CN115955095A - Current limiting circuit and power supply - Google Patents
Current limiting circuit and power supply Download PDFInfo
- Publication number
- CN115955095A CN115955095A CN202211524419.8A CN202211524419A CN115955095A CN 115955095 A CN115955095 A CN 115955095A CN 202211524419 A CN202211524419 A CN 202211524419A CN 115955095 A CN115955095 A CN 115955095A
- Authority
- CN
- China
- Prior art keywords
- resistor
- current
- temperature
- output
- capacitor
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 125
- 239000003990 capacitor Substances 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a current-limiting circuit and a power supply, wherein the current-limiting circuit is applied to a power supply management chip; the current limiting circuit includes: the device comprises a temperature detection module, a current detection module, a first resistor and a second resistor; the current detection module outputs a current detection signal, the temperature detection module outputs a temperature detection signal, the current detection signal and the temperature detection signal are both voltage signals, and the current detection signal and the temperature detection signal are superposed and input to an overcurrent detection end of the power management chip; when the temperature value is greater than the preset temperature, the temperature detection signal is at a high level; when the temperature value is not greater than the preset temperature, the temperature detection signal is at a low level. When the temperature is higher, the over-current detection end is superposed with a voltage value, which is equivalent to reducing the current limiting value, so that the current limiting value of the chip can be adjusted, and the chip is prevented from being burnt due to overhigh temperature.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a current-limiting circuit and a power supply.
Background
The power management chip is a chip which plays roles in conversion, distribution and detection of electric energy and other electric energy management in the power supply and is mainly responsible for identifying the power supply amplitude, generating corresponding short moment waves and pushing a later-stage circuit to output power. The power management chip is usually provided with overcurrent detection to avoid the heating of a device with overlarge current and the occurrence of faults.
In the prior art, the current limiting value of a power management chip is fixed and cannot be adjusted according to actual application requirements. When the temperature of the power management chip is high, the power management chip does not limit current, and the temperature of the chip continuously rises, so that the chip is burnt, and the stability of the power supply is influenced.
Disclosure of Invention
The embodiment of the invention provides a current limiting circuit and a power supply, and aims to solve the problem that the current limiting value of a power supply management chip is fixed and the actual application requirements cannot be met in the prior art.
In a first aspect, an embodiment of the present invention provides a current limiting circuit, which is applied to a power management chip, where the power management chip is used to control a current of a power supply;
the current limiting circuit includes: the device comprises a temperature detection module, a current detection module, a first resistor and a second resistor; the output end of the temperature detection module is connected with the first end of the first resistor, and the second end of the first resistor is connected with the overcurrent detection end of the power management chip;
the output end of the current detection module is connected with the first end of the second resistor, and the second end of the second resistor is connected with the overcurrent detection end of the power management chip;
the current detection module is used for detecting the current of the power supply and outputting a current detection signal according to the current; the temperature detection module is used for detecting the current temperature value and outputting a temperature detection signal according to the temperature value; the current detection signal and the temperature detection signal are both voltage signals, and the current detection signal and the temperature detection signal are superposed and input into an overcurrent detection end of the power management chip;
when the temperature value is greater than the preset temperature, the temperature detection signal is at a high level; when the temperature value is not greater than the preset temperature, the temperature detection signal is at a low level.
Optionally, the temperature detection module includes: the device comprises a reference voltage unit, a temperature conversion unit, a comparison unit and an output unit;
the first input end of the comparison unit is connected with the output end of the temperature conversion unit, the second input end of the comparison unit is connected with the output end of the reference voltage unit, and the output end of the comparison unit is connected with the input end of the output unit; the output end of the output unit is connected with the output end of the temperature detection module.
Optionally, the temperature conversion unit includes: a thermistor and a third resistor;
the first end of the thermistor is used for being connected with a first direct current power supply, and the second end of the thermistor is respectively connected with the first end of the third resistor and the output end of the temperature conversion unit;
the second end of the third resistor is grounded.
