CN219535697U - Power-down protection circuit and ATE equipment - Google Patents
Power-down protection circuit and ATE equipment Download PDFInfo
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Abstract
The embodiment of the utility model provides a power-down protection circuit and ATE equipment, which relate to the technical field of electronic circuit systems, wherein the circuit is connected between a power supply unit and a protected unit and comprises: the device comprises a control unit, a detection unit and an energy storage unit, wherein the detection unit and the energy storage unit are respectively connected with the control unit; if the detection unit detects that the power supply unit works normally, the notification control unit controls the power supply unit to supply power to the protected unit; if the detection unit detects that the power supply unit is powered down, the control unit is informed to control the energy storage unit to supply power to the protected unit. The utility model solves the problem of lack of a power-down protection scheme of ATE equipment without a battery in the related technology.
Description
Technical Field
The utility model relates to the technical field of electronic circuit systems, in particular to a power-down protection circuit and ATE equipment.
Background
In ATE (Automatic Test Equipment ) devices, there are multiple embedded master control units, which control the operation of the entire ATE device and save data, so that protection of the embedded master control units is particularly important, especially if test data and operation parameters can be saved in time when the ATE device is suddenly powered off, so that a large part of economic losses can be saved.
Most of the existing power-down protection schemes of ATE equipment use a UPS (Uninterruptible Power Supply ) power supply to protect the front end of the entire ATE equipment, and switch to a battery inside the UPS to supply power to the ATE equipment after power failure. However, the power supply mode is to supply power to the whole ATE equipment, and some systems in the ATE equipment are not required to operate, so that after abnormal power failure, the power supply to the systems which are not required to operate can bring about waste of resources; meanwhile, the UPS power supply adopts a battery power supply mode after power failure, so that the UPS power supply is also a great expenditure for daily maintenance of the battery.
From the above, how to realize the battery-free power-down protection of ATE equipment remains to be solved.
Disclosure of Invention
The embodiments of the present utility model provide a power-down protection circuit, which can solve the problem of lack of a power-down protection method for ATE equipment without a battery in the related art. The technical scheme is as follows:
according to one aspect of the embodiment of the utility model, a power failure protection circuit is connected between a power supply unit and a protected unit, and comprises a control unit, a detection unit and an energy storage unit, wherein the detection unit and the energy storage unit are respectively connected with the control unit; if the detection unit detects that the power supply unit works normally, the notification control unit controls the power supply unit to supply power to the protected unit; if the detection unit detects that the power supply unit is powered down, the control unit is informed to control the energy storage unit to supply power to the protected unit.
In an exemplary embodiment, the control unit includes: the first control module and the second control module are respectively connected with the protected unit; the first control module controls the power supply unit to supply power to the protected unit when the power supply unit is not powered down; the second control module controls the energy storage unit to supply power to the protected unit when the power supply unit is powered off.
In an exemplary embodiment, the first control module and the second control module each include an ideal diode circuit.
In an exemplary embodiment, the ideal diode circuit includes a microprocessor and a MOS transistor.
In an exemplary embodiment, the energy storage unit includes: the super capacitor module is connected with the power supply unit, and the conversion module is respectively connected with the super capacitor module and the protected unit; the super capacitor module stores charges when the power supply unit is not powered down, and releases charges after the power supply unit is powered down so as to supply power to the protected unit; the conversion module boosts the voltage output by the super capacitor module to the working voltage required by the protected unit.
In an exemplary embodiment, the conversion module includes a BOOST circuit.
In an exemplary embodiment, the circuit further comprises: a charging unit connected between the power supply unit and the energy storage unit; the charging unit charges the energy storage unit when the power supply unit is not powered down, so that the energy storage unit stores charges.
In an exemplary embodiment, the charging unit includes a step-down module connected with the power supply unit, and a charging module connected with the energy storage unit.
In an exemplary embodiment, the detection unit includes a switching tube module connected between the power supply unit and the control unit; if the power supply unit is not powered down, the switching tube module is turned on, and if the power supply unit is powered down, the switching tube module is turned off.
In an exemplary embodiment, the circuit further includes a voltage stabilizing unit; the voltage stabilizing unit comprises a voltage reducing module connected between the power supply unit and the protected unit, and converts the voltage output by the power supply unit into the working voltage required by the protected unit.
