CN212413047U - Power supply device for suppressing instantaneous voltage - Google Patents
Power supply device for suppressing instantaneous voltage Download PDFInfo
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- CN212413047U CN212413047U CN202022190445.4U CN202022190445U CN212413047U CN 212413047 U CN212413047 U CN 212413047U CN 202022190445 U CN202022190445 U CN 202022190445U CN 212413047 U CN212413047 U CN 212413047U
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Abstract
The utility model discloses a restrain instantaneous voltage's power supply device is applied to an input voltage, and this restrain instantaneous voltage's power supply device contains a power supply circuit, a reply signal production circuit and a reply signal control circuit. If the power supply circuit stops receiving the input voltage, the feedback signal control circuit controls the feedback signal generation circuit to discharge so that the feedback signal generation circuit controls the power supply circuit to reduce an output voltage, so that when the power supply circuit receives the input voltage again, the power supply circuit avoids generating an output overvoltage condition on the output voltage.
Description
Technical Field
The present invention relates to a power supply device, and more particularly, to a power supply device for suppressing an instantaneous voltage.
Background
A related art power supply circuit receives an input voltage to convert the input voltage into an output voltage; the related art power supply circuit can utilize a related art feedback signal generating circuit to feedback control the output voltage; generally, the related art feedback signal generating circuit may include a related art operational amplifier and a related art reference voltage source, the related art operational amplifier being electrically connected to the related art reference voltage source, the related art operational amplifier comparing a voltage division of the output voltage with a reference voltage of the related art reference voltage source to feedback control the output voltage; therefore, the related art power supply circuit can generate the stable output voltage.
If the related art power supply circuit stops receiving the input voltage, the related art feedback signal generating circuit detects a decrease in the output voltage, and thus the related art feedback signal generating circuit controls the related art power supply circuit to request the related art power supply circuit to increase the output voltage; if the related art operational amplifier is still operated during the period when the related art power supply circuit stops receiving the input voltage to request the related art power supply circuit to increase the output voltage, the output voltage may generate an output overvoltage condition when the related art power supply circuit receives the input voltage again, especially when the related art power supply circuit is in a light load state or a no load state.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a power supply device for suppressing an instantaneous voltage.
To achieve the above object, the present invention provides a power supply device for suppressing transient voltage, which is applied to an input voltage, the power supply device for suppressing transient voltage comprises: a power supply circuit; a feedback signal generating circuit electrically connected to the power supply circuit; and a feedback signal control circuit electrically connected to the power supply circuit and the feedback signal generating circuit, wherein the power supply circuit is configured such that when the power supply circuit stops receiving the input voltage, the feedback signal control circuit controls the feedback signal generating circuit to discharge so that the feedback signal generating circuit controls the power supply circuit to reduce an output voltage, so that the power supply circuit receives the input voltage again, and the power supply circuit avoids generating an output overvoltage condition for the output voltage.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the power supply circuit includes: an auxiliary voltage generating sub-circuit electrically connected to the feedback signal control circuit.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the feedback signal control circuit includes: a voltage detection sub-circuit electrically connected to the auxiliary voltage generation sub-circuit.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the feedback signal control circuit further includes: a voltage adjusting sub-circuit electrically connected to the power supply circuit, the feedback signal generating circuit and the voltage detecting sub-circuit, wherein the power supply circuit is configured such that when the power supply circuit stops receiving the input voltage, the voltage detecting sub-circuit detects that the auxiliary voltage generating sub-circuit stops generating an auxiliary voltage and the voltage detecting sub-circuit notifies the voltage adjusting sub-circuit that the auxiliary voltage generating sub-circuit stops generating the auxiliary voltage, so that the voltage adjusting sub-circuit controls the feedback signal generating circuit to discharge.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the feedback signal generating circuit includes: and the voltage adjusting sub-circuit is configured to output a low voltage to the reference voltage source under the condition that the voltage adjusting sub-circuit controls the feedback signal generating circuit to discharge, so that the reference voltage source stops working.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the voltage detection sub-circuit includes: a first Zener diode electrically connected to the auxiliary voltage generating sub-circuit and the voltage adjusting sub-circuit; and a first resistor electrically connected to the first Zener diode and the voltage regulator sub-circuit.