Optionally, the temperature conversion unit further includes: a first diode;
the cathode of the first diode is connected with the output end of the temperature conversion unit, and the anode of the first diode is grounded.
Optionally, the comparing unit includes: the comparator, a fourth resistor, a fifth resistor and a sixth resistor;
the positive input end of the comparator is connected with the first input end of the comparison unit, the negative input end of the comparator is respectively connected with the first end of the fourth resistor and the first end of the fifth resistor, and the output end of the comparator is respectively connected with the second end of the fifth resistor, the first end of the sixth resistor and the output end of the comparison unit;
the second end of the fourth resistor is connected with the second input end of the comparison unit;
and the second end of the sixth resistor is used for being connected with the first direct current power supply.
Optionally, the comparing unit further includes: a first capacitor, a second capacitor and a third capacitor;
the first end of the first capacitor is connected with the positive input end of the comparator;
the first end of the second capacitor is connected with the negative input end of the comparator;
the first end of the third capacitor is connected with the output end of the comparator;
the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are all grounded.
Optionally, the output unit includes: the second diode, the third diode, the seventh resistor and the eighth resistor;
the anode of the second diode is connected with the second end of the seventh resistor and the first end of the eighth resistor respectively, and the cathode of the second diode is connected with the cathode of the third diode and the input end of the output unit respectively;
the first end of the seventh resistor is used for being connected with a second direct-current power supply;
and the anode of the third diode and the second end of the eighth resistor are both grounded.
Optionally, the output end of the power management chip is used for driving the switching tube; the current detection module includes: a current detection resistor;
the switch tube and the current detection resistor are connected in series in a current loop of the power supply;
the first end of the current detection resistor is connected with the second end of the switch tube and the output end of the current detection module respectively, and the second end of the current detection resistor is grounded.
Optionally, the current limiting circuit further comprises: a fourth capacitor;
the fourth capacitor is connected in parallel with the first resistor.
In a second aspect, an embodiment of the present invention provides a power supply, including the current limiting circuit according to the first aspect of the embodiment of the present invention.
The embodiment of the invention provides a current limiting circuit and a power supply. The current circuit is applied to a power management chip, and the power management chip is used for controlling the current of a power supply; the current limiting circuit includes: the device comprises a temperature detection module, a current detection module, a first resistor and a second resistor; the output end of the temperature detection module is connected with the first end of the first resistor, and the second end of the first resistor is connected with the overcurrent detection end of the power management chip; the output end of the current detection module is connected with the first end of the second resistor, and the second end of the second resistor is connected with the overcurrent detection end of the power management chip; the current detection module is used for detecting the current of the power supply and outputting a current detection signal according to the current; the temperature detection module is used for detecting the current temperature value and outputting a temperature detection signal according to the temperature value; the current detection signal and the temperature detection signal are both voltage signals, and are superposed and input to an overcurrent detection end of the power management chip; when the temperature value is greater than the preset temperature, the temperature detection signal is at a high level; when the temperature value is not greater than the preset temperature, the temperature detection signal is at a low level. In the embodiment of the invention, when the temperature is low, the temperature detection signal is at a low level, and the current limiting value is basically unchanged. When the temperature is higher, the temperature detection signal is at a high level, a voltage is superposed on the original current detection signal, which is equivalent to reducing the current limiting value of the chip, so that the chip can enter the current limiting mode when reaching a smaller current. The current limiting value of the chip can be automatically adjusted according to the temperature, continuous temperature rise caused by high-current work when the temperature of the chip is high is avoided, and the safety and the stability of a power supply are effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a current limiting circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a temperature detection module according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a temperature detection module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another current limiting circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a current limiting circuit according to an embodiment of the present invention is shown, and is applied to a power management chip U1, where the power management chip U1 is used to control a current of a power supply; the above current limiting circuit includes: the temperature detection module 11, the current detection module 12, the first resistor R1 and the second resistor R2;
the output end of the temperature detection module 11 Is connected with the first end of the first resistor R1, and the second end of the first resistor R1 Is connected with the overcurrent detection end Is of the power management chip U1;
the output end of the current detection module 12 Is connected with the first end of the second resistor R2, and the second end of the second resistor R2 Is connected with the overcurrent detection end Is of the power management chip U1;
the current detection module 12 is configured to detect a current of the power supply and output a current detection signal according to the current; the temperature detection module 11 is used for detecting a current temperature value and outputting a temperature detection signal according to the temperature value; the current detection signal and the temperature detection signal are both voltage signals, and the current detection signal and the temperature detection signal are superposed and input into an overcurrent detection end Is of the power management chip U1;
when the temperature value is greater than the preset temperature, the temperature detection signal is at a high level; and when the temperature value is not more than the preset temperature, the temperature detection signal is at a low level.
