CN111123147B - Load short-circuit current detection module and system thereof - Google Patents
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Abstract
The invention relates to the field of electronic circuits, in particular to a load short-circuit current detection module and a system thereof. The module comprises a voltage output unit, a voltage output unit and a voltage output unit, wherein the voltage output unit is used for outputting a fixed voltage signal; the current-voltage conversion unit is used for converting the short-circuit current signal into a corresponding first voltage signal; the input end of the first comparison unit is respectively connected with the current-voltage conversion unit and the voltage output unit; the voltage regulating unit is connected with the output end of the first comparing unit; the input end of the second comparison unit is respectively connected with the current-voltage conversion unit and the voltage regulation unit; the first comparison unit receives the fixed voltage signal and the first voltage signal, compares the fixed voltage signal and the first voltage signal and outputs a comparison result to the voltage regulation unit, the voltage regulation unit receives the comparison result and regulates and outputs a second voltage signal, and the second comparison unit receives the first voltage signal and the second voltage signal and compares the first voltage signal and the second voltage signal and outputs a short-circuit voltage signal to realize short-circuit current detection.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a load short-circuit current detection module and a system thereof.
Background
Effective load short-circuit protection measures are required in a power supply system, so that the system is protected from being damaged, and switch components are protected from being damaged. At the same time, it is desirable that the instantaneous overload capability of the power supply system is strong enough to start inductive loads, capacitive loads, and variable resistance loads, such as motors, capacitor circuits, and halogen lamps. The instantaneous overload capacity and the sensitivity of short-circuit protection are contradictory.
The existing circuit for detecting the load short-circuit current usually uses a fixed comparison signal and outputs a short-circuit voltage signal after increasing the time delay. If the comparison signal is smaller or the time delay is longer, the response to the instantaneous large short-circuit current cannot be carried out; if the comparison signal is large, it cannot respond to a slightly smaller short-circuit current for a long time. Both of these situations may cause protection failure.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a load short-circuit current detection module and a system thereof, aiming at the above-mentioned defects in the prior art, so as to overcome the problem that the existing load short-circuit current detection cannot give consideration to both a large short-circuit current at the moment of response and a small short-circuit current for a long time.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a load short-circuit current detection module including:
the voltage output unit is used for outputting a fixed voltage signal;
the current-voltage conversion unit is used for converting the external short-circuit current signal into a corresponding first voltage signal;
the input end of the first comparison unit is respectively connected with the current-voltage conversion unit and the voltage output unit;
the voltage regulating unit is connected with the output end of the first comparing unit; and
the input end of the second comparison unit is respectively connected with the current-voltage conversion unit and the voltage regulation unit; wherein the content of the first and second substances,
the first comparison unit receives a fixed voltage signal and a first voltage signal, compares the fixed voltage signal and the first voltage signal, and outputs a comparison result to the voltage regulation unit, the voltage regulation unit receives the comparison result and regulates and outputs a second voltage signal, and the second comparison unit receives the first voltage signal and the second voltage signal, compares the first voltage signal and the second voltage signal, and outputs a short-circuit voltage signal to realize short-circuit current detection.
Further preferred embodiments of the present invention are: the load short-circuit current detection module further comprises a bolt-lock unit connected with the first comparison unit and/or the second comparison unit, and the bolt-lock unit continuously transmits the short-circuit voltage signal output by the second comparison unit to the input end of the first comparison unit and/or the second comparison unit so as to realize that the second comparison unit continuously outputs the short-circuit voltage signal.
Further preferred embodiments of the present invention are: the bolt-lock unit comprises an isolation unit and a locking unit, the isolation unit isolates a first voltage signal and transmits the first voltage signal to the first comparison unit and/or the second comparison unit after an external short-circuit current signal disappears, and the locking unit continuously transmits the short-circuit voltage signal output by the second comparison unit to the input end of the first comparison unit and/or the input end of the second comparison unit.
Further preferred embodiments of the present invention are: the isolation unit comprises a first resistor, one end of the first resistor is connected with the current-voltage conversion unit, the other end of the first resistor is connected with the input end of the first comparison unit, the input end of the second comparison unit and one end of the locking unit, and the other end of the locking unit is connected with the output end of the second comparison unit.
Further preferred embodiments of the present invention are: the locking unit comprises at least one diode and a second resistor, the anode of the diode is connected with the output end of the second comparison unit, the cathode of the diode is connected with the input end of the second comparison unit and the input end of the first comparison unit, one end of the second resistor is connected with the anode of the diode and the output end of the second comparison unit, and the other end of the second resistor is connected with the power supply.