According to one aspect of an embodiment of the utility model, an ATE device includes a power down protection circuit as described above.
The technical scheme provided by the utility model has the beneficial effects that:
in the technical scheme, the condition of the power supply unit can be monitored through the detection unit and fed back to the control unit in real time, and the control unit can select different power supply modes to supply power to the protected unit. If the detection unit detects that the power supply unit works normally, the notification control unit controls the power supply unit to supply power to the protected unit; if the detecting unit detects that the power supply unit is powered down, the control unit is informed to control the energy storage unit to supply power to the protected unit, the battery is not used in the whole system, normal work of the protected unit can be met only through the electric quantity provided by the super capacitor module, the overhead of daily maintenance is avoided by the super capacitor module, and the problem that a power-down protection scheme without the battery is lacking in the prior art is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments of the present utility model will be briefly described below.
Fig. 1 is a power down protection circuit shown in accordance with an exemplary embodiment.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
As previously mentioned, once an ATE device suddenly fails, it can result in loss of test data and some of the operating parameters, resulting in economic loss.
In order to avoid economic loss caused by sudden power failure of ATE equipment, a protection method is provided, specifically, an industrial UPS is connected in series between the front end of a power converter of the ATE equipment and industrial power, so that after the industrial power fails abnormally, the whole ATE equipment is powered by an energy storage battery in the UPS.
However, the above solution has drawbacks, including: 1. the UPS power supply is used for supplying power to the whole ATE equipment, some systems which do not need to operate are included, the UPS power supply is a precious power supply after abnormal power failure, and if some unnecessary systems are simultaneously operated, the time for supplying the UPS power supply can be shortened; 2. because the UPS adopts a battery power supply mode, the battery belongs to a loss product, the battery needs to be maintained regularly to ensure the normal work of the battery, even part of the UPS works in long-time standby and over-high and over-low ambient temperature, the service life of the battery is shortened, and the UPS battery needs to be replaced to ensure the normal work of the UPS; 3. because more subsystems in ATE equipment use 48V/24V voltage, and more UPS adopts 220V or 380V power supply, still need to carry out the conversion to the power and just can continue the power supply after cutting off the power supply, therefore the work efficiency of overall scheme also can be lower.
In addition, the prior art also provides a power supply scheme for distributing power by adopting an integral machine room, adopts a special machine room to supply power, integrates a generator set in the machine room, starts the generator set for a moment after power is off, and completes switching supply of power supply, thereby ensuring normal work of ATE equipment.
As can be seen, there is still a lack of a battery-free ATE equipment power-down protection scheme in the related art.
Therefore, the power-down protection circuit of the ATE equipment can effectively prevent the loss caused by sudden power down of the ATE equipment. The power-down protection circuit does not contain a battery, and avoids various influences of the battery on ATE equipment.
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.
In an exemplary embodiment, fig. 1 is a schematic diagram of a power-down protection circuit according to the present utility model. In fig. 1, the circuit is connected between the power supply unit 10 and the protected unit 20, and includes, but is not limited to: control unit 30, detection unit 40 and energy storage unit 50 that are connected respectively with control unit 30.
If the detecting unit 40 detects that the power supply unit 10 works normally, the notification control unit 30 controls the power supply unit 10 to supply power to the protected unit 20; if the detection unit 40 detects that the power supply unit 10 is powered down, the notification control unit 30 controls the energy storage unit 50 to supply power to the protected unit 20.
Specifically, the protected unit 20 may be various embedded systems, various sub-modules, various circuits, etc. in an ATE apparatus, which are not particularly limited herein.
The power supply unit 10 may be a power supply inside the ATE equipment, or a power supply outside the ATE equipment, such as industrial power or commercial power, which is not limited herein. As shown in fig. 1, the power-down protection circuit is disposed between the power supply unit 10 and the protected unit 20, and is added before each protected unit 20, so that each sub-module, each circuit, each embedded system, and the like in the protected unit 20 can still independently process data after abnormal power-down, and can protect required data very timely. Meanwhile, the voltage output by the power-down protection circuit is similar to the working voltage required by the protected unit 20, so that the electric energy in the energy storage unit 50 can be used to the maximum extent.