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the voltage adjustment sub-circuit includes: a first diode electrically connected to the first Zener diode and the first resistor; a second diode electrically connected to the first diode and the reference voltage source; and a second resistor electrically connected to the feedback signal generating circuit, the first diode and the second diode.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the feedback signal generating circuit further includes: an operational amplifier electrically connected to the reference voltage source and the second resistor; and a feedback sub-circuit electrically connected to the operational amplifier and the power supply circuit, wherein the operational amplifier comprises an operational amplifier output terminal, an operational amplifier inverting input terminal and an operational amplifier non-inverting input terminal; the output end of the operational amplifier is electrically connected to the feedback sub-circuit; the non-inverting input terminal of the operational amplifier is electrically connected to the reference voltage source.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the feedback signal generating circuit further includes: a first voltage dividing resistor electrically connected to the power supply circuit, the second resistor, the inverting input terminal of the operational amplifier and the feedback sub-circuit; and a second voltage-dividing resistor electrically connected to the first voltage-dividing resistor and the inverting input terminal of the operational amplifier, wherein the reference voltage source is configured such that a first voltage at the non-inverting input terminal of the operational amplifier is less than a first voltage division between the first voltage-dividing resistor and the second voltage-dividing resistor when the reference voltage source is disabled, so that the operational amplifier controls the power supply circuit to reduce the output voltage through the output terminal of the operational amplifier and the feedback sub-circuit.
Furthermore, in an embodiment of the power supply apparatus for suppressing an instantaneous voltage according to the present invention, the power supply circuit further includes: a pulse width modulation control sub-circuit electrically connected to the feedback sub-circuit; a power switch electrically connected to the PWM control sub-circuit; a transformer electrically connected to the power switch and the auxiliary voltage generating sub-circuit; a rectifying and filtering loop electrically connected to the transformer, the feedback sub-circuit, the first voltage dividing resistor and the second resistor; and an output end capacitor, the output end capacitor is electrically connected to the first voltage dividing resistor, the second resistor, the rectifying and filtering loop and the feedback sub-circuit.
The utility model has the advantages that if the feedback signal generating circuit still works during the period that the power supply circuit stops receiving the input voltage, when the power supply circuit receives the input voltage again, the power supply circuit can avoid generating the output overvoltage condition. Furthermore, in an embodiment of the present invention, if the operational amplifier is still operating during the period when the power supply circuit stops receiving the input voltage, the power supply circuit can avoid generating the output overvoltage condition when the power supply circuit receives the input voltage again, especially when the power supply circuit is in a light load state or a no load state; wherein if the operational amplifier is still working during the period that the power supply circuit stops receiving the input voltage, the operational amplifier is forced to control the pulse width modulation control sub-circuit through the output end of the operational amplifier and the feedback sub-circuit so as to reduce the output voltage.
In order to further understand the technology, means and functions of the present invention adopted to achieve the predetermined objects, please refer to the following detailed description and accompanying drawings related to the present invention, which are believed to provide further and specific understanding of the objects, features and characteristics of the present invention, however, the attached drawings are provided for reference and illustration purposes only, and are not intended to limit the present invention.
Drawings
Fig. 1 is a block diagram of a power supply device for suppressing an instantaneous voltage according to a first embodiment of the present invention;
fig. 2 is a circuit block diagram of a power supply device for suppressing an instantaneous voltage according to a second embodiment of the present invention.
Symbolic illustration in the drawings:
10 power supply device for suppressing instantaneous voltage;
20, a power supply circuit;
30, a feedback signal generating circuit;
40, a feedback signal control circuit;
50, inputting voltage;
60, outputting voltage;
202, a pulse width modulation control sub-circuit;
204, a power switch;
206, a transformer;
208, a rectification filter loop;
an auxiliary voltage generating sub-circuit 210;
212, output end capacitance;
214 auxiliary voltage;
306 an operational amplifier;
308, an operational amplifier output end;
310, an inverting input end of the operational amplifier;
312, non-inverting input of operational amplifier;
314, a first divider resistor;
316, a second voltage-dividing resistor;
318, a feedback sub-circuit;
320: a first voltage;
322, first partial pressure;
328, reference voltage;
402, a voltage detection sub-circuit;
404, a voltage regulation sub-circuit;
406, low voltage;
410 a first zener diode;
412 a first resistor;
414 first diode;
a second diode 416;
420, a second resistor;
424 high voltage.