Further preferred embodiments of the present invention are: the first comparison unit comprises a first comparator, the positive input end of the first comparator is connected with the voltage output unit, the negative input end of the first comparator is connected with the current-voltage conversion unit, and the output end of the first comparator is connected with the input end of the voltage regulation unit.
Further preferred embodiments of the present invention are: the second comparing unit comprises a second comparator, a positive input end of the second comparator is connected with the current-voltage converting unit, and a negative input end of the second comparator is connected with an output end of the voltage regulating unit.
Further preferred embodiments of the present invention are: the voltage output unit comprises a third resistor and a fourth resistor, the input end of the first comparison unit is connected with one end of the third resistor and one end of the fourth resistor respectively, the other end of the third resistor is connected with the power supply, and the other end of the fourth resistor is grounded.
Further preferred embodiments of the present invention are: the voltage regulating unit comprises a fifth resistor, a sixth resistor and a capacitor, one end of the fifth resistor is connected with the output end of the first comparing unit, the other end of the fifth resistor is connected with one end of the sixth resistor and one end of the capacitor respectively, the other end of the sixth resistor is connected with the power supply, and the other end of the capacitor is grounded.
The technical scheme adopted by the invention for solving the technical problems is as follows: the load short-circuit current detection system comprises the load short-circuit current detection module and a short-circuit current signal output end connected with a current-voltage conversion unit of the load short-circuit current detection module, wherein the current-voltage conversion unit converts a short-circuit current signal output by the short-circuit current signal output end into a corresponding first voltage signal and transmits the first voltage signal to the input end of a first comparison unit and the input end of a second comparison unit.
Compared with the prior art, the load short-circuit protection circuit has the advantages that the voltage regulation unit is arranged, the second voltage signal is regulated and output according to the comparison result of the first voltage signal corresponding to the short-circuit current signal in the first comparison unit and the fixed voltage signal, the second comparison unit compares the second voltage signal output by the voltage regulation unit with the first voltage signal corresponding to the short-circuit current signal and then outputs the short-circuit voltage signal to realize short-circuit current detection, the voltage regulation unit is adopted to output the variable voltage signal, response can be made to instantaneous large short-circuit current and long-time small short-circuit current, and load short-circuit protection can be realized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a load short circuit current detection module according to the present invention;
FIG. 2 is a schematic circuit diagram of the load short circuit current detection module of the present invention;
FIG. 3 is a circuit diagram of another embodiment of a load short circuit current detection module according to the present invention;
fig. 4 is a block diagram of the load short-circuit current detection system of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a preferred embodiment of a load short-circuit current detection module.
A load short circuit current detection module comprises a voltage output unit 10 for outputting a fixed voltage signal; a current-voltage conversion unit 20 for converting the external short-circuit current signal into a corresponding first voltage signal; a first comparing unit 30 having input terminals connected to the current-voltage converting unit 20 and the voltage outputting unit 10, respectively; a voltage adjusting unit 40 connected to an output terminal of the first comparing unit 30; and a second comparing unit 50, the input ends of which are respectively connected with the current-voltage converting unit 20 and the voltage regulating unit 40; the first comparing unit 30 receives the fixed voltage signal and the first voltage signal, compares the fixed voltage signal and the first voltage signal, and outputs a comparison result to the voltage adjusting unit 40, the voltage adjusting unit 40 receives the comparison result and adjusts and outputs a second voltage signal, and the second comparing unit 50 receives the first voltage signal and the second voltage signal, compares the first voltage signal and the second voltage signal, and outputs a short-circuit voltage signal to achieve short-circuit current detection.
By arranging the voltage adjusting unit 40, the second voltage signal is adjusted and output according to the comparison result of the first voltage signal corresponding to the short-circuit current signal output by the first comparing unit 30 and a fixed voltage signal, the second comparing unit 50 compares the second voltage signal output by the voltage adjusting unit 40 with the first voltage signal corresponding to the short-circuit current signal and outputs the short-circuit voltage signal to realize the detection of the short-circuit current, the voltage adjusting unit 40 is adopted to output a variable voltage signal, the transient large short-circuit current and the long-time small short-circuit current can be responded, the transient large short-circuit current and the long-time small short-circuit current are responded, and the transient large short-circuit current and the long-time small short-circuit current are responded, so that the load short-circuit protection is realized.
