CN217882819U - Load protection circuit and electrical equipment - Google Patents
Load protection circuit and electrical equipment Download PDFInfo
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- CN217882819U CN217882819U CN202220683509.0U CN202220683509U CN217882819U CN 217882819 U CN217882819 U CN 217882819U CN 202220683509 U CN202220683509 U CN 202220683509U CN 217882819 U CN217882819 U CN 217882819U
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Abstract
The utility model is suitable for an electronic circuit technical field provides a load protection circuit and electrical equipment, and the circuit is connected with the bus voltage end including falling the power protection module for when the bus voltage end falls the electricity last output voltage signal in the preset time: the starting control module is connected with the power-down protection module and used for entering a starting protection state after receiving the voltage signal and entering a startable state after a preset time; and the state detection module is connected with the starting control module and the main control chip and is used for detecting the state information of the started control module and outputting the state information to the main control chip so that the main control chip executes corresponding starting operation according to the state information. The application provides a load protection circuit enables loads such as compressor or fan and just can restart after the time reaches predetermineeing falling the power supply, avoids making the load life-span shorten because of the repeated start-stop of electricity on the short time outage many times, prolongs the life of load.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a load protection circuit and electrical equipment.
Background
The refrigeration electrical equipment usually realizes the refrigeration function by a refrigeration system, the core of the refrigeration system is a compressor, the compressor sucks low-temperature and low-pressure refrigerant gas from a gas suction pipe, drives a piston to compress the refrigerant gas through the operation of a motor, and discharges high-temperature and high-pressure refrigerant gas to an exhaust pipe to provide power for a refrigeration cycle, so that the refrigeration cycle of compression → condensation (heat release) → expansion → evaporation (heat absorption) is realized.
When the equipment is powered on again in a short time after power failure, for example, when the equipment is powered on again in 5 minutes after power failure, the equipment can repeatedly start the compressor, for example, the loads such as the compressor or the fan are repeatedly started in a short time after the power failure of household appliances such as a refrigerator and an air conditioner, and the loads such as the compressor or the fan are repeatedly started and stopped when the power failure of the household appliances is repeated in a short time, so that the service life of the loads is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model provides a load protection circuit aims at solving the problem that the repeated start-stop of power-on in the equipment short time leads to load life to shorten among the prior art.
The embodiment of the utility model provides a realize like this, a load protection circuit, include:
the power failure protection module is connected with the bus voltage end and used for continuously outputting a voltage signal within a preset time when the bus voltage end is powered down:
the starting control module is connected with the power-down protection module and used for entering a starting protection state after receiving the voltage signal and entering a startable state after preset time;
and the state detection module is connected with the starting control module and the main control chip and is used for detecting the state information of the started control module and outputting the state information to the main control chip so that the main control chip executes corresponding starting operation according to the state information.
Optionally, the power-down protection module includes a first resistor, a second resistor, a first diode, a first capacitor, and a second capacitor;
one end of the first resistor is connected with the bus voltage end, and the other end of the first resistor is connected with the anode of the first diode and one end of the first capacitor;
the cathode of the first diode is connected with one end of the second resistor and one end of the second capacitor, and the cathode of the first diode is also connected with the starting control module;
the other end of the first capacitor, the other end of the second resistor and the other end of the second capacitor are grounded.
Optionally, the start control module includes a first switch tube, a second diode, and a third resistor;
a first pole pin of the first switch tube is connected with the power-down protection module, a second pole pin is connected with a cathode of the second diode, and a third pole pin is connected with one end of the third resistor and the state detection module;
the anode of the second diode is connected with the bus voltage end;
the other end of the third resistor is grounded.
Optionally, the first switch tube is a P-type MOS tube.
Optionally, the state detection module comprises a fourth resistor;
one end of the fourth resistor is connected with the starting control module, and the other end of the fourth resistor is connected with an input/output pin of the main control chip.
In a second aspect, the present application further provides an electrical apparatus, including the load protection circuit as described above.