Detailed Description
In the disclosure, numerous specific details are provided to provide a thorough understanding of embodiments of the invention; one skilled in the art will recognize, however, that the invention may be practiced without one or more of the specific details; in other instances, well-known details are not shown or described to avoid obscuring aspects of the invention. The technical content and the detailed description of the present invention are described below with reference to the drawings:
please refer to fig. 1, which is a block diagram of a power supply apparatus for suppressing an instantaneous voltage according to a first embodiment of the present invention. The utility model relates to a power supply device 10 for suppressing instantaneous voltage, which is applied to an input voltage 50; the power supply device 10 for suppressing the transient voltage comprises a power supply circuit 20, a feedback signal generating circuit 30 and a feedback signal control circuit 40; the components are electrically connected with each other. If the power supply circuit 20 stops receiving the input voltage 50, the feedback signal control circuit 40 controls the feedback signal generating circuit 30 to discharge so that the feedback signal generating circuit 30 controls the power supply circuit 20 to decrease an output voltage 60, so that when the power supply circuit 20 receives the input voltage 50 again, the power supply circuit 20 avoids generating an output overvoltage condition for the output voltage 60.
Furthermore, the input voltage 50 can be a direct current voltage or an alternating current voltage. The power supply circuit 20 is used for converting the input voltage 50 into the output voltage 60; the power supply circuit 20 may be a power supply, but the present invention is not limited thereto. The feedback signal generating circuit 30 is used for detecting the output voltage 60 to control the power supply circuit 20 to feedback control the output voltage 60; the feedback signal generating circuit 30 may be a feedback signal generator, but the present invention is not limited thereto. The feedback signal control circuit 40 may be a feedback signal controller, but the present invention is not limited thereto. The power supply circuit 20 stops receiving the input voltage 50 and can cut off the input voltage 50, but the present invention is not limited thereto.
Furthermore, the feedback signal control circuit 40 is used for detecting an auxiliary voltage 214 provided by the power supply circuit 20; if the auxiliary voltage 214 is present (i.e., the power supply circuit 20 receives the input voltage 50; the input voltage 50 is not powered off; the feedback signal control circuit 40 receives the auxiliary voltage 214), the feedback signal control circuit 40 generates and transmits a high voltage 424 to the feedback signal generation circuit 30 to enable the feedback signal generation circuit 30 to operate normally (i.e., the feedback signal generation circuit 30 detects the output voltage 60 to control the power supply circuit 20 to feedback-control the output voltage 60); if the auxiliary voltage 214 is not present (i.e., the power supply circuit 20 stops receiving the input voltage 50; the input voltage 50 is powered off; the feedback signal control circuit 40 stops receiving the auxiliary voltage 214), the feedback signal control circuit 40 generates and transmits a low voltage 406 to the feedback signal generation circuit 30 so that the feedback signal generation circuit 30 can discharge to avoid requiring the power supply circuit 20 to increase the output voltage 60.
Please refer to fig. 2, which is a block diagram of a power supply apparatus for suppressing an instantaneous voltage according to a second embodiment of the present invention; the components shown in fig. 2 are the same as those shown in fig. 1, and for the sake of brevity, their description will not be repeated here. The power supply circuit 20 includes a pwm control sub-circuit 202, a power switch 204, a transformer 206, a rectifying-filtering circuit 208, an auxiliary voltage generating sub-circuit 210, and an output capacitor 212; the feedback signal generating circuit 30 includes a reference voltage source 302, the operational amplifier 306, a first voltage dividing resistor 314, a second voltage dividing resistor 316 and a feedback sub-circuit 318; the feedback signal control circuit 40 includes a voltage detection sub-circuit 402 and a voltage adjustment sub-circuit 404; the operational amplifier 306 comprises an operational amplifier output 308, an operational amplifier inverting input 310, and an operational amplifier non-inverting input 312; the voltage detection sub-circuit 402 includes a first zener diode 410 and a first resistor 412; the voltage adjustment sub-circuit 404 includes a first diode 414, a second diode 416, and a second resistor 420; the components are electrically connected with each other.
