with the input end of the control unit.
5. The circuit of claim 2, wherein the control unit comprises a MOS transistor Q7, a MOS transistor Q12, and a resistor R72, wherein,
the grid electrode of the MOS tube Q7 is used for receiving a first driving signal, and the drain electrode of the MOS tube Q7 is connected with the energy storage unit;
the grid electrode of the MOS tube Q12 is used for receiving a second driving signal, the drain electrode of the MOS tube Q12 is connected with the second end of the resistor R72, and the first end of the resistor R72 is connected with the energy storage unit;
the source electrode of the MOS tube Q7 and the source electrode of the MOS tube Q12 are connected with the negative electrode of the power supply.
6. The circuit of claim 5, wherein the control unit further comprises a resistor R71, a resistor R80, a resistor R82, a resistor R84, a capacitor C18, and a capacitor C19, wherein,
the second end of the resistor R71 is connected with the grid electrode of the MOS tube Q7, the first end of the resistor R71 is connected with the first end of the capacitor C18, the second end of the capacitor C18 is connected to the source electrode of the MOS tube Q7, and the first driving signal is input to the grid electrode of the MOS tube Q7 through the resistor R71;
the resistor R80 is connected to two ends of the grid electrode and the source electrode of the MOS tube Q7;
the second end of the resistor R82 is connected with the grid electrode of the MOS tube Q12, the first end of the resistor R82 is connected with the first end of the capacitor C18, the second end of the capacitor C19 is connected to the source electrode of the MOS tube Q12, and the second driving signal is input to the grid electrode of the MOS tube Q12 through the resistor R82;
the resistor R84 is connected to two ends of the grid electrode and the source electrode of the MOS tube Q12.
7. The circuit of claim 5, wherein when the power supply is powered on, the MOS transistor Q12 is turned on in response to the second driving signal, so that the power supply charges the energy storage unit through the resistor R72;
when the energy storage unit is charged, the MOS transistor Q12 is disconnected, and the MOS transistor Q7 is conducted in response to the first driving signal;
when the power supply is powered off, the MOS transistor Q7 is disconnected.
8. A circuit according to claim 3, wherein the filter unit is a capacitor CE11, the capacitor CE11 being connected in parallel with the power supply.
9. The circuit of claim 4, wherein the types of the capacitor CE6, the capacitor CE7, and the capacitor CE8 include electrolytic capacitors and thin film capacitors.
10. A power soft start device, comprising:
a power supply soft start circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321934323.9U CN220457289U (en) | 2023-07-20 | 2023-07-20 | Power supply soft start circuit and equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321934323.9U CN220457289U (en) | 2023-07-20 | 2023-07-20 | Power supply soft start circuit and equipment thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220457289U true CN220457289U (en) | 2024-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321934323.9U Active CN220457289U (en) | 2023-07-20 | 2023-07-20 | Power supply soft start circuit and equipment thereof |
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| Country | Link |
|---|---|
| CN (1) | CN220457289U (en) |
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2023
- 2023-07-20 CN CN202321934323.9U patent/CN220457289U/en active Active
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