The voltage output unit 10 outputs a constant dc voltage signal, that is, a fixed voltage signal, and when a first voltage signal corresponding to the external short-circuit current signal is smaller than the dc voltage signal, the first comparing unit 30 outputs the constant dc voltage signal; when the first voltage signal corresponding to the external short-circuit current signal is greater than the dc voltage signal, the first comparing unit 30 outputs a gradually decreasing voltage signal; or, when the first voltage signal corresponding to the external short-circuit current signal is greater than the dc voltage signal, the first comparing unit 30 outputs a constant dc voltage signal; when the voltage signal corresponding to the external short-circuit current signal is smaller than the dc voltage signal, the first comparing unit 30 outputs a gradually increasing voltage signal.
And the second comparing unit 50 outputs a short-circuit voltage signal, and the external control unit controls to close the corresponding circuit switch after receiving the short-circuit voltage signal, so as to protect the circuit.
And the current-voltage converting unit 20 converts the external short-circuit current signal into a corresponding first voltage signal, where the first voltage signal is a voltage signal corresponding to the current signal amplified by the short-circuit current signal, the current signal amplified by the short-circuit current signal is in direct proportion to the actual short-circuit current, and when the short-circuit current increases, the amplified current signal also increases.
Further, the load short-circuit current detection module further includes a latch unit 60 connected to the first comparison unit 30 and/or the second comparison unit 50, and the latch unit 60 continuously transmits the short-circuit voltage signal output by the second comparison unit 50 to the input terminal of the first comparison unit 30 and/or the second comparison unit 50 to enable the second comparison unit 50 to continuously output the short-circuit voltage signal.
After the external control unit controls to close the corresponding circuit switch, the external short-circuit current signal disappears, the corresponding first voltage signal is close to zero volt, the latch unit 60 is arranged to isolate the first voltage signal from the input signal of the first comparison unit 30 and/or the second comparison unit 50, block the transmission of the first voltage signal close to zero volt to the first comparison unit 30 and/or the second comparison unit 50, and continuously transmit the short-circuit voltage signal output by the second comparison unit 50 to the first comparison unit 30 and/or the second comparison unit 50, so as to realize the locking of the short-circuit voltage signal, so that the second comparison unit 50 continuously outputs the short-circuit voltage signal and transmits the short-circuit voltage signal to the external control unit, and the corresponding circuit switch is continuously closed, so that the load short-circuit current detection module is more stable.
The latch unit 60 isolates the first voltage signal close to zero volts from the input signal of the first comparing unit 30, or isolates the first voltage signal close to zero volts from the input signal of the second comparing unit 50, so that the second comparing unit 50 can continuously output the short-circuit voltage signal. In this embodiment, the latch unit 60 is preferably configured to be connected to the input terminals of the first comparing unit 30 and the second comparing unit 50, lock the first comparing unit 30 and the second comparing unit 50, and continuously transmit the short-circuit voltage signal output by the second comparing unit 50 to the input terminals of the first comparing unit 30 and the second comparing unit 50.
In this embodiment, the latch unit 60 includes an isolating unit 61 and a locking unit 62, the isolating unit 61 isolates the first voltage signal from being transmitted to the first comparing unit 30 and/or the second comparing unit 50 after the external short-circuit current signal disappears, and the locking unit 62 continuously transmits the short-circuit voltage signal output by the second comparing unit 50 to the input terminal of the first comparing unit 30 and/or the input terminal of the second comparing unit 50. The isolation unit 61 and the locking unit 62 cooperate to isolate and block the first voltage signal corresponding to the short-circuit current signal from being transmitted to the first comparing unit 30 and the second comparing unit 50, and lock the first comparing unit 30 and the second comparing unit 50, so that the second comparing unit 50 continuously outputs the short-circuit voltage signal to protect the circuit.
Referring to fig. 2, the present invention provides an embodiment of a load short-circuit current detection module.
In this embodiment, the isolation unit 61 includes a first resistor R1, one end of the first resistor R1 is connected to the current-voltage conversion unit 20, the other end is connected to the input terminal of the first comparison unit 30, the input terminal of the second comparison unit 50, and one end of the locking unit 62, and the other end of the locking unit 62 is connected to the output terminal of the second comparison unit 50. The first resistor R1 isolates the first voltage signal output by the current-voltage conversion from the input signals of the first comparing unit 30 and the second comparing unit 50, and locks the first comparing unit 30 and the second comparing unit 50 in cooperation with the locking unit 62, so that the second comparing unit 50 continuously outputs the short-circuit voltage signal. Of course, in other embodiments, the isolation unit 61 may also use other components capable of blocking the transmission of the first voltage signal close to zero volts to the first comparison unit 30 and the second comparison unit 50.
Further, the locking unit 62 includes at least one diode D1 and a second resistor R2, an anode of the diode D1 is connected to the output terminal of the second comparing unit 50, a cathode of the diode D1 is connected to the input terminal of the second comparing unit 50 and the input terminal of the first comparing unit 30, one end of the second resistor R2 is connected to the anode of the diode D1 and the output terminal of the second comparing unit 50, and the other end of the second resistor R2 is connected to the power supply. By utilizing the unidirectional conduction characteristic of the diode D1, the short-circuit voltage signal output by the second comparing unit 50 is continuously fed back and transmitted to the input ends of the first comparing unit 30 and the second comparing unit 50, and the circuit structure is simple.
Of course, in other embodiments, the latch unit 62 may also be implemented by other circuits, for example, referring to fig. 3, the latch unit 62 includes a resistor R7, a diode D1, a transistor Q1, a resistor R8, and a resistor R9. The cathode of the diode D1 is connected to the input terminal of the second comparing unit 50 through a resistor R7, the anode is connected to the collector of the transistor Q1, one end of the resistor R8 is connected to the base of the transistor Q1, the other end of the resistor R8 is connected to the output terminal of the second comparing unit 50, one end of the resistor R9 is connected to the base of the transistor Q1, and the other end of the resistor R9 is connected to the emitter of the transistor Q1 and is connected to the power supply.
The locking unit 62 is implemented by using the circuit shown in fig. 3, and correspondingly, the second comparing unit 50 includes a second comparator U2, a positive input terminal of the second comparator U2 is connected to the voltage adjusting unit 40, and a negative input terminal is connected to the resistor R7 and connected to the isolating unit 61.
Further, the first comparing unit 30 includes a first comparator U1, a positive input terminal of the first comparator U1 is connected to the voltage outputting unit 10, a negative input terminal of the first comparator U1 is connected to the current-to-voltage converting unit 20, and an output terminal of the first comparator U1 is connected to an input terminal of the voltage adjusting unit 40. The first comparator U1 receives the first voltage signal output by the current-voltage conversion unit 20 and the fixed voltage signal output by the voltage output unit 10, compares the first voltage signal with the fixed voltage signal, and outputs the result. It is preferable that the first comparing unit 30 includes a first comparator U1, and an engineer can set a circuit structure of the first comparing unit 30 according to actual design requirements, for example, referring to fig. 3, the first comparing unit 30 further includes a capacitor C2 and a capacitor C3, one end of the capacitor C2 is connected to the positive input terminal of the first comparator U1, the other end of the capacitor C3583 is grounded, one end of the capacitor C3 is connected to the negative input terminal of the first comparator U1, and the other end of the capacitor C3 is grounded.
Further, referring to fig. 2, the second comparing unit 50 includes a second comparator U2, a positive input terminal of the second comparator U2 is connected to the current-voltage converting unit 20, and a negative input terminal is connected to the output terminal of the voltage adjusting unit 40. The second comparator U2 receives the first voltage signal output by the current-voltage conversion unit 20 and the second voltage signal output by the voltage adjustment unit 40, compares the first voltage signal and the second voltage signal, and outputs a short-circuit voltage signal.
Wherein, the power supply is a constant dc voltage signal VDD, and when the first voltage signal corresponding to the short-circuit current signal is smaller than the gradually decreasing voltage signal output by the voltage adjusting unit 40, the second comparing unit 50 outputs a zero-volt voltage; when the first voltage signal corresponding to the short-circuit current signal is greater than the gradually decreasing voltage signal output by the voltage adjusting unit 40, the second comparing unit 50 outputs a voltage equal to the constant dc voltage signal VDD minus the voltage of the second resistor R2, which is the short-circuit voltage signal.
Further, the voltage output unit 10 includes a third resistor R3 and a fourth resistor R4, the input end of the first comparing unit 30 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to the power supply, and the other end of the fourth resistor R4 is grounded.
The power supply is also a constant dc voltage signal VDD, the dc voltage signal output by the voltage output unit 10 is obtained by dividing the constant dc voltage signal VDD by the third resistor R3 and the fourth resistor R4, and the voltage output unit 10 outputs the constant dc voltage signal to the positive input terminal of the first comparing unit 30.