If the power supply circuit 20 stops receiving the input voltage 50, the voltage detection sub-circuit 402 detects that the auxiliary voltage generation sub-circuit 210 stops generating the auxiliary voltage 214 and the voltage detection sub-circuit 402 informs the voltage adjustment sub-circuit 404 that the auxiliary voltage generation sub-circuit 210 stops generating the auxiliary voltage 214, such that the voltage adjustment sub-circuit 404 outputs the low voltage 406 to the reference voltage source 302, such that the reference voltage source 302 stops working and a first voltage 320 at the non-inverting input 312 of the operational amplifier is smaller than a first voltage 322 between the first voltage-dividing resistor 314 and the second voltage-dividing resistor 316, such that the operational amplifier 306 controls the power supply circuit 20 through the output 308 of the operational amplifier and the feedback sub-circuit 318 to reduce the output voltage 60.
Wherein, if the power supply circuit 20 stops receiving the input voltage 50, then:
an anode voltage of the first diode 414 [ the output voltage 60 × a first resistance value of the first resistor 412/(the first resistance value of the first resistor 412 + a second resistance value of the second resistor 420) ] + a first barrier voltage of the first diode 414
The low voltage 406 ═ the anode voltage of the first diode 414 — a second barrier voltage of the second diode 416 ═ the output voltage 60 × the first resistance value of the first resistor 412/(the first resistance value of the first resistor 412 + the second resistance value of the second resistor 420) ] + the first barrier voltage of the first diode 414 — the second barrier voltage of the second diode 416
If the first barrier voltage of the first diode 414 is equal to the second barrier voltage of the second diode 416 (e.g., 0.7 volts), then:
the low voltage 406 equals to the output voltage 60 × the first resistance of the first resistor 412/(the first resistance of the first resistor 412 + the second resistance of the second resistor 420)
The reference voltage source 302 may be a zener diode, a buck integrated circuit, a constant current source circuit, or a voltage dividing circuit similar to the voltage dividing circuit including the first voltage dividing resistor 314 and the second voltage dividing resistor 316, but the present invention is not limited thereto; the first resistor 412 and the second resistor 420 may be appropriately designed (e.g., the first resistance of the first resistor 412 is small) so that the low voltage 406 is small enough that the reference voltage source 302 stops providing a reference voltage 328 to the op-amp non-inverting input 312 (i.e., the reference voltage source 302 stops operating). If the power supply circuit 20 stops receiving the input voltage 50, the output voltage 60 is provided by the output capacitor 212 and gradually decreases.
Furthermore, if the power supply circuit 20 receives the input voltage 50, the voltage detection sub-circuit 402 detects that the auxiliary voltage generation sub-circuit 210 generates the auxiliary voltage 214 and the voltage detection sub-circuit 402 informs the voltage adjustment sub-circuit 404 that the auxiliary voltage generation sub-circuit 210 generates the auxiliary voltage 214, such that the voltage adjustment sub-circuit 404 outputs the high voltage 424 to the reference voltage source 302, such that the reference voltage source 302 provides the reference voltage 328 to the op-amp non-inverting input 312, such that the op-amp 306 can operate normally.
Wherein, if the power supply circuit 20 receives the input voltage 50, then:
a first voltage across the first resistor 412 is the auxiliary voltage 214, a second voltage across the first zener diode 410
The anode voltage of the first diode 414 + the first voltage across the first resistor 412 + the first barrier voltage of the first diode 414-the second voltage across the first zener diode 410 + the first barrier voltage of the first diode 414-the auxiliary voltage 214
The high voltage 424 is the anode voltage of the first diode 414-the second barrier voltage of the second diode 416 is the auxiliary voltage 214-the second cross voltage of the first zener diode 410 + the first barrier voltage of the first diode 414-the second barrier voltage of the second diode 416
If the first barrier voltage of the first diode 414 is equal to the second barrier voltage of the second diode 416 (e.g., 0.7 volts), then:
the high voltage 424 is the auxiliary voltage 214 — the second voltage across the first zener diode 410
For example, if the auxiliary voltage 214 is 10 volts, and if the second voltage (i.e., breakdown voltage) of the first zener diode 410 is 7.5 volts, the high voltage 424 is 2.5 volts; if the reference voltage source 302 is a Zener diode with a breakdown voltage of 1.25 volts, the high voltage 424 (2.5 volts) delivered to the reference voltage source 302 will cause the reference voltage source 302 to provide the reference voltage 328 (1.25 volts) to the op-amp non-inverting input 312 so that the op-amp 306 operates normally.