Optionally, the power-down protection circuit further includes a charging unit 60, an input end of the charging unit is connected between the power supply unit 10 and the detection unit 40, an output end of the charging unit 60 is connected with the energy storage unit 50, and the charging unit 60 is configured to charge the energy storage unit 50 when the power supply unit 10 is not powered down, and in particular, charge the super capacitor module in the energy storage unit 50, so that the energy storage unit 50 stores charges. In one possible implementation, the charging unit 60 includes a buck module and a charging module. Because of the unique element characteristics of the super capacitor, the super capacitor with high voltage is rare and expensive, and the super capacitor module adopted by the utility model is a super capacitor with low voltage and large capacitance. However, a voltage difference exists between the low-voltage super capacitor and the power supply unit 10, so that the input power supply is converted into a charging voltage suitable for the super capacitor through the voltage reduction module before the super capacitor is charged, and the super capacitor can be charged through the charging module. In one possible implementation, the buck module may be a DC-DC buck circuit; the charging module may be a super capacitor charging circuit.
Alternatively, when the control unit 30 supplies power to the protected unit 20 through the power supply unit 10, since the voltage output by the power supply unit 10 is generally higher than the operation voltage required by the protected unit 20, the power-down protection circuit further includes a voltage stabilizing unit 70, an input terminal of the voltage stabilizing unit 70 is connected between the power supply unit 10 and the detecting unit 40, an output terminal of the voltage stabilizing unit 70 is connected to the control unit 30, and it can also be considered that the voltage stabilizing unit is connected to the protected unit 20 through the control unit 30, and is used for converting the voltage output by the power supply unit 10 into the operation voltage required by the protected unit 20. In one possible implementation, the voltage stabilizing unit 70 includes a voltage reducing module, which may be a DC-DC voltage reducing circuit, or may be a filter circuit composed of capacitors.
It should be noted that, since the microprocessor is used in the control unit 30 provided by the present utility model, the repeated power failure condition can be shielded. Specifically, when the power supply unit 10 is powered down for 10ms and is powered up again, it may happen that the power-down protection is triggered, but the power supply unit 10 is not disconnected, so that the control unit 30 makes a misjudgment. By eliminating such jitter by the microprocessor, the effect of the shielding not being a true power failure can be effectively avoided from the abnormal signal affecting the protected unit 20.
In addition, the Powergood pin of the power supply unit 10 may directly establish connection with the control unit 30, and when the power supply unit 10 is abnormal, the control unit 30 may directly provide an alarm to the protected unit 20, so as to prompt a manager to check the abnormality of the power supply unit 10 in time.
Based on the fact that all units in the power-down protection circuit are deployed on the ATE equipment, a power-down protection scheme of the ATE equipment without a battery is provided.
With continued reference to fig. 1, in an exemplary embodiment, the control unit 30 further includes: a first control module 31, one end of the first control module 31 is connected with the voltage stabilizing unit 70, the other end is connected with the protected unit 20, and the first control module 31 is used for controlling the power supply unit 10 to supply power to the protected unit 20 when the power supply unit 10 is not powered down; and a second control module 32, one end of the second control module 32 is connected with the energy storage unit 50, the other end is connected with the protected unit 20, and the second control module 32 is used for controlling the energy storage unit 50 to supply power to the protected unit 20 when the power supply unit 10 is powered down.
Specifically, when the first control module 31 is turned on, the current cannot flow back to the energy storage unit 50 through the second control module 32; when the second control module 32 is opened, current cannot flow to the protected unit 20 through the first control module 31, i.e. only one control module is in an open state and the other is in a closed state at the same time, thereby ensuring unidirectional flow of current.
In one possible implementation, the first control module 31 and the second control module 32 each comprise an ideal diode circuit consisting of a microprocessor LM5050 and a MOS tube, so that the power supply unit 10 can be quickly switched to the energy storage unit 50 to supply power to the protected unit 20 when power failure occurs, ensuring timely supply of power.
With continued reference to fig. 1, in an exemplary embodiment, the energy storage unit 50 includes: super capacitor module 51 and conversion module 52. The super capacitor module 51 is connected between the charging unit 60 and the conversion module 52, and the conversion module 52 is connected between the super capacitor module 51 and the second control module 32.
Specifically, the super capacitor module 51 is configured to store electric charges when the power supply unit 10 is not powered down, and release the electric charges when the power supply unit 10 is powered down, so as to ensure that the protected unit 20 is powered for a certain period of time. In one possible implementation, the supercapacitor module 51 is a low-voltage, high-capacitance supercapacitor.