In this embodiment, the voltage adjustment unit 40 includes a fifth resistor R5, a sixth resistor R6, and a capacitor C1, one end of the fifth resistor R5 is connected to the output end of the first comparison unit 30, the other ends of the fifth resistor R5 are respectively connected to one ends of a sixth resistor R6 and one end of a capacitor C1, the other end of the sixth resistor R6 is connected to the power supply, and the other end of the capacitor C1 is grounded. Of course, the circuit structure of the voltage adjusting unit 40 may be designed according to an actual circuit. The circuit structure of the voltage adjusting unit 40 in this embodiment is simple, and the entire circuit structure is simplified.
When the first voltage signal corresponding to the external short-circuit current signal is smaller than the output signal of the voltage output unit 10, the output end of the first comparing unit 30 is in a high impedance state, and the voltage regulating unit 40 outputs the constant dc voltage signal VDD; when the first voltage signal corresponding to the external short-circuit current signal is greater than the output signal of the voltage output unit 10, the first comparing unit 30 outputs a zero-volt voltage, and the voltage signal output by the voltage adjusting unit 40 gradually drops from the constant dc voltage signal VDD to another constant voltage signal that is equal to the divided value of the fifth resistor R5 and the sixth resistor R6 with respect to the constant dc voltage signal VDD.
And the negative input end of the second comparing unit 50 is connected with one end of the sixth resistor R6, the fifth resistor R5 and the capacitor C1.
As shown in fig. 4, the present invention provides a preferred embodiment of a load short circuit current detection system.
A load short-circuit current detection system comprises the load short-circuit current detection module and a short-circuit current signal output end 70 connected with a current-voltage conversion unit 20 of the load short-circuit current detection module, wherein the current-voltage conversion unit 20 converts a short-circuit current signal output by the short-circuit current signal output end 70 into a corresponding first voltage signal and transmits the first voltage signal to an input end of a first comparison unit 30 and an input end of a second comparison unit 50.
The load short-circuit current detection system adjusts and outputs a second voltage signal according to a comparison result of a first voltage signal corresponding to a short-circuit current signal output by the first comparison unit 30 and a fixed voltage signal by arranging the voltage adjustment unit 40, the second comparison unit 50 compares the second voltage signal output by the voltage adjustment unit 40 with the first voltage signal corresponding to the short-circuit current signal and outputs a short-circuit voltage signal to realize short-circuit current detection, the voltage adjustment unit 40 is adopted to output a variable voltage signal, response can be made to instantaneous large short-circuit current and long-time small short-circuit current, response can be both carried out to instantaneous large short-circuit current and long-time small short-circuit current, and load short-circuit protection is realized.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and all such modifications and alterations are intended to fall within the scope of the appended claims.
Claims (9)
1. A load short circuit current detection module, comprising:
the voltage output unit is used for outputting a fixed voltage signal;
the current-voltage conversion unit is used for converting the external short-circuit current signal into a corresponding first voltage signal;
the input end of the first comparison unit is respectively connected with the current-voltage conversion unit and the voltage output unit;
the voltage regulating unit is connected with the output end of the first comparing unit; and
the input end of the second comparison unit is respectively connected with the current-voltage conversion unit and the voltage regulation unit; wherein the content of the first and second substances,
the first comparison unit receives a fixed voltage signal and a first voltage signal, compares the fixed voltage signal and the first voltage signal and outputs a comparison result to the voltage regulation unit, the voltage regulation unit receives the comparison result and regulates and outputs a second voltage signal, and the second comparison unit receives the first voltage signal and the second voltage signal and compares the first voltage signal and the second voltage signal and outputs a short-circuit voltage signal to realize short-circuit current detection;
the voltage regulating unit comprises a fifth resistor, a sixth resistor and a capacitor, one end of the fifth resistor is connected with the output end of the first comparing unit, the other end of the fifth resistor is connected with one end of the sixth resistor and one end of the capacitor respectively, the other end of the sixth resistor is connected with the power supply, and the other end of the capacitor is grounded.
2. The load short-circuit current detection module according to claim 1, further comprising a latch unit connected to the first comparison unit and/or the second comparison unit, wherein the latch unit continuously transmits the short-circuit voltage signal output by the second comparison unit to the input terminal of the first comparison unit and/or the second comparison unit to enable the second comparison unit to continuously output the short-circuit voltage signal.