Further, the operation of the operational amplifier 306 refers to: if the first voltage 320 at the non-inverting input 312 of the operational amplifier is less than the first voltage division 322 between the first voltage divider resistor 314 and the second voltage divider resistor 316, the operational amplifier 306 controls the pwm control sub-circuit 202 via the operational amplifier output 308 and the feedback sub-circuit 318 to decrease a conduction rate of the power switch 204 to decrease the output voltage 60; if the first voltage 320 at the non-inverting input 312 of the operational amplifier is greater than the first voltage division 322 between the first voltage dividing resistor 314 and the second voltage dividing resistor 316, the operational amplifier 306 controls the pwm control sub-circuit 202 via the operational amplifier output 308 and the feedback sub-circuit 318 to increase the conduction rate of the power switch 204 to increase the output voltage 60.
Furthermore, one end of the first zener diode 410 is connected to the auxiliary voltage generating sub-circuit 210, and the other end of the first zener diode 410 is connected to the voltage adjusting sub-circuit 404; one end of the first resistor 412 is connected to the voltage adjustment sub-circuit 404 and the other end of the first zener diode 410, and the other end of the first resistor 412 is connected to ground; one end of the first diode 414 is connected to the other end of the first zener diode 410 and one end of the first resistor 412; one end of the second diode 416 is connected to the other end of the first diode 414, and the other end of the second diode 416 is connected to the reference voltage source 302; one end of the second resistor 420 is connected to the feedback signal generating circuit 30, and the other end of the second resistor 420 is connected to the other end of the first diode 414 and one end of the second diode 416.
The utility model has the advantages that if the feedback signal generating circuit 30 still works during the period when the power supply circuit 20 stops receiving the input voltage 50, when the power supply circuit 20 receives the input voltage 50 again, the power supply circuit 20 can avoid generating the output overvoltage condition. Furthermore, in one embodiment of the present invention, if the operational amplifier 306 is still working during the period when the power supply circuit 20 stops receiving the input voltage 50, the power supply circuit 20 can avoid the output overvoltage condition when the power supply circuit 20 receives the input voltage 50 again, especially when the power supply circuit 20 is in a light load state or an unloaded state; wherein, if the operational amplifier 306 is still working during the time that the power supply circuit 20 stops receiving the input voltage 50, the operational amplifier 306 is forced to control the pwm control sub-circuit 202 through the operational amplifier output terminal 308 and the feedback sub-circuit 318 to decrease the output voltage 60.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited by the description, but should also be covered by the claims of the present invention. The present invention is capable of other embodiments, and various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A power supply device for suppressing transient voltage, applied to an input voltage, comprises:
a power supply circuit;
a feedback signal generating circuit electrically connected to the power supply circuit; and
a feedback signal control circuit electrically connected to the power supply circuit and the feedback signal generating circuit,
the feedback signal control circuit controls the feedback signal generating circuit to discharge under the condition that the power supply circuit stops receiving the input voltage, so that the feedback signal generating circuit controls the power supply circuit to reduce an output voltage, the power supply circuit receives the input voltage again, and the power supply circuit avoids generating an output overvoltage condition on the output voltage.
2. The power supply apparatus of claim 1, wherein the power supply circuit comprises:
an auxiliary voltage generating sub-circuit electrically connected to the feedback signal control circuit.
3. The power supply apparatus according to claim 2, wherein the feedback signal control circuit comprises:
a voltage detection sub-circuit electrically connected to the auxiliary voltage generation sub-circuit.