The conversion module 52 is configured to boost the voltage output by the supercapacitor module 51 to the working voltage required by the protected unit 20, so as to meet the requirement of the protected unit 20 on the working voltage. In one possible implementation, the conversion module may be a BOOST circuit. Because of the element characteristics of the super capacitor, the output voltage of the super capacitor is generally smaller than the required working voltage of the protected unit 20, so that the output voltage of the super capacitor needs to be boosted to the working voltage suitable for the protected unit by the BOOST circuit.
In an exemplary example, the detection unit 40 includes a switching tube module connected between the power supply unit 10 and the control unit 30; if the power supply unit 10 is not powered down, the switching tube module is turned on, and if the power supply unit 10 is powered down, the switching tube module is turned off. The switch tube module comprises, but is not limited to, a MOS tube, a triode and the like.
In one possible implementation manner, the switching tube module in the detecting unit 40 in the circuit provided by the present utility model includes a MOS tube, so as to switch the first control module 31 and the second control module 32 in the control unit 30 in a triggering manner of the MOS tube.
Specifically, when the power supply unit 10 is not powered down, the MOS tube is turned on, the detection unit 40 transmits a signal that the power supply unit 10 is not powered down to the control unit 30, and the control unit 30 maintains the continuous on state of the first control module 31, so as to supply power to the protected unit 20 through the power supply unit 10; when the power supply unit 10 is powered down, the MOS transistor is turned off, the control unit 30 performs the jitter elimination process, and after confirming the power failure, the second control module 32 is quickly turned on, the first control module 31 is turned off, and then the protected unit 20 is powered through the super capacitor module 51 in the energy storage unit 50.
Based on this, when the power supply unit 10 is abnormal, for example, when an abnormal state occurs in a certain device in the power supply unit 10, the whole power supply unit 10 cannot work normally, and at this time, the detecting unit 40 can timely detect abnormal power failure of the power supply unit 10, and can also send a power failure detection signal to the control unit 30, so as to timely notify the protected unit 20.
In an exemplary embodiment, as shown in fig. 1, the signals that the control unit 30 interacts with the charging unit 60, the detecting unit 40, and the protected unit 20, respectively, include, but are not limited to:
1. the control unit 30 sends a control signal to the charging unit 60, so as to inform the charging unit 60 whether to charge the super capacitor module 51 in the energy storage unit 50.
2. The control unit 30 receives a control signal sent by the charging unit 60, where the control signal includes at least information such as a voltage, a charging current, and the like of the super capacitor module 51.
Specifically, when the power supply unit 10 is not powered down and the super capacitor module 51 does not store charges, the control unit 30 may send a control signal to the charging unit 60, after receiving the control signal, the charging unit 60 may charge the super capacitor module 51, and feed back information such as voltage in the super capacitor module 51 and real-time charging current to the control unit 30 through the control signal, and when the information such as voltage fed back to the control unit 30 indicates that the charges stored in the super capacitor module 51 reach the maximum value, the control unit 30 sends the control signal again to control the charging unit 60 to stop charging the super capacitor module 51.
3. The control unit 30 receives a detection signal transmitted from the detection unit 40, which is used to indicate the real-time state of the power supply unit 10, i.e., whether the power supply unit 10 is powered down/powered up normally.
Specifically, when the power supply unit 10 is not powered down, the detection unit 40 sends a detection signal indicating that the power supply unit 10 is normally powered up to the control unit 30; when the power supply unit 10 is powered down, the detection unit 40 transmits a detection signal indicating that the power supply unit 10 is powered down to the control unit 30.
4. The control unit 30 transmits a control signal instructing the protected unit 20 to perform data saving to the protected unit 20.
5. The control unit 30 receives a control signal indicating that the data is stored, which is transmitted from the protected unit 20.
Specifically, when the control unit 30 receives the detection signal sent by the detection unit 40 and indicating that the power supply unit 10 is powered down, the control unit immediately sends a control signal indicating that the protected unit 20 performs data storage to the protected unit 20, thereby reminding the protected unit 20 to store data such as test data and operation parameters, and after the data storage is completed, receives the control signal returned by the protected unit 20 and indicating that the data storage is completed, and then closes the second control module 32 in the control unit 30, so as to ensure that the whole circuit is powered down, ensure that the whole circuit is normally closed, and avoid influencing the next normal start of the circuit.