In the embodiment of the invention, when the current temperature is higher than the preset temperature, the current detection module 11 outputs a high level, which is equivalent to superimposing a voltage value on the basis of the original current detection signal, and the power management chip U1 enters the overcurrent protection when reaching a relatively small current, which is equivalent to reducing the current limit value. For example, the overcurrent value of the chip is 10A, the voltage is reflected to 1V, and the current is limited when the voltage of the current detection signal is 1V. When the temperature Is higher, a voltage Is superposed, when the voltage of the current detection signal Is 0.5V, the overcurrent detection end Is of the power supply management chip U1 reaches 1V, namely, the current Is limited when the output current of the power supply Is 5A, which Is equivalent to the reduction of the current limit value. Therefore, the current limiting value in the embodiment of the invention can be adaptively adjusted according to the temperature value, when the temperature is high, the current limiting value is reduced, and the power management chip U1 enters overcurrent protection at a low current, so that the situation that the chip is burnt down due to continuous temperature rise of the power management chip U1 caused by a large current is prevented, and the safety and the stability of the power supply are effectively improved.
The resistance values of the first resistor R1 and the second resistor R2 can be set according to practical application requirements, and are used for voltage matching and current limiting value adjustment.
In a possible implementation, referring to fig. 2, the temperature detection module 11 may include: a reference voltage unit 111, a temperature conversion unit 112, a comparison unit 113, and an output unit 114;
a first input end of the comparing unit 113 is connected with an output end of the temperature converting unit 112, a second input end of the comparing unit 113 is connected with an output end of the reference voltage unit 111, and an output end of the comparing unit 113 is connected with an input end of the output unit 114; the output end of the output unit 114 is connected with the output end of the temperature detection module 11.
In the embodiment of the present invention, the temperature conversion unit 112 is configured to convert the temperature value into a voltage value, and compare the voltage value with the reference voltage output by the reference voltage unit 111, so that the temperature detection module 11 outputs a high level when the temperature value is greater than the preset temperature; when the temperature value is not greater than the preset temperature, the temperature detection module 11 outputs a low level to realize the self-adaptive adjustment of the current limiting value. The output unit 114 is configured to adjust the voltage output by the comparing unit 113, so that the voltage output by the temperature detecting module 11 is matched with the rear end, and the application requirement can be met.
In one possible embodiment, referring to fig. 3, the temperature conversion unit 112 may include: a thermistor NTC and a third resistor R3;
a first end of the thermistor NTC is used for being connected with a first direct current power supply +12v _m, and a second end of the thermistor NTC is respectively connected with a first end of the third resistor R3 and an output end of the temperature conversion unit 112;
the second end of the third resistor R3 is grounded.
In the embodiment of the present invention, the thermistor is used to convert the temperature into the voltage, the thermistor NTC and the third resistor R3 divide the voltage, and the voltage output by the temperature conversion unit 112 changes along with the change of the temperature.