4. The power supply apparatus according to claim 3, wherein the feedback signal control circuit further comprises:
a voltage regulator sub-circuit electrically connected to the power supply circuit, the feedback signal generating circuit and the voltage detecting sub-circuit,
wherein the power supply circuit is configured such that, when the power supply circuit stops receiving the input voltage, the voltage detection sub-circuit detects that the auxiliary voltage generation sub-circuit stops generating an auxiliary voltage and the voltage detection sub-circuit notifies the voltage adjustment sub-circuit that the auxiliary voltage generation sub-circuit stops generating the auxiliary voltage, so that the voltage adjustment sub-circuit controls the feedback signal generation circuit to discharge.
5. The power supply apparatus according to claim 4, wherein the feedback signal generating circuit comprises:
a reference voltage source electrically connected to the voltage adjustment sub-circuit,
the voltage adjusting sub-circuit is configured to output a low voltage to the reference voltage source under the condition that the voltage adjusting sub-circuit controls the feedback signal generating circuit to discharge, so that the reference voltage source stops working.
6. The power supply apparatus according to claim 5, wherein the voltage detection sub-circuit comprises:
a first Zener diode electrically connected to the auxiliary voltage generating sub-circuit and the voltage adjusting sub-circuit; and
and the first resistor is electrically connected to the first Zener diode and the voltage adjusting sub-circuit.
7. The power supply apparatus of claim 6 wherein the voltage regulator sub-circuit comprises:
a first diode electrically connected to the first Zener diode and the first resistor;
a second diode electrically connected to the first diode and the reference voltage source; and
a second resistor electrically connected to the feedback signal generating circuit, the first diode and the second diode.
8. The power supply apparatus according to claim 7, wherein the feedback signal generating circuit further comprises:
an operational amplifier electrically connected to the reference voltage source and the second resistor; and
a feedback sub-circuit electrically connected to the operational amplifier, the power supply circuit and the second resistor,
wherein the operational amplifier comprises an operational amplifier output terminal, an operational amplifier inverting input terminal and an operational amplifier non-inverting input terminal; the output end of the operational amplifier is electrically connected to the feedback sub-circuit; the non-inverting input terminal of the operational amplifier is electrically connected to the reference voltage source.
9. The power supply apparatus according to claim 8, wherein the feedback signal generating circuit further comprises:
a first voltage dividing resistor electrically connected to the power supply circuit, the second resistor, the inverting input terminal of the operational amplifier and the feedback sub-circuit; and
a second voltage-dividing resistor electrically connected to the first voltage-dividing resistor and the inverting input terminal of the operational amplifier,
the reference voltage source is configured to set a first voltage at the non-inverting input terminal of the operational amplifier to be less than a first voltage division between the first voltage dividing resistor and the second voltage dividing resistor when the operational amplifier stops operating, so that the operational amplifier controls the power supply circuit through the output terminal of the operational amplifier and the feedback sub-circuit to reduce the output voltage.
10. The power supply apparatus of claim 9, wherein the power supply circuit further comprises:
a pulse width modulation control sub-circuit electrically connected to the feedback sub-circuit;
a power switch electrically connected to the PWM control sub-circuit;
a transformer electrically connected to the power switch and the auxiliary voltage generating sub-circuit;
a rectifying and filtering loop electrically connected to the transformer, the feedback sub-circuit, the first voltage dividing resistor and the second resistor; and
an output end capacitor electrically connected to the first voltage dividing resistor, the second resistor, the rectifying and filtering loop and the feedback sub-circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022190445.4U CN212413047U (en) | 2020-09-29 | 2020-09-29 | Power supply device for suppressing instantaneous voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022190445.4U CN212413047U (en) | 2020-09-29 | 2020-09-29 | Power supply device for suppressing instantaneous voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212413047U true CN212413047U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022190445.4U Active CN212413047U (en) | 2020-09-29 | 2020-09-29 | Power supply device for suppressing instantaneous voltage |
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| Country | Link |
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| CN (1) | CN212413047U (en) |
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- 2020-09-29 CN CN202022190445.4U patent/CN212413047U/en active Active
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