The embodiment of the utility model provides a be connected with the bus voltage end through power down protection module, thereby output voltage signal to start control module when the bus voltage end falls the electricity, start control module receives the defeated voltage signal entering start protection state of power down protection module, and start control module can get into the start-up state when not receiving power down protection module output voltage signal after the time of predetermineeing, state detection module detects start control module's state information and exports to main control chip, when starting protection state, main control chip can not start the load of equipment such as compressor or fan at once, thereby make loads such as compressor or fan can restart after the time of electricity reaches the time of predetermineeing, avoid making the load life shorten because of the repeated start-stop of electricity on the short time outage many times, the life of extension load.
Drawings
FIG. 1 is a block diagram of an embodiment of a load protection circuit of the present application;
fig. 2 is a schematic circuit diagram of an embodiment of a load protection circuit according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
This application embodiment just can restart after the power failure reaches the time of predetermineeing through making loads such as compressor or fan, avoids making the load life-span shorten because of repeated start-stop of short time outage power-on many times, prolongs the life of load.
Example one
In some alternative embodiments, as shown in fig. 1-2, the present application provides a load protection circuit comprising:
the power down protection module 100 is connected to the bus voltage terminal VCC, and is configured to continuously output a voltage signal within a preset time when the bus voltage terminal VCC is powered down:
the start control module 200 is connected with the power-down protection module 100, and is used for entering a start protection state when receiving a voltage signal and entering a startable state after a preset time;
and the state detection module 300 is connected to the start control module 200 and the main control chip U1, and is configured to detect state information of the started control module 200 and output the state information to the main control chip U1, so that the main control chip U1 executes a corresponding start operation according to the state information.
In practice, the bus voltage terminal VCC refers to a bus of a device, and in some embodiments, the device includes, but is not limited to, a device such as a refrigerator, an air conditioner, or an ice chest, and the device includes a load such as a compressor or a fan, and is not specifically limited herein. When the device is powered on, for example, when the device is connected to a mains grid, the bus voltage terminal VCC provides a voltage at which the device normally operates, and when the device is powered down, for example, when the mains is powered down or a plug of the device is unplugged, the bus voltage terminal VCC is zero.
Optionally, the power down protection module 100 is connected to the bus voltage terminal VCC, so as to obtain the bus voltage of the bus voltage terminal VCC, when the bus voltage terminal VCC fails, that is, when the bus voltage of the bus voltage terminal VCC is zero, the power down protection module 10 continuously outputs a voltage signal within a preset time, in some embodiments, the preset time is a time for starting a load when the device is powered on again after the power down, optionally, different devices are provided with corresponding preset times, which can be obtained by a device manufacturer through experimental tests, and further description is omitted again.
The start control module 200 is connected to the power down protection module 100 to enter a corresponding working state according to the voltage signal output by the power down protection module 100, optionally, when the power down protection module 100 continuously outputs the voltage signal at the bus voltage VCC for a preset time, the start control module 200 enters a start protection state, and after the preset time, the power down protection module 100 stops outputting the voltage signal, and at this time, the start control module 200 enters a startable state.
The state detection module 300 sends the detected state information of the start control module 200 to the main control chip U1, and in implementation, the main control chip U1 may be an MCU of the device, and the main control chip U1 is used to control the operation of the device, which is not described herein again. When the main control chip U1 acquires that the start control module 200 is in the start protection state, it indicates that the device power-down time does not reach the preset time, the main control chip U1 does not control the start of the loads such as the compressor or the fan, and only when the main control chip U1 acquires that the start control module 200 is in the startable state, it indicates that the device power-down time reaches the preset time, the main control chip U1 controls the start of the loads such as the compressor or the fan. For example, taking the device as an example of a refrigerator, after a power failure of the refrigerator, if the compressor is powered on again within a short time (for example, 5 minutes, 6 minutes, or 10 minutes) to start working, the life of the compressor may be shortened due to repeated start and stop of the compressor within the short time, at this time, the power down module 100 continuously outputs a voltage signal within a preset time after the power failure of the bus voltage terminal VCC, for example, the preset time is 5 minutes, if the refrigerator is powered on again within 5 minutes, the power down protection module 100 still outputs the voltage signal to the start control module 200, so that the start control module 200 is in the start protection state, the main control chip U1 determines that the device is powered on again within the short time after detecting the state information of the start control module 200 through the state detection module 300, at this time, the main control chip U1 does not power up the compressor again, and it is avoided that the load of the device is powered on again within the short time after the power failure, and the service lives of the load and the device can be effectively prolonged.
The embodiment of the utility model provides a be connected with bus voltage end VCC through power down protection module 100, thereby output voltage signal to start control module 200 when bus voltage end VCC falls the electricity, start control module 200 and receive the voltage signal that power down protection module 100 is defeated and get into the start-up protection state, and start control module 200 can get into the start-up state when not receiving power down protection module 100 output voltage signal after the time of predetermineeing, state detection module 300 detects the state information of start control module 200 and exports to main control chip U1, when starting the protection state, main control chip U1 can not start the load of equipment such as compressor or fan at once, thereby make loads such as compressor or fan can restart after the time of predetermineeing is reached in the electricity, avoid making the load life shorten because of the repeated start-up of short time outage many times, the life of extension load.
Example two
In some optional embodiments, the power down protection module 100 includes a first resistor R1, a second resistor R2, a first diode D1, a first capacitor C1, and a second capacitor C2;
one end of a first resistor R1 is connected with a bus voltage end VCC, and the other end of the first resistor R1 is connected with the anode of a first diode D1 and one end of a first capacitor C1;
the cathode of the first diode D1 is connected to one end of the second resistor R2 and one end of the second capacitor C2, and the cathode of the first diode D1 is further connected to the start control module 200;
the other end of the first capacitor C1, the other end of the second resistor R2 and the other end of the second capacitor C2 are grounded.
Optionally, the start-up control module 200 includes a first switch Q1, a second diode D2, and a third resistor R3;
a first pole pin of the first switch tube Q1 is connected to the power-down protection module 100, in implementation, the first pole pin of the first switch tube Q1 is connected to a cathode of the first diode D1, a second pole pin of the first switch tube Q1 is connected to a cathode of the second diode D2, and a third pole pin of the first switch tube Q1 is connected to one end of the third resistor R3 and the state detection module 300;
the anode of the second diode D2 is connected with a bus voltage end VCC;
the other end of the third resistor R3 is grounded.
Optionally, the state detection module 300 includes a fourth resistor R4;
one end of the fourth resistor R4 is connected to the start control module 200, and in implementation, one end of the fourth resistor R4 is connected to the third pin of the first switch Q1, and the other end of the fourth resistor R4 is connected to the input/output pin MCU _ I/0 of the main control chip U1.
Optionally, the first switch Q1 is a P-type MOS transistor, and the first pole pin, the second pole pin, and the third pole pin of the first switch Q1 are a gate, a source, and a drain of the MOS transistor, respectively.
In some optional embodiments, taking the device as a refrigerator as an example, the working principle of the load protection circuit provided by the present application is as follows:
in the normal working process of the refrigerator, the bus voltage terminal VCC has a voltage, for example, the bus voltage terminal VCC is 5V or 33V, and the voltage of the bus voltage terminal VCC may also be other values, specifically related to the device parameters, which is not specifically limited herein. The voltage of the bus voltage end VCC is supplied to the grid electrode of the first switch tube Q1, the grid electrode of the first switch tube Q1 is at a high level, the first switch tube Q1 is cut off at the moment, and the bus voltage end VCC also charges the first capacitor C1 and the second capacitor C2.
When the refrigerator is powered off, the voltage VCC at the bus voltage end is zero, at this time, the first capacitor C1 and the second capacitor C2 both discharge within a preset time through the second resistor R2, so that the gate of the first switch tube Q1 within the preset time is maintained at a high level, the first switch tube Q1 is cut off, the cut-off of the first switch tube Q1 is that the start control module 200 enters a start protection state, at this time, the input/output pin MCU _ I/0 of the main control chip U1 is at a low level, if the device is powered on again within the preset time, the input/output pin MCU _ I/0 is detected as a low level after the main control chip U1 is reset and restarted, it is determined that the device is powered on again within a short time (e.g., 5 minutes), the main control chip U1 does not start the compressor, or the main control chip U1 starts the compressor again when the time reaches the preset time. It should be noted that the discharge time of the second capacitor C2 may be controlled by setting or selecting parameters of the second capacitor C2 and the second resistor R1, which is not specifically limited herein, in this application, the high level and the low level may be set according to the conduction voltage drop of the first switch tube Q1, for example, when the source voltage of the first switch tube Q1 is fixed, when the gate voltage of the first switch tube Q1 is lower than a1, the first switch tube Q1 is conducted, the parameters of the second capacitor C2 and the second resistor R2 may be set so that the voltage is reduced to a1 after the second capacitor C2 is discharged for the preset time.
In another embodiment, when the refrigerator is powered down, the voltage VCC of the bus voltage end is zero, and at this time, the first capacitor C1 and the second capacitor C2 both discharge within a preset time through the second resistor R2, so that the gate of the first switch tube Q1 within the preset time is maintained at a high level, the first switch tube Q1 is turned off, and the input/output pin MCU _ I/0 of the main control chip U1 is at a low level. When the device is powered on again after the power-down preset time, for example, the device is powered on again after being powered off for 5 minutes, the discharge time of the first capacitor C1 and the second capacitor C2 exceeds 5 minutes, so that the voltage of the first capacitor C1 and the second capacitor C2 is lower than a1, at this time, the circuit is powered on again, the first capacitor C1 is charged again and reset to start, the first capacitor C1 is charged again, the second capacitor C2 is charged again after the charging of the first capacitor C1 is completed, so that the voltage of the second capacitor C2 is still lower than a1 after the restarting of the main control chip U1 is completed, further, the gate of the first switch tube Q1 is at a low level, so that the first switch tube Q1 is switched on, that is, the start control module 200 enters a startable state, at this time, the main control chip U1 detects that the input/output pin MCU _ I/0 is at a high level, it is determined that the device is powered on again after exceeding 5 minutes, and the main control chip U1 starts the compressor.
In a second aspect, the present application further provides an electrical apparatus including the load protection circuit as described above.
Optionally, the electrical device includes, but is not limited to, a device such as a refrigerator, an air conditioner, or an ice chest, which includes a load such as a compressor or a blower, and the load protection circuit in the electrical device includes a power down protection module 100, a start control module 200, and a status detection module 300. Wherein, power down protection module 100 is connected with busbar voltage end VCC for when busbar voltage end VCC falls the power supply, last output voltage signal in the time of predetermineeing: the start control module 200 is connected to the power-down protection module 100, and is configured to enter a start protection state when receiving a voltage signal, and enter a startable state after a preset time; the state detection module 300 is connected to the start control module 200 and the main control chip U1, and is configured to detect state information of the start control module 200 and output the state information to the main control chip U1, so that the main control chip U1 executes a corresponding start operation according to the state information.
In implementation, the bus voltage terminal VCC refers to a bus of the device, when the device is powered on, for example, when the device is connected to a mains power grid, the bus voltage terminal VCC provides a voltage for normal operation of the device, and when the device is powered down, for example, when the mains power is cut off or a plug of the device is pulled out, the bus voltage terminal VCC is powered down, and the voltage is zero.
Optionally, the power down protection module 100 is connected to the bus voltage terminal VCC, so as to obtain a bus voltage of the bus voltage terminal VCC, when the bus voltage terminal VCC is powered down, that is, when the bus voltage of the bus voltage terminal VCC is zero, the power down protection module 10 continuously outputs a voltage signal within a preset time, in some embodiments, the preset time is a time for starting a load when the device is powered up again after being powered down, optionally, different devices are provided with corresponding preset times, which can be obtained by a device manufacturer through an experimental test, and details are not repeated again.
The start control module 200 is connected to the power down protection module 100 to enter a corresponding working state according to the voltage signal output by the power down protection module 100, optionally, when the power down protection module 100 continuously outputs the voltage signal at the bus voltage VCC for a preset time, the start control module 200 enters a start protection state, and after the preset time, the power down protection module 100 stops outputting the voltage signal, and at this time, the start control module 200 enters a startable state.