Further, the thermistor NTC may be a negative temperature coefficient thermistor. The temperature increases and the resistance value of the thermistor NTC decreases in response to an increase in the voltage output from the temperature conversion unit 112. Conversely, a decrease in temperature reflects a decrease in voltage.
In one possible implementation, referring to fig. 3, the temperature conversion unit 112 may further include: a first diode D1;
the cathode of the first diode D1 is connected to the output terminal of the temperature conversion unit 112, and the anode of the first diode D1 is grounded.
The first diode D1 is used for stabilizing voltage, and preventing the voltage output by the temperature conversion unit 112 from being too high and damaging the back-end device.
In a possible implementation, referring to fig. 3, the comparing unit 113 may include: the comparator U2, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
a positive input end of the comparator U2 is connected to the first input end of the comparing unit 113, a negative input end of the comparator U2 is connected to the first end of the fourth resistor R4 and the first end of the fifth resistor R5, respectively, and an output end of the comparator U2 is connected to the second end of the fifth resistor R5, the first end of the sixth resistor R6, and the output end of the comparing unit 113, respectively;
a second end of the fourth resistor R4 is connected to a second input end of the comparing unit 113;
the second end of the sixth resistor R6 is used for connecting to the first dc power supply +12v _m.
The comparison unit 113 is implemented by using a comparator U2, and when the temperature value is greater than the preset temperature value, the voltage rise output by the temperature conversion unit 112 is greater than the reference voltage, and the comparator U2 outputs a high level; conversely, a low temperature outputs a low level.
In a possible implementation, referring to fig. 3, the comparing unit 113 may further include: a first capacitor C1, a second capacitor C2 and a third capacitor C3;
a first end of the first capacitor C1 is connected with a positive input end of the comparator U2;
the first end of the second capacitor C2 is connected with the negative input end of the comparator U2;
the first end of the third capacitor C3 is connected with the output end of the comparator U2;
the second terminal of the first capacitor C1, the second terminal of the second capacitor C2, and the second terminal of the third capacitor C3 are all grounded.
The first capacitor C1, the second capacitor C2 and the third capacitor C3 are all used for filtering, so that the voltages of three terminals of the comparator U2 are stabilized, the output result of the comparison unit 113 is prevented from being influenced by noise interference, and the stability of the circuit is improved.
In a possible implementation manner, referring to fig. 3, the reference voltage unit 111 may generate the reference voltage by dividing the voltage through resistors, for example, referring to fig. 3, which is not described herein again.
In one possible implementation, referring to fig. 3, the output unit 114 may include: a second diode D2, a third diode D3, a seventh resistor R7, and an eighth resistor R8;
an anode of the second diode D2 is connected to the second end of the seventh resistor R7 and the first end of the eighth resistor R8, respectively, and a cathode of the second diode D2 is connected to a cathode of the third diode D3 and the input end of the output unit 114, respectively;
the first end of the seventh resistor R7 is used for being connected with a second direct-current power supply +3.3 VD;
the anode of the third diode D3 and the second end of the eighth resistor R8 are both grounded.
In order to ensure that the temperature detection signal is at a high level when the temperature value is greater than the preset temperature and at a low level when the temperature value is not greater than the preset temperature, the embodiment of the invention is provided with a second diode D2 and a third diode D3. Referring to fig. 3, when the temperature value is greater than the preset temperature value, the comparator U2 outputs a high level, the second diode D2 is turned off, and the temperature detection module 11 outputs a high level; when the temperature is not greater than the preset temperature value, the comparator U2 outputs a low level, the second diode D2 is conducted, and the temperature detection module 11 outputs a low level. Meanwhile, the seventh resistor R7 and the eighth resistor R8 are used for voltage division and are used for voltage matching, so that the voltage output by the temperature detection module 11 is within a preset range, and the application requirement is met.
The third diode D3 is used for limiting voltage, and preventing noise interference from affecting the output of the comparing unit 113, so that the output voltage of the comparing unit 113 is too low to affect the output voltage of the temperature detecting module 11.
In a possible implementation, referring to fig. 4, the output terminal of the power management chip U1 is used to drive the switching tube Q1; the current detection module 12 may include: a current detection resistor Rs;
the switching tube Q1 and the over-current detection resistor Rs are connected in series in a current loop of the power supply;
the first end of the current detection resistor Rs is connected with the second end of the switch tube Q1 and the output end of the current detection module 12 respectively, and the second end of the current detection resistor Rs is grounded. In the embodiment of the invention, the second end of the current detection resistor Rs is directly grounded, the second end of the second resistor R2 is directly connected with the first end of the current detection resistor Rs, and the voltage of the current detection resistor Rs reflects the current of the power supply.
In one possible implementation, referring to fig. 4, the current limiting circuit may further include: a fourth capacitor C4;
the fourth capacitor C4 is connected in parallel with the first resistor R1.
The fourth capacitor C4 is used for filtering.
In one possible embodiment, the voltage of the first dc power supply +12v _mmay be 12V, and the voltage of the second dc power supply +3.3VD may be 3.3V for outputting a suitable voltage. Specifically, the voltage values of the two dc power supplies may also be adjusted according to the actual application requirements.
Corresponding to any one of the current limiting circuits, an embodiment of the present invention further provides a power supply, which includes any one of the current limiting circuits and has advantages of the current limiting circuit, and further description thereof is omitted.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The current limiting circuit is applied to a power management chip, and the power management chip is used for controlling the current of a power supply;
the current limiting circuit includes: the device comprises a temperature detection module, a current detection module, a first resistor and a second resistor; the output end of the temperature detection module is connected with the first end of the first resistor, and the second end of the first resistor is connected with the overcurrent detection end of the power management chip;
the output end of the current detection module is connected with the first end of the second resistor, and the second end of the second resistor is connected with the overcurrent detection end of the power management chip;
the current detection module is used for detecting the current of the power supply and outputting a current detection signal according to the current; the temperature detection module is used for detecting a current temperature value and outputting a temperature detection signal according to the temperature value; the current detection signal and the temperature detection signal are both voltage signals, and the current detection signal and the temperature detection signal are superposed and input to an overcurrent detection end of the power management chip;
when the temperature value is greater than the preset temperature, the temperature detection signal is at a high level; and when the temperature value is not greater than the preset temperature, the temperature detection signal is at a low level.
2. The current-limiting circuit of claim 1, wherein the temperature detection module comprises: the device comprises a reference voltage unit, a temperature conversion unit, a comparison unit and an output unit;
a first input end of the comparison unit is connected with an output end of the temperature conversion unit, a second input end of the comparison unit is connected with an output end of the reference voltage unit, and an output end of the comparison unit is connected with an input end of the output unit; and the output end of the output unit is connected with the output end of the temperature detection module.
3. The current-limiting circuit of claim 2, wherein the temperature conversion unit comprises: a thermistor and a third resistor;
the first end of the thermistor is used for being connected with a first direct current power supply, and the second end of the thermistor is respectively connected with the first end of the third resistor and the output end of the temperature conversion unit;
and the second end of the third resistor is grounded.
4. The current-limiting circuit of claim 3, wherein the temperature conversion unit further comprises: a first diode;
the cathode of the first diode is connected with the output end of the temperature conversion unit, and the anode of the first diode is grounded.
5. The current-limiting circuit of claim 2, wherein the comparing unit comprises: the comparator, a fourth resistor, a fifth resistor and a sixth resistor;
a positive input end of the comparator is connected with the first input end of the comparison unit, a negative input end of the comparator is connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, and an output end of the comparator is connected with the second end of the fifth resistor, the first end of the sixth resistor and the output end of the comparison unit respectively;
a second end of the fourth resistor is connected with a second input end of the comparison unit;
and the second end of the sixth resistor is used for being connected with a first direct current power supply.
