CN117498269A - Soft start direct current input overvoltage protection circuit and medical equipment - Google Patents
Soft start direct current input overvoltage protection circuit and medical equipment Download PDFInfo
- Publication number
- CN117498269A CN117498269A CN202311481726.7A CN202311481726A CN117498269A CN 117498269 A CN117498269 A CN 117498269A CN 202311481726 A CN202311481726 A CN 202311481726A CN 117498269 A CN117498269 A CN 117498269A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- capacitor
- soft
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims description 55
- 230000005669 field effect Effects 0.000 claims description 18
- 238000001914 filtration Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005670 electromagnetic radiation 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
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- 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
Abstract
The invention relates to the technical field of electronic circuits, and discloses a soft-start direct-current input overvoltage protection circuit and medical equipment, wherein the soft-start direct-current input overvoltage protection circuit comprises: the device comprises a soft start circuit, an overvoltage circuit and a switch circuit, wherein a first end of the soft start circuit is connected with an external power supply, a second end of the soft start circuit is connected with the switch circuit, and a third end of the soft start circuit is grounded; the first end of the overvoltage circuit is connected with an external power supply, the second end of the overvoltage circuit is connected with the soft start, and the third end of the overvoltage circuit is grounded; the switch circuit is also connected with the post-stage circuit. By adopting the circuit design, the voltage stress and the current stress of the device can be effectively reduced, the circuit design cost is reduced, the starting overshoot of the electronic circuit is effectively eliminated, the reliability of the circuit can be greatly improved, and meanwhile, the device cost of the circuit can not be increased greatly.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a soft-start direct-current input overvoltage protection circuit and medical equipment.
Background
In order to reduce output ripple in the current electronic circuit, a large-capacity capacitor is generally connected to the output end of the current electronic circuit for decoupling filtering, and the voltage of the output filtering capacitor is zero at the moment of circuit starting, so that larger capacitor charging current can be generated during power-on, larger current impact is brought to the rectifying and filtering device, and the service life and the working reliability of electronic components in the circuit are seriously affected.
Disclosure of Invention
In view of the above, the invention provides a soft-start direct current input overvoltage protection circuit and medical equipment, so as to solve the problem of current impact caused by too large capacitor charging current at the moment of circuit start.
In a first aspect, the present invention provides a soft start dc input overvoltage protection circuit, comprising: the device comprises a soft start circuit, an overvoltage circuit and a switch circuit, wherein a first end of the soft start circuit is connected with an external power supply, a second end of the soft start circuit is connected with the switch circuit, and a third end of the soft start circuit is grounded; the first end of the overvoltage circuit is connected with an external power supply, the second end of the overvoltage circuit is connected with the soft start circuit, and the third end of the overvoltage circuit is grounded; the switch circuit is also connected with a post-stage circuit.
By adopting the circuit design, the voltage stress and the current stress of the device can be effectively reduced, the circuit design cost is reduced, the starting overshoot of the electronic circuit is effectively eliminated, the reliability of the circuit can be greatly improved, and meanwhile, the device cost of the circuit can not be increased greatly.
In an alternative embodiment, the soft start circuit includes: the first end of the first resistor is connected with an external power supply, and the second end of the first resistor is respectively connected with the first end of the first capacitor, the first end of the second resistor and the switch circuit; the second end of the first capacitor and the second end of the second resistor are grounded.
When the external power supply is normally electrified, the soft start circuit is utilized to control the time of the soft start of the power-on of the switching circuit, so that the current stress of the later-stage circuit is effectively reduced.
In an alternative embodiment, the overvoltage circuit includes: the first end of the third resistor is connected with an external power supply, and the second end of the third resistor is respectively connected with the negative electrode of the first diode and the first end of the fourth resistor; the positive electrode of the first diode is grounded; the second end of the fourth resistor is respectively connected with the anode of the second diode and the base electrode of the triode; the cathode of the second diode is connected with an external power supply; the emitter of the triode is connected with an external power supply, and the collector of the triode is respectively connected with the second end of the first resistor and the first end of the first capacitor.
In an alternative embodiment, the switching circuit includes: the source electrode of the field effect tube is connected with an external power supply, the grid electrode of the field effect tube is respectively connected with the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor, and the drain electrode of the field effect tube is connected with a rear-stage circuit.