3. The load short-circuit current detection module according to claim 2, wherein the latch unit comprises an isolation unit and a locking unit, the isolation unit isolates the first voltage signal from being transmitted to the first comparison unit and/or the second comparison unit after the external short-circuit current signal disappears, and the locking unit continuously transmits the short-circuit voltage signal output by the second comparison unit to the input terminal of the first comparison unit and/or the input terminal of the second comparison unit.
4. The load short-circuit current detection module according to claim 3, wherein the isolation unit comprises a first resistor, one end of the first resistor is connected to the current-voltage conversion unit, the other end of the first resistor is connected to the input terminal of the first comparison unit, the input terminal of the second comparison unit, and one end of the locking unit, and the other end of the locking unit is connected to the output terminal of the second comparison unit.
5. The load short-circuit current detection module according to claim 3, wherein the locking unit comprises at least a diode and a second resistor, an anode of the diode is connected to the output terminal of the second comparing unit, a cathode of the diode is connected to the input terminal of the second comparing unit and the input terminal of the first comparing unit, one end of the second resistor is connected to the anode of the diode and the output terminal of the second comparing unit, and the other end of the second resistor is connected to the power supply.
6. The load short-circuit current detection module according to claim 1, wherein the first comparing unit comprises a first comparator, a positive input terminal of the first comparator is connected to the voltage output unit, a negative input terminal of the first comparator is connected to the current-voltage converting unit, and an output terminal of the first comparator is connected to the input terminal of the voltage regulating unit.
7. The load short-circuit current detection module according to claim 1, wherein the second comparing unit comprises a second comparator, a positive input terminal of the second comparator is connected to the current-voltage converting unit, and a negative input terminal of the second comparator is connected to the output terminal of the voltage adjusting unit.
8. The load short-circuit current detection module according to claim 1, wherein the voltage output unit comprises a third resistor and a fourth resistor, the input end of the first comparison unit is connected to one end of the third resistor and one end of the fourth resistor respectively, the other end of the third resistor is connected to the power supply, and the other end of the fourth resistor is grounded.
9. A load short-circuit current detection system, comprising the load short-circuit current detection module as claimed in any one of claims 1 to 8, and a short-circuit current signal output terminal connected to a current-voltage conversion unit of the load short-circuit current detection module, wherein the current-voltage conversion unit converts the short-circuit current signal output by the short-circuit current signal output terminal into a corresponding first voltage signal and transmits the first voltage signal to an input terminal of the first comparison unit and an input terminal of the second comparison unit.
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| CN101150254A (en) * | 2006-09-19 | 2008-03-26 | 中兴通讯股份有限公司 | A dual-feedback short circuit protection device |
| CN101963629A (en) * | 2009-07-24 | 2011-02-02 | 瑞萨电子(中国)有限公司 | Current detection device and method |
| JP5823549B2 (en) * | 2014-02-26 | 2015-11-25 | 日置電機株式会社 | measuring device |
| CN204331523U (en) * | 2014-11-10 | 2015-05-13 | 东莞启益电器机械有限公司 | Voltage-regulating circuit |
| CN107529240B (en) * | 2016-06-22 | 2024-03-15 | 赛尔富电子有限公司 | Power supply circuit applied to LED lamp |
| CN106209041B (en) * | 2016-09-14 | 2023-05-30 | 四川易冲科技有限公司 | Overcurrent protection circuit |
| CN107886883B (en) * | 2017-12-05 | 2021-04-30 | Tcl华星光电技术有限公司 | Circuit and method for detecting common electrode wiring short circuit |
| CN207717849U (en) * | 2018-01-09 | 2018-08-10 | 深圳市四方电气技术有限公司 | Short-circuit protection measuring circuit and frequency converter |
| CN209117786U (en) * | 2018-09-27 | 2019-07-16 | 宁波兴为汽车电子有限公司 | A kind of short-circuit detecting circuit of inductive load |
| CN110265966B (en) * | 2019-07-15 | 2024-03-12 | 深圳市图灵科创产业发展有限公司 | Overload and short-circuit protection circuit |
| CN110474289A (en) * | 2019-08-20 | 2019-11-19 | 惠州汇能精电科技有限公司 | A kind of load short-circuit protection circuit |
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Address after: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee after: Shenzhen Shuorixin Energy Technology Co.,Ltd. Address before: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee before: SHENZHEN SHUORI NEW ENERGY TECHNOLOGY Co.,Ltd. |
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