6. The current-limiting circuit of claim 5, wherein the comparison unit further comprises: a first capacitor, a second capacitor and a third capacitor;
the first end of the first capacitor is connected with the positive input end of the comparator;
the first end of the second capacitor is connected with the negative input end of the comparator;
the first end of the third capacitor is connected with the output end of the comparator;
the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are all grounded.
7. The current-limiting circuit of claim 2, wherein the output unit comprises: the second diode, the third diode, the seventh resistor and the eighth resistor;
the anode of the second diode is connected with the second end of the seventh resistor and the first end of the eighth resistor respectively, and the cathode of the second diode is connected with the cathode of the third diode and the input end of the output unit respectively;
the first end of the seventh resistor is used for being connected with a second direct-current power supply;
and the anode of the third diode and the second end of the eighth resistor are both grounded.
8. The current-limiting circuit according to any one of claims 1 to 7, wherein the output terminal of the power management chip is used for driving a switching tube; the current detection module includes: a current detection resistor;
the switch tube and the current detection resistor are connected in series in a current loop of the power supply;
the first end of the current detection resistor is respectively connected with the second end of the switch tube and the output end of the current detection module, and the second end of the current detection resistor is grounded.
9. The current-limiting circuit of any of claims 1 to 7, further comprising: a fourth capacitor;
the fourth capacitor is connected in parallel with the first resistor.
10. A power supply, comprising: the current limiting circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211524419.8A CN115955095A (en) | 2022-11-30 | 2022-11-30 | Current limiting circuit and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211524419.8A CN115955095A (en) | 2022-11-30 | 2022-11-30 | Current limiting circuit and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115955095A true CN115955095A (en) | 2023-04-11 |
Family
ID=87285076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211524419.8A Pending CN115955095A (en) | 2022-11-30 | 2022-11-30 | Current limiting circuit and power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115955095A (en) |
-
2022
- 2022-11-30 CN CN202211524419.8A patent/CN115955095A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6462971B1 (en) | Method and apparatus providing a multi-function terminal for a power supply controller | |
| CN103151910B (en) | Undervoltage protection circuit, under-voltage protection method and switching power supply | |
| US9906120B2 (en) | Overcurrent protection system and method for inverter circuit | |
| US20060209581A1 (en) | Terminal for multiple functions in a power supply | |
| US11190095B2 (en) | Isolated switching converter, control circuit and control method thereof | |
| US11955893B2 (en) | Switching power supply, power adapter and charger | |
| US9729043B2 (en) | Power conversion apparatus and protection method thereof while feedback current signal being abnormal | |
| US20210320515A1 (en) | Charging device and charging method | |
| CN213846230U (en) | Overcurrent protection circuit | |
| US20180342955A1 (en) | Second boost circuit for dc voltage input | |
| CN217445265U (en) | Current limit control circuit | |
| CN102545663B (en) | Overpower compensation circuit suitable for current mode switching power supply | |
| CN109245530B (en) | Circuit for stabilizing output signal and power converter | |
| CN114336561A (en) | Direct current surge voltage suppression circuit | |
| US9343977B2 (en) | Power conversion apparatus and over power protection method thereof | |
| CN115955095A (en) | Current limiting circuit and power supply | |
| JP3178972B2 (en) | Self-excited flyback converter | |
| TWI625032B (en) | Low phase surge protection device | |
| CN212231336U (en) | Switching power supply, power adapter and charger | |
| US11342839B2 (en) | Power supply apparatus with operation mode adjustment function and method of operating the same | |
| US20120206847A1 (en) | Electronic circuit breaker of a power supply having dual output ports | |
| CN220368605U (en) | Output protection circuit and switching power supply | |
| CN116960911B (en) | Current-limiting protection circuit, power supply circuit and energy storage power supply | |
| CN219322275U (en) | Power supply circuit, auxiliary power supply and electronic equipment | |
| CN217883217U (en) | Protection circuit, drive chip and switching power supply |
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 |