When the external power supply is higher than the set overvoltage protection point, the overvoltage circuit and the soft start circuit work cooperatively to cut off the switching circuit, so that the power supply of the rear-stage circuit is disconnected, and the overvoltage protection of the rear-stage circuit is realized. When the external power supply is restored to the effective range, the switching circuit is turned on again by the soft start circuit, so that power supply to the later-stage circuit is realized.
In an alternative embodiment, the soft start dc input overvoltage protection circuit further comprises: and the buffer circuit is connected with the switch circuit in parallel.
Electromagnetic radiation of the switch state of the PMOS tube can be effectively reduced through the parallel buffer circuit, and interference of the circuit to the outside is reduced.
In an alternative embodiment, the buffer circuit includes: the first end of the fifth resistor is connected with the source electrode of the field effect transistor, and the second end of the fifth resistor is connected with the first end of the second capacitor; and the second end of the second capacitor is connected with the drain electrode of the field effect transistor.
In an alternative embodiment, the soft start dc input overvoltage protection circuit further comprises: and the first end of the filter circuit is connected with an external power supply, and the second end of the filter circuit is grounded.
Decoupling filtering is performed by a filtering circuit, so that output ripple is reduced.
In an alternative embodiment, the filter circuit includes: the first end of the sixth resistor is connected with an external power supply, and the second end of the sixth resistor is connected with the first end of the third capacitor; the second end of the third capacitor is grounded.
In an alternative embodiment, the field effect transistor is a PMOS transistor.
In a second aspect, the present invention provides a medical device comprising: the soft-start dc-input overvoltage protection circuit of the first aspect.
The soft-start direct current input overvoltage protection circuit is adopted in the medical equipment, so that the voltage stress and the current stress of devices in the medical equipment can be effectively reduced, and the design cost of the medical equipment is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a soft-start DC input overvoltage protection circuit in an embodiment of the invention;
FIG. 2 is a schematic diagram of a soft start DC input overvoltage protection circuit in accordance with an embodiment of the present invention;
fig. 3 is a schematic block diagram of a soft-start dc input overvoltage protection circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In order to reduce output ripple in the current electronic circuit, a large-capacity capacitor is generally connected to the output end of the current electronic circuit for decoupling filtering, and the voltage of the output filtering capacitor is zero at the moment of circuit starting, so that larger capacitor charging current can be generated during power-on, larger current impact is brought to the rectifying and filtering device, and the service life and the working reliability of electronic components in the circuit are seriously affected. Therefore, it is necessary to reduce the current stress of the device, and therefore, the invention provides a soft start direct current input overvoltage protection circuit.
As shown in fig. 1, the soft start dc input overvoltage protection circuit includes: soft start circuit, overvoltage circuit and switch circuit. The first end of the soft start circuit is connected with an external power supply, the second end of the soft start circuit is connected with the switch circuit, and the third end of the soft start circuit is grounded. The first end of the overvoltage circuit is connected with an external power supply, the second end of the overvoltage circuit is connected with the soft start circuit, and the third end of the overvoltage circuit is grounded. The switch circuit is also connected with the post-stage circuit.
In a specific embodiment, when the external power supply is normally powered on, the soft start circuit is used for controlling the time of the soft start of the power on the switching circuit, so that the current stress of the later-stage circuit is effectively reduced. When the external power supply is higher than the set overvoltage protection point, the overvoltage circuit and the soft start circuit work cooperatively to cut off the switching circuit, so that the power supply of the later-stage circuit is cut off. When the external power supply is restored to the effective range, the switching circuit is turned on again by the soft start circuit, so that power supply to the later-stage circuit is realized.
By adopting the circuit design, the voltage stress and the current stress of the device can be effectively reduced, the circuit design cost is reduced, the starting overshoot of the electronic circuit is effectively eliminated, the reliability of the circuit can be greatly improved, and meanwhile, the device cost of the circuit can not be increased greatly.