The state detection module 300 sends the detected state information of the start control module 200 to the main control chip U1, and in implementation, the main control chip U1 may be an MCU of the device, and the main control chip U1 is used to control the operation of the device, which is not described herein again. When the main control chip U1 acquires that the start control module 200 is in the start protection state, it indicates that the device power-down time does not reach the preset time, the main control chip U1 does not control the start of the loads such as the compressor or the fan, and only when the main control chip U1 acquires that the start control module 200 is in the startable state, it indicates that the device power-down time reaches the preset time, the main control chip U1 controls the start of the loads such as the compressor or the fan. For example, taking the device as an example of a refrigerator, after a power failure of the refrigerator, if the compressor is powered on again within a short time (for example, 5 minutes, 6 minutes, or 10 minutes) to start working, the life of the compressor may be shortened due to repeated start and stop of the compressor within the short time, at this time, the power down module 100 continuously outputs a voltage signal within a preset time after the power failure of the bus voltage terminal VCC, for example, the preset time is 5 minutes, if the refrigerator is powered on again within 5 minutes, the power down protection module 100 still outputs the voltage signal to the start control module 200, so that the start control module 200 is in the start protection state, the main control chip U1 determines that the device is powered on again within the short time after detecting the state information of the start control module 200 through the state detection module 300, at this time, the main control chip U1 does not power up the compressor again, and it is avoided that the load of the device is powered on again within the short time after the power failure, and the service lives of the load and the device can be effectively prolonged.
The embodiment of the utility model provides a be connected with bus voltage end VCC through power down protection module 100, thereby output voltage signal to start control module 200 when bus voltage end VCC falls the electricity, start control module 200 and receive the voltage signal that power down protection module 100 is defeated and get into the start-up protection state, and start control module 200 can get into the start-up state when not receiving power down protection module 100 output voltage signal after the time of predetermineeing, state detection module 300 detects the state information of start control module 200 and exports to main control chip U1, when starting the protection state, main control chip U1 can not start the load of equipment such as compressor or fan at once, thereby make loads such as compressor or fan can restart after the time of predetermineeing is reached in the electricity, avoid making the load life shorten because of the repeated start-up of short time outage many times, the life of extension load.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A load protection circuit, comprising:
the power failure protection module is connected with the bus voltage end and used for continuously outputting a voltage signal within a preset time when the bus voltage end is powered down:
the starting control module is connected with the power-down protection module and used for entering a starting protection state after receiving the voltage signal and entering a startable state after the preset time;
and the state detection module is connected with the starting control module and the main control chip and is used for detecting the state information of the started control module and outputting the state information to the main control chip so that the main control chip executes corresponding starting operation according to the state information.
2. The load protection circuit of claim 1, wherein the power down protection module comprises a first resistor, a second resistor, a first diode, a first capacitor, and a second capacitor;
one end of the first resistor is connected with the bus voltage end, and the other end of the first resistor is connected with the anode of the first diode and one end of the first capacitor;
the cathode of the first diode is connected with one end of the second resistor and one end of the second capacitor, and the cathode of the first diode is also connected with the starting control module;
the other end of the first capacitor, the other end of the second resistor and the other end of the second capacitor are grounded.
3. The load protection circuit of claim 1, wherein the start-up control module comprises a first switch tube, a second diode, and a third resistor;
a first pole pin of the first switch tube is connected with the power-down protection module, a second pole pin of the first switch tube is connected with a cathode of the second diode, and a third pole pin of the first switch tube is connected with one end of the third resistor and the state detection module;
the anode of the second diode is connected with the bus voltage end;
the other end of the third resistor is grounded.
4. The load protection circuit of claim 3, wherein the first switching transistor is a P-type MOS transistor.
5. The load protection circuit of claim 1, wherein the state detection module comprises a fourth resistor;
one end of the fourth resistor is connected with the starting control module, and the other end of the fourth resistor is connected with an input/output pin of the main control chip.
6. An electrical apparatus, characterized in that it comprises a load protection circuit according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220683509.0U CN217882819U (en) | 2022-03-25 | 2022-03-25 | Load protection circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220683509.0U CN217882819U (en) | 2022-03-25 | 2022-03-25 | Load protection circuit and electrical equipment |
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| Publication Number | Publication Date |
|---|---|
| CN217882819U true CN217882819U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220683509.0U Active CN217882819U (en) | 2022-03-25 | 2022-03-25 | Load protection circuit and electrical equipment |
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| CN (1) | CN217882819U (en) |
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- 2022-03-25 CN CN202220683509.0U patent/CN217882819U/en active Active
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