6. The control unit 30 receives a control signal indicating that the power-down protection circuit is temporarily turned off, which is transmitted by the protection unit 20.
Specifically, when the whole circuit and/or the ATE equipment are in a debug state, frequent restarting and debugging are required to be performed on the protected unit 20, and at this time, the power-down protection circuit needs to be temporarily turned off, so that the overall turning-off operation of the power-down control circuit can be achieved by receiving a control signal sent by the protected unit 20 and indicating that the power-down protection circuit is temporarily turned off.
It is worth mentioning that the units can support multiple communication modes such as USB, RS232, R485, etc. at the same time, so as to satisfy the signal interaction between the units.
In an exemplary embodiment, an ATE device includes a power-down protection circuit as described above, thereby providing a power-down protection scheme for ATE devices that does not require a battery.
Compared with the related art, the utility model provides a power-down protection circuit based on a super capacitor. On one hand, the circuit has small whole volume, can be easily installed in ATE equipment, and can be installed on various embedded systems, various sub-modules and various circuits of the ATE equipment, so that the applicability is strong; on the other hand, the design without battery is adopted, so that the extra investment for battery maintenance is avoided, the overall voltage of the circuit is close to the working voltage required by the protected unit, the working efficiency is high, and the problem that a battery-free power-down protection scheme is lacked in the prior art is effectively solved. Moreover, based on different states of the power supply unit, the power supply mode is timely switched through the control unit, so that stable working voltage can be provided for the protected unit when the power supply unit suddenly fails, and economic loss caused by data loss due to power failure is reduced.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (9)
1. The power failure protection circuit is characterized by being connected between a power supply unit and a protected unit, and comprises a control unit, a detection unit, an energy storage unit and a charging unit, wherein the detection unit and the energy storage unit are respectively connected with the control unit; wherein,,
if the detection unit detects that the power supply unit works normally, the control unit is informed to control the power supply unit to supply power to the protected unit, and the energy storage unit is charged through the charging unit, so that the energy storage unit stores charges; if the detection unit detects that the power supply unit is powered down, the control unit is informed to control the energy storage unit to supply power to the protected unit.
2. The circuit of claim 1, wherein the control unit comprises: the first control module and the second control module are respectively connected with the protected unit; wherein,,
the first control module controls the power supply unit to supply power to the protected unit when the power supply unit is not powered down;
the second control module controls the energy storage unit to supply power to the protected unit when the power supply unit is powered off.
3. The circuit of claim 2, wherein the first control module and the second control module each comprise an ideal diode circuit.
4. The circuit of claim 1, wherein the energy storage unit comprises: the super capacitor module is connected with the power supply unit, and the conversion module is respectively connected with the super capacitor module and the protected unit; wherein,,
the super capacitor module stores charges when the power supply unit is not powered down, and releases charges after the power supply unit is powered down so as to supply power to the protected unit;
the conversion module boosts the voltage output by the super capacitor module to the working voltage required by the protected unit.
5. The circuit of claim 4, wherein the conversion module comprises a BOOST circuit.
6. The circuit of claim 1, wherein the charging unit comprises a buck module connected to the power supply unit, and a charging module connected to the energy storage unit.
7. The circuit of claim 1, wherein the detection unit comprises a switching tube module connected between the power supply unit and the control unit; wherein,,
if the power supply unit is not powered down, the switching tube module is turned on, and if the power supply unit is powered down, the switching tube module is turned off.
8. The circuit of any one of claims 1 to 7, wherein the circuit further comprises a voltage stabilizing unit; wherein,,
the voltage stabilizing unit comprises a voltage reducing module connected between the power supply unit and the protected unit, and converts the voltage output by the power supply unit into the working voltage required by the protected unit.
9. An ATE device comprising the power down protection circuit of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223609980.4U CN219535697U (en) | 2022-12-30 | 2022-12-30 | Power-down protection circuit and ATE equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223609980.4U CN219535697U (en) | 2022-12-30 | 2022-12-30 | Power-down protection circuit and ATE equipment |
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| CN219535697U true CN219535697U (en) | 2023-08-15 |
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| CN202223609980.4U Active CN219535697U (en) | 2022-12-30 | 2022-12-30 | Power-down protection circuit and ATE equipment |
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