In an alternative embodiment, as shown in fig. 2, the soft start circuit includes: the first resistor R1, the first capacitor C1 and the second resistor R2. The first end of the first resistor R1 is connected with an external power supply, and the second end of the first resistor R1 is connected with the first end of the first capacitor C1, the first end of the second resistor R2 and the switch circuit respectively. The second end of the first capacitor C1 and the second end of the second resistor R2 are grounded.
As shown in fig. 2, the overvoltage circuit includes: the third resistor R3, the fourth resistor R4, the first diode D1, the second diode D2 and the triode Q1. The first end of the third resistor R3 is connected to an external power source, and the second end of the third resistor R3 is connected to the negative electrode of the first diode D1 and the first end of the fourth resistor R4, respectively. The anode of the first diode D1 is grounded. The second end of the fourth resistor R4 is connected to the positive electrode of the second diode D2 and the base electrode of the triode Q1, respectively. The cathode of the second diode D2 is connected to an external power source. The emitter of the triode Q1 is connected with an external power supply, and the collector of the triode Q1 is respectively connected with the second end of the first resistor R1 and the first end of the first capacitor C1.
As shown in fig. 2, the switching circuit includes: the source electrode of the field effect tube Q2 is connected with an external power supply, the grid electrode of the field effect tube Q2 is respectively connected with the second end of the first resistor R1, the first end of the second resistor R2 and the first end of the first capacitor C1, and the drain electrode of the field effect tube Q2 is connected with a later-stage circuit. Wherein, the field effect transistor Q2 is a PMOS transistor.
In one embodiment, the external power source V in During normal power-on, the input bus voltage charges the capacitor C1 through a resistor R1 and a capacitor C1 loop. Since the voltage across the capacitor C1 cannot be suddenly changed, it
Voltage across the terminalsRises exponentially from 0, where U c For the voltage across the capacitor C1, the time constant τ=r×c, where R is the value of R1, and C is the value of C1. When the charging voltage at two ends of the capacitor C1 reaches the opening voltage of the PMOS tube, the PMOS tube is opened, but the on-resistance is larger at the moment, so that overdrive processing is required to be carried out on the PMOS tube. With the charging process of the capacitor C1 continued, the terminal voltage of the capacitor C1 continues to rise, when the voltage value is equal to V in * When R2/(R2+R1), the charging process of the capacitor C1 is ended, and the PMOS tube is in an overdrive state, so that the direct-current on-resistance is obviously reduced, and the direct-current on-loss is reduced to the minimum. During normal start-up, due to external power supply V in The working voltage of the zener diode D1 is not reached, the resistor R3 and the loop of the zener diode D1 are not conducted, and the base electrode of the triode Q1 is pulled up to V through the resistor R3 and the resistor R4 in No current flows through the resistor R3 and the resistor R4, the emitter junction BE of the triode Q1 is in a closed state, the CE loop of the triode Q1 is not conducted, the capacitor C1 is in a leading effect, and the soft start power-on time sequence of the circuit is controlled. The protection diode D2 is used for protecting the BE loop voltage of the triode Q1 from exceeding the range, and the protection diode D2 is used for clamping the loop voltage. The anti-parallel protection diode D2 can effectively protect the PNP triode, the overdrive PMOS tube can effectively reduce the direct current conduction loss of the PMOS tube, and the design method improves the reliability of the circuit.
When the external power V in When the overvoltage signal exceeds the conducting voltage of the protection diode D2, the loop of the BE transmitting junction of the resistor R4 and the triode Q1 is conducted, the CE of the triode Q1 is conducted, and the upper end of the capacitor C1 is pulled to V in Voltage of capacitor C1 starts to charge up to V in . When the voltage of the end of the capacitor C1 is charged to the break-off voltage of the PMOS tube, the PMOS tube starts to exit from the conducting state. When the voltage at the C1 end of the capacitor is charged to V in When the PMOS tube is completely closed, thereby making the backThe stage circuit is completely closed by overvoltage, so that overvoltage protection of the subsequent stage circuit is realized.
When the external power V in And when the input voltage is restored to the effective range, namely the input voltage is restored to the normal voltage input, the voltage at the end of the capacitor C1 is discharged to an external power supply through the resistor R1, and the voltage at the end of the capacitor C1 is reduced. At the same time, the resistor R3 and zener diode D1 are turned off due to the drop of the input voltage, which can be seen as removing transistor Q1 from the circuit. When the voltage of the C1 terminal of the capacitor drops to V in In the time, according to ohm's law, the upper voltage of the resistor R2 is V in * R2/(R2+R1), the charge of the capacitor C1 continues to be discharged through the resistor R1, thereby reducing its voltage to V in * R2/(R2+R1), at this time, the PMOS tube is opened again, the power supply of the later-stage circuit is opened, and the circuit can work normally.
In the embodiment of the invention, when the power supply is normally electrified, the soft start time of the power supply on the switching circuit is controlled by controlling the charging capacitance value of the capacitor C1 in the soft start circuit, so that the current stress of the later-stage circuit is effectively reduced. When the voltage of the power input end generates an overvoltage signal, the PMOS tube is slowly closed under the cooperation of the overvoltage circuit and the soft start circuit, and the power supply of the rear-stage circuit is disconnected, so that the overvoltage protection of the rear-stage circuit is realized. When the voltage of the power input end is recovered to be normally supplied, the soft start circuit is utilized to turn on the switching circuit again, so that the power supply of the later-stage circuit is realized. The circuit can reduce the voltage stress and the current stress of the device, is beneficial to reducing the design cost of the circuit, and effectively eliminates the starting overshoot of the electronic circuit. And the circuit structure is relatively simple, and the integration is convenient.
In an alternative embodiment, as shown in fig. 3, the soft-start dc input overvoltage protection circuit further includes: and the buffer circuit is connected with the switch circuit in parallel.
In one embodiment, as shown in fig. 2, the buffer circuit includes: fifth resistor R5 and second capacitor C2. The first end of the fifth resistor R5 is connected to the source of the field effect transistor Q2, the second end of the fifth resistor R5 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the drain of the field effect transistor Q2.
In the embodiment of the invention, the parallel buffer circuit can effectively reduce electromagnetic radiation of the switch state of the PMOS tube and reduce the interference of the circuit to the outside.
In an alternative embodiment, as shown in fig. 3, the soft-start dc input overvoltage protection circuit further includes: and the first end of the filter circuit is connected with an external power supply, and the second end of the filter circuit is grounded.
In one embodiment, as shown in fig. 2, the filtering circuit includes: sixth resistor R6 and third capacitor C3. The first end of the sixth resistor R6 is connected to an external power source, the second end of the sixth resistor R6 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.
In the embodiment of the invention, decoupling filtering is performed by the filtering circuit, so that output ripple waves are reduced.
The present invention also provides a medical device comprising: the soft start direct current input overvoltage protection circuit.
In a specific embodiment, the soft-start direct current input overvoltage protection circuit is adopted in the medical equipment, so that voltage stress and current stress of devices in the medical equipment can be effectively reduced, and the design cost of the medical equipment is facilitated.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A soft start dc input overvoltage protection circuit comprising: soft start circuit, overvoltage circuit and switch circuit, wherein,
the first end of the soft start circuit is connected with an external power supply, the second end of the soft start circuit is connected with the switch circuit, and the third end of the soft start circuit is grounded;
the first end of the overvoltage circuit is connected with an external power supply, the second end of the overvoltage circuit is connected with the soft start circuit, and the third end of the overvoltage circuit is grounded;
the switch circuit is also connected with a post-stage circuit.
2. The soft-start dc input overvoltage protection circuit of claim 1, wherein the soft-start circuit comprises: a first resistor, a first capacitor and a second resistor, wherein,
the first end of the first resistor is connected with an external power supply, and the second end of the first resistor is respectively connected with the first end of the first capacitor, the first end of the second resistor and the switch circuit;
the second end of the first capacitor and the second end of the second resistor are grounded.
3. The soft-start dc input overvoltage protection circuit of claim 2, wherein the overvoltage circuit comprises: a third resistor, a fourth resistor, a first diode, a second diode and a triode, wherein,
the first end of the third resistor is connected with an external power supply, and the second end of the third resistor is connected with the negative electrode of the first diode and the first end of the fourth resistor respectively;
the positive electrode of the first diode is grounded;
the second end of the fourth resistor is respectively connected with the anode of the second diode and the base electrode of the triode;
the cathode of the second diode is connected with an external power supply;
the emitter of the triode is connected with an external power supply, and the collector of the triode is respectively connected with the second end of the first resistor and the first end of the first capacitor.
4. The soft-start dc input overvoltage protection circuit of claim 2, wherein the switching circuit comprises: the source electrode of the field effect tube is connected with an external power supply, the grid electrode of the field effect tube is respectively connected with the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor, and the drain electrode of the field effect tube is connected with a rear-stage circuit.
5. The soft-start dc input overvoltage protection circuit of claim 4, further comprising: and the buffer circuit is connected with the switch circuit in parallel.
6. The soft-start dc input overvoltage protection circuit of claim 5, further comprising: the buffer circuit includes: a fifth resistor and a second capacitor, wherein,
the first end of the fifth resistor is connected with the source electrode of the field effect transistor, and the second end of the fifth resistor is connected with the first end of the second capacitor;
and the second end of the second capacitor is connected with the drain electrode of the field effect transistor.
7. The soft start dc input overvoltage protection circuit of claim 1, further comprising: and the first end of the filter circuit is connected with an external power supply, and the second end of the filter circuit is grounded.
8. The soft-start dc input overvoltage protection circuit of claim 7, wherein the filter circuit comprises: a sixth resistor and a third capacitor, wherein,
the first end of the sixth resistor is connected with an external power supply, and the second end of the sixth resistor is connected with the first end of the third capacitor;
the second end of the third capacitor is grounded.
9. The soft start dc input overvoltage protection circuit of claim 4, wherein the field effect transistor is a PMOS transistor.
10. A medical device, comprising: a soft start dc input overvoltage protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311481726.7A CN117498269A (en) | 2023-11-08 | 2023-11-08 | Soft start direct current input overvoltage protection circuit and medical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311481726.7A CN117498269A (en) | 2023-11-08 | 2023-11-08 | Soft start direct current input overvoltage protection circuit and medical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117498269A true CN117498269A (en) | 2024-02-02 |
Family
ID=89667080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311481726.7A Pending CN117498269A (en) | 2023-11-08 | 2023-11-08 | Soft start direct current input overvoltage protection circuit and medical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117498269A (en) |
-
2023
- 2023-11-08 CN CN202311481726.7A patent/CN117498269A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9667055B2 (en) | Over-voltage protection apparatus and method of operating the same | |
| CN213243514U (en) | Protection circuit and electronic equipment | |
| CN109196751B (en) | Charging device and terminal | |
| CN210350768U (en) | Protective circuit | |
| CN111668809A (en) | Power supply voltage control circuit and GPRS module | |
| CN117498269A (en) | Soft start direct current input overvoltage protection circuit and medical equipment | |
| CN116667301A (en) | High-compatibility impact current suppression circuit | |
| CN110739665A (en) | Protection circuit and switching power supply | |
| CN213990127U (en) | Switch protection circuit and switch power supply with same | |
| CN113746079B (en) | Hot plug circuit, control device and equipment | |
| CN113296028B (en) | Direct current load fault detection circuit and household electrical appliance with same | |
| CN115800973A (en) | Dynamic active clamping circuit of IGBT | |
| CN111009958B (en) | Power supply control circuit | |
| CN110854961A (en) | Power-on impact current suppression circuit | |
| CN217160075U (en) | Novel stroboscopic circuit removes | |
| CN211089114U (en) | Protection circuit and electronic equipment | |
| CN113442747B (en) | Charging circuit and charging device for new energy vehicle and new energy vehicle | |
| CN112332365B (en) | Power supply high-voltage protection circuit and driving power supply | |
| CN218940678U (en) | Power input protection circuit | |
| CN113346467B (en) | Surge protection circuit and alternating current charging circuit | |
| CN218415801U (en) | Overvoltage protection circuit | |
| CN217769472U (en) | Power supply circuit, power module and movable platform | |
| CN220066868U (en) | Overvoltage protection circuit and system | |
| CN216530539U (en) | Input overvoltage protection circuit and DC-DC switching power supply module | |
| CN217563310U (en) | Undervoltage protection circuit and power supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |