CN218850383U - Compressor system and low-voltage isolation protection circuit, vehicle - Google Patents
Compressor system and low-voltage isolation protection circuit, vehicle Download PDFInfo
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Abstract
The utility model discloses a compressor system and low voltage isolation protection circuit, vehicle, wherein, the compressor system includes that high pressure is regional and low pressure is regional, and low voltage isolation protection circuit includes: the device comprises a voltage detection unit, an overvoltage detection unit, an undervoltage detection unit, an isolation unit and a control unit, wherein the voltage detection unit, the overvoltage detection unit and the undervoltage detection unit are arranged in a low-voltage area; the overvoltage detection unit outputs an overvoltage detection signal according to the voltage detection value; the undervoltage detection unit outputs an undervoltage detection signal according to the voltage detection value; the isolation communication unit carries out isolation transmission on the overvoltage detection signal and the undervoltage detection signal; and the control unit determines whether the low-voltage power supply has an overvoltage phenomenon or an undervoltage phenomenon according to the overvoltage detection signal and the undervoltage detection signal and controls the starting of the protection function of the compressor system. The circuit realizes the detection of whether the low-voltage power supply is in overvoltage or undervoltage through the overvoltage detection unit and the undervoltage detection unit.
Description
Technical Field
The application relates to the technical field of compressors, in particular to a compressor system, a low-voltage isolation protection circuit and a vehicle.
Background
An air conditioner compressor of an electric vehicle simultaneously utilizes a high-voltage direct-current power supply and a low-voltage direct-current power supply on the electric vehicle to supply power, the high-voltage direct-current power supply is used as energy input required by the compressor, and the low-voltage direct-current power supply is used as energy input required by communication and control.
However, the microcontroller of the compressor system generally does not collect and determine the voltage of the low-voltage dc power supply, and thus cannot perform protection or fault feedback when the voltage of the low-voltage dc power supply is abnormal (e.g., overvoltage or undervoltage). For example, in a 12V low voltage system, the operating voltage is 9 to 16V, and when the low voltage power supply is under-voltage, i.e., the voltage of the low voltage power supply is reduced to below 8V, the compressor may not recognize the under-voltage and continue to operate, which may affect the service life of the compressor system.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses a first aim at provides a low-voltage isolation protection circuit of compressor system, through set up excessive pressure detecting element and under-voltage detecting element in low-voltage region, has realized detecting whether excessive pressure or under-voltage phenomenon of low-voltage power supply to the protect function that can control compressor system in time starts, has improved compressor system's life.
A second object of the present invention is to provide a compressor system.
A third object of the present invention is to provide a vehicle.
In order to achieve the above object, according to the utility model discloses a low-voltage isolation protection circuit of compressor system is proposed to the embodiment of the first aspect, and compressor system includes that high-pressure region is regional and low-pressure region, and low-voltage isolation protection circuit includes: the voltage detection unit is arranged in a low-voltage area, is connected with a low-voltage power supply of the compressor system and outputs a voltage detection value by detecting the power supply voltage of the low-voltage power supply; the overvoltage detection unit is arranged in the low-voltage area and is connected with the voltage detection unit so as to output an overvoltage detection signal according to a voltage detection value; the undervoltage detection unit is arranged in the low-voltage area and is connected with the voltage detection unit so as to output an undervoltage detection signal according to the voltage detection value; the isolation communication unit is used for carrying out isolation transmission on the overvoltage detection signal and the undervoltage detection signal; the control unit is arranged in the high-voltage area and connected with the isolation communication unit, and the control unit controls the starting of the protection function of the compressor system when determining that the overvoltage phenomenon or the undervoltage phenomenon occurs in the low-voltage power supply according to the overvoltage detection signal and the undervoltage detection signal.
According to the utility model discloses compressor system's low-voltage isolation protection circuit, through set up voltage detection unit in the low pressure region, overvoltage detection unit and under-voltage detection unit, and set up the control unit in the high pressure region, and carry out signal isolation transmission through keeping apart communication unit between low pressure region and the high pressure region, detect the supply voltage of low voltage power supply through voltage detection unit like this, with the output voltage detection value, overvoltage detection unit exports overvoltage detection signal according to voltage detection value, under-voltage detection unit exports under-voltage detection signal according to voltage detection value, keep apart communication unit and keep apart the transmission to overvoltage detection signal and under-voltage detection signal, control unit can confirm that low voltage power supply appears overvoltage phenomenon or under-voltage phenomenon according to overvoltage detection signal and under-voltage detection signal that the protect function of control compressor system starts, thereby realized whether there is overvoltage or under-voltage phenomenon in detecting the low voltage power supply, and when confirming that overvoltage phenomenon or under-voltage phenomenon appears in the low voltage power supply, control compressor system's protect function in time starts, ensure compressor safe and reliable operation, the life of compressor system has been improved.
According to the utility model discloses an embodiment, excessive pressure detecting element includes: the first voltage division circuit is used for dividing a preset reference voltage and outputting a first reference divided voltage value; and a first input end of the first comparator is connected with the output end of the first voltage division circuit, and a second input end of the first comparator is connected with the output end of the voltage detection unit and used for comparing a voltage detection value with a first reference voltage division value and outputting an overvoltage detection signal.
According to the utility model discloses an embodiment, the undervoltage detection unit includes: the second voltage division circuit is used for dividing the preset reference voltage and outputting a second reference voltage division value; and a first input end of the second comparator is connected with the output end of the second voltage division circuit, and a second input end of the second comparator is connected with the output end of the voltage detection unit and used for comparing the voltage detection value with a second reference voltage division value and outputting an under-voltage detection signal.
According to an embodiment of the present invention, the first input terminal of the first comparator is a positive input terminal, and the first input terminal of the second comparator is a negative input terminal.
According to the utility model discloses an embodiment, the first input of first comparator is the negative input, and the first input of second comparator is the negative input.
According to the utility model discloses an embodiment, low-voltage insulation protection circuit still includes: and the first input end of the AND gate unit is connected with the output end of the first comparator, the second input end of the AND gate unit is connected with the output end of the second comparator, and the output end of the AND gate unit is connected with the input end of the isolation communication unit.
According to the utility model discloses an embodiment, voltage detection unit includes: one end of the first resistor is connected to a low-voltage power supply; and one end of the second resistor is connected with the other end of the first resistor and is provided with a first node, and the other end of the second resistor is grounded, wherein the first node is used as the output end of the voltage detection unit.
According to the utility model discloses an embodiment, keep apart the communication unit and include optoelectronic coupler, optoelectronic coupler's light emitting device is located low pressure region, and optoelectronic coupler's photic device is located high pressure region.
To achieve the above object, according to a second aspect of the present invention, a compressor system is provided, including: a compressor; the inverter is connected with the compressor to drive the compressor to operate; the low-voltage isolation protection circuit according to any one of the embodiments is used for protecting the compressor by controlling the inverter when the low-voltage power supply generates an overvoltage phenomenon or an undervoltage phenomenon.
According to the utility model discloses compressor system through adopting foretell low voltage isolation protection circuit, can realize whether there is excessive pressure or under-voltage phenomenon to the low voltage power supply and effectively detect to when excessive pressure phenomenon or under-voltage phenomenon appear in the definite low voltage power supply, in time start compressor system's protect function ensures compressor safe and reliable operation, has improved compressor system's life.
To achieve the above object, according to a third aspect of the present invention, a vehicle is provided, including the compressor system according to the foregoing description.
According to the utility model discloses the vehicle through adopting foretell compressor system, can realize whether there is excessive pressure or under-voltage phenomenon to the low voltage power supply effectively to detect when excessive pressure phenomenon or under-voltage phenomenon appear confirming the low voltage power supply, in time start compressor system's protect function ensures the operation of compressor safe and reliable, has improved compressor system's life.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a system schematic of a compressor system according to an embodiment of the present invention;
fig. 2 is a system schematic of a low voltage isolation protection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a low voltage isolation protection circuit according to a first embodiment of the present invention;
fig. 4 is a circuit diagram of a low voltage isolation protection circuit according to a second embodiment of the present invention;
fig. 5 is a circuit diagram of a low voltage isolation protection circuit including an and gate unit according to a first embodiment of the present invention;
fig. 6 is a circuit diagram of a low voltage isolation protection circuit including an and gate unit according to a second embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
The compressor system, the low voltage isolation protection circuit and the vehicle according to the embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a system schematic of a compressor system according to an embodiment of the present invention. As shown in fig. 1, the compressor system includes an inverter 11, a compressor 12, a control unit 13, a rectifying unit 14, an isolation communication unit 30, a transformer, a voltage detection unit 21, an overvoltage detection unit 22, an undervoltage detection unit 23, and a switching unit 25. The system comprises an inverter 11, a compressor 12, a control unit 13, a secondary side T2 of a transformer and a rectification unit 14, wherein the secondary side T2 and the rectification unit 14 are arranged in a high-voltage area 10 of the compressor system, and a voltage detection unit 21, an overvoltage detection unit 22, an undervoltage detection unit 23, a primary side T1 of the transformer and a switch unit 25 are arranged in a low-voltage area 20 of the compressor system.
The DC side of the inverter 11 is connected to a high voltage power supply DC, the ac side of the inverter 11 is connected to the windings of the compressor 12,the windings of the compressor 12 may be connected in a star connection, and the control unit 13 may control the inverter 11 to drive the compressor 12 to operate. Both ends of the voltage detection unit 21 and the low voltage power supply V SUP Connected to both ends of primary side T1 of transformer and low-voltage power supply V SUP The two ends of the secondary side T2 of the transformer are connected to the control unit 13 and the rectifying unit 14, respectively, to supply power to the control unit 13.
As shown in fig. 1 and 2, the low voltage isolation protection circuit 100 includes: the system comprises a voltage detection unit 21 arranged in a low-voltage area 20, an overvoltage detection unit 22 arranged in the low-voltage area 20, an undervoltage detection unit 23 arranged in the low-voltage area 20, an isolation communication unit 30 and a control unit 13 arranged in the high-voltage area 10.
Wherein, the voltage detection unit 21 and the low voltage power supply V of the compressor system SUP Connected by detecting low voltage source V SUP To output a voltage detection value; the overvoltage detection unit 22 is connected with the voltage detection unit 21 to output an overvoltage detection signal So according to the voltage detection value; the undervoltage detection unit 23 is connected with the voltage detection unit 21 to output an undervoltage detection signal Su according to the voltage detection value; the isolation communication unit 30 is used for performing isolation transmission on the overvoltage detection signal So and the undervoltage detection signal Su; the control unit 13 is connected to the isolation communication unit 30, and the control unit 13 determines the low-voltage power supply V according to the overvoltage detection signal So and the undervoltage detection signal Su SUP And controlling the starting of the protection function of the compressor system when the over-pressure phenomenon or the under-pressure phenomenon occurs.
Specifically, the voltage detection unit 21 inputs the voltage detection value to the overvoltage detection unit 22 and the undervoltage detection unit 23, the overvoltage detection unit 22 and the undervoltage detection unit 23 detect the voltage detection value, output the overvoltage detection signal So and the undervoltage detection signal Su, transmit the overvoltage detection signal So and the undervoltage detection signal Su to the control unit 13 through the isolation communication unit 30, and after receiving the overvoltage detection signal So and the undervoltage detection signal Su, the control unit 13 determines the low-voltage power supply V according to the overvoltage detection signal So and the undervoltage detection signal Su SUP Whether an over-voltage phenomenon or an under-voltage phenomenon occurs, and in a low-voltage power supply V SUP And controlling the starting of the protection function of the compressor system when the over-pressure phenomenon or the under-pressure phenomenon occurs.
Taking the compressor system shown in fig. 1 as an example, the protection function of the compressor system includes controlling the inverter 11 to be turned off by the control unit 13 so that the compressor 12 stops operating and the control unit 13 gives an alarm message. It should be noted that different compressor systems have different protection functions, and the specific description is not limited herein.
In the above embodiment, the overvoltage detection unit and the undervoltage detection unit output the overvoltage detection signal and the undervoltage detection signal, and the control unit detects whether the low-voltage power supply has an overvoltage or undervoltage phenomenon according to the overvoltage detection signal and the undervoltage detection signal, so as to detect whether the low-voltage power supply has the overvoltage or undervoltage phenomenon, and when it is determined that the overvoltage or undervoltage phenomenon occurs in the low-voltage power supply, the protection function of the compressor system is controlled to be started in time, so that the safe and reliable operation of the compressor is ensured, and the service life of the compressor system is prolonged.
In some embodiments, as shown in fig. 3, the overvoltage detection unit 22 includes: a first voltage dividing circuit 220 and a first comparator OP1. Wherein the first voltage dividing circuit 220 is used for dividing the preset reference voltage V CC Dividing the voltage and outputting a first reference voltage dividing value; a first input terminal of the first comparator OP1 is connected to the output terminal of the first voltage dividing circuit 220, and a second input terminal of the first comparator OP1 is connected to the output terminal of the voltage detecting unit 21, and is configured to compare the voltage detection value with the first reference voltage dividing value, and output an overvoltage detection signal So.
In some embodiments, as shown in fig. 3, the brown-out detection unit 23 includes: a second voltage division circuit 230 and a second comparator OP2. Wherein the second voltage dividing circuit 230 is used for dividing the preset reference voltage V CC Dividing the voltage and outputting a second reference voltage dividing value; a first input terminal of the second comparator OP2 is connected to the output terminal of the second voltage dividing circuit 230, and a second input terminal of the second comparator OP2 is connected to the output terminal of the voltage detecting unit 21, and is configured to compare the voltage detection value with the second reference voltage dividing value, and output an under-voltage detection signal Su.
Specifically, a reference voltage V is preset CC For the working voltages of the first comparator OP1 and the second comparator OP2, the preset reference voltage V is coupled through the first voltage dividing circuit 220 and the second voltage dividing circuit 230 CC And performing voltage division to obtain a first reference voltage division value and a second reference voltage division value, wherein the first reference voltage division value is a voltage overvoltage value, the second reference voltage division value is a voltage undervoltage value, the first comparator OP1 and the second comparator OP2 compare the input voltage values, and an overvoltage detection signal So and an undervoltage detection signal Su are output.
When calculating the first reference voltage division value and the second reference voltage division value, if a device such as a diode or an MOS transistor exists at the front end of the low-voltage power supply circuit, the forward conduction voltage drop of the diode or the MOS transistor should be added to the first reference voltage division value and the second reference voltage division value. For example, if a diode or MOS transistor with a forward conduction voltage drop of 0.3V is present at the front end of the low-voltage power supply loop, the first reference voltage division value is changed from 16V to 16.3V, and the second reference voltage division value is changed from 8V to 8.3V.
In an optional embodiment, the low voltage isolation protection circuit further includes a voltage conversion unit for converting the low voltage power supply into a preset reference voltage. The voltage conversion unit may be a Buck circuit (Buck converter) or a LDO (Low Dropout Regulator).
In an alternative embodiment, as shown in fig. 3, the first voltage divider circuit 220 includes a third resistor R3 and a fourth resistor R4. Wherein, one end of the third resistor R3 is connected to the preset reference voltage V CC The other end of the third resistor R3 is an output end of the first voltage dividing circuit 220, and is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
The second voltage dividing circuit 230 includes a fifth resistor R5 and a sixth resistor R6. Wherein, one end of the fifth resistor R5 is connected to the preset reference voltage V CC The other end of the fifth resistor R5 is an output end of the second voltage dividing circuit 230, and is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded.
By adjusting the ratio of the third resistor R3 to the fourth resistor R4 and the ratio of the fifth resistor R5 to the sixth resistor R6, the first voltage divider circuit 220 and the second voltage divider circuit 230 will preset parametersReference voltage V CC The divided voltage is divided into a first reference divided voltage value and a second reference divided voltage value which are different.
In an optional embodiment, the overvoltage detection unit further includes a first hysteresis circuit, the undervoltage detection unit further includes a second hysteresis circuit, the first hysteresis circuit is connected in parallel between the second input terminal and the output terminal of the first comparator, the second hysteresis circuit is connected in parallel between the second input terminal and the output terminal of the second comparator, and the protection value and the recovery value of the comparator can be set to different values (for example, 17V overvoltage protection, and 16.5V normal recovery), so as to prevent frequent protection and recovery of the compressor system caused by fluctuation of the low-voltage power supply around the overvoltage/undervoltage protection value.
It should be noted that the first hysteresis circuit and the second hysteresis circuit may be any hysteresis circuit, such as resistors. The connection mode of the first hysteresis circuit and the second hysteresis circuit may also be other connection modes, and is not limited herein.
In some embodiments, as shown in fig. 3, the first input terminal of the first comparator OP1 is a positive input terminal, and the first input terminal of the second comparator OP2 is a negative input terminal.
Specifically, when the voltage detection value is smaller than the first reference divided voltage value, the overvoltage detection signal So is a high level signal, and when the voltage detection value is greater than or equal to the first reference divided voltage value, the overvoltage detection signal So is a low level signal. When the voltage detection value is less than or equal to the second reference voltage division value, the under-voltage detection signal Su is a low-level signal, and when the voltage detection value is greater than the second reference voltage division value, the under-voltage detection signal Su is a high-level signal. Then, the low-voltage power supply V is determined according to the preset relation table shown in the table 1 SUP Whether an exception exists.
TABLE 1
| Overvoltage detection signal So | Under-voltage detection signal Su | Control unit determines |
| 1 | 1 | Low voltage power supply normal |
| 1 | 0 | Low voltage power supply under-voltage |
| 0 | 1 | Overvoltage of low-voltage power supply |
| 0 | 0 | System exception |
In some embodiments, as shown in fig. 4, the first input terminal of the first comparator OP1 is a negative input terminal, and the first input terminal of the second comparator OP2 is a negative input terminal.
Specifically, when the voltage detection value is smaller than the first reference divided voltage value, the overvoltage detection signal So is a low level signal, and when the voltage detection value is greater than or equal to the first reference divided voltage value, the overvoltage detection signal So is a high level signal. When the voltage detection value is less than or equal to the second reference voltage division value, the under-voltage detection signal Su is a low-level signal, and when the voltage detection value is greater than the second reference voltage division value, the under-voltage detection signal Su is a high-level signal. Then, the low-voltage power supply V is determined according to the preset relation table shown in Table 2 SUP Whether an exception exists.
TABLE 2
| Overvoltage detection signal So | Under-voltage detection signal Su | Control unit determines |
| 1 | 1 | System exception |
| 1 | 0 | Low voltage input overvoltage |
| 0 | 1 | Low voltage input undervoltage |
| 0 | 0 | Low voltage input voltage normal |
In some embodiments, as shown in fig. 5 and 6, the low voltage isolation protection circuit 100 further includes: and an and gate unit 24, a first input terminal of the and gate unit 24 is connected to the output terminal of the first comparator OP1, a second input terminal of the and gate unit 24 is connected to the output terminal of the second comparator OP2, and an output terminal of the and gate unit 24 is connected to the input terminal of the isolated communication unit 30.
Specifically, the and gate unit 24 is added after the first comparator OP1 and the second comparator OP2, and the and gate unit 24 transmits the output result to the control unit 13 through the isolation communication unit 30, so that the use of the components of the isolation communication unit 30 can be saved, but the low-voltage power supply V cannot be distinguished SUP Whether an over-voltage or an under-voltage occurs.
For example, taking the low voltage isolation protection circuit 100 shown in fig. 5 as an example, when the voltage detection value is smaller than the first reference divided voltage value, the overvoltage detection signal So is a high level signal, and when the voltage detection value is greater than or equal to the first reference divided voltage value, the overvoltage detection signal So is a low level signal. When the voltage detection value is less than or equal to the second reference voltage division value, the under-voltage detection signal Su is a low-level signal, and when the voltage detection value is greater than the second reference voltage division value, the under-voltage detection signal Su is a high-level signal. When both the overvoltage detection signal So and the undervoltage detection signal Su are high level signals, the and gate unit 24 outputs a high level signal, and otherwise, the and gate unit 24 outputs a low level signal. Then, the low-voltage power supply V is determined according to the preset relation table shown in Table 3 SUP Whether an exception exists.
TABLE 3
In the embodiment, the AND gate unit is added after the first comparator and the second comparator, so that the use of components of the isolation communication unit is saved, and the cost of the compressor system is reduced.
In some embodiments, as shown in fig. 3, the voltage detection unit 21 includes: a first resistor R1 and a second resistor R2. Wherein, one end of the first resistor R1 is connected to the low-voltage power supply V SUP (ii) a One end of the second resistor R2 is connected to the other end of the first resistor R1 and has a first node J1, and the other end of the second resistor R2 is grounded, where the first node J1 serves as an output end of the voltage detection unit 21.
That is, the voltage detection value is the voltage across the second resistor R2, and the voltage detection value output by the voltage detection unit 21 is adjusted by adjusting the ratio of the first resistor R1 to the second resistor R2, so as to avoid the occurrence of detection result errors caused by too large or too small voltage detection values.
The value ranges of the first resistor R1 and the second resistor R2 can be calculated according to the following formula:
wherein λ represents the ratio of the first resistance R1 to the second resistance R2, U U Indicating undervoltage value, V, of the low-voltage power supply CC Represents a preset reference voltage, λ U Represents the ratio of the fifth resistor R5 to the sixth resistor R6, U o Indicating the overvoltage of the low-voltage power supply, lambda O Represents the ratio of the third resistance R3 to the fourth resistance R4, U max Representing the maximum voltage value, I, of the low-voltage power supply Qm Represents the maximum value of the quiescent current (i.e., the current of the first node J1).
From equations (1) to (4):
the value range of the ratio of the first resistor R1 to the second resistor R2 can be obtained by the formula (5), the value range of the second resistor R2 can be obtained by the formula (6), the ratio of the third resistor R3 to the fourth resistor R4 can be obtained by the formula (7), and the ratio of the fifth resistor R5 to the sixth resistor R6 can be obtained by the formula (8).
In some embodiments, the isolated communication unit 30 includes a photo coupler, a light emitting device of which is located in the low voltage region 20, and a light receiving device of which is located in the high voltage region 10.
Specifically, the light emitting device is connected to the overvoltage detection unit 22 and the undervoltage detection unit 23, and the light receiving device is connected to the control unit 13. When the overvoltage detection signal So or the undervoltage detection signal Su is a high level signal, the light emitting device is turned on, so that the light receiving device is turned on, the electrical signal output by the light receiving device is a high level signal, and when the overvoltage detection signal So or the undervoltage detection signal Su is a low level signal, the light emitting device is turned off, so that the light receiving device is turned off, the electrical signal output by the light receiving device is a low level signal, so that the transmission of the electrical signal is realized.
When the and gate unit 24 is not added behind the first comparator OP1 and the second comparator OP2, two photoelectric couplers are needed in the circuit, and one photoelectric coupler is arranged behind each of the overvoltage detection unit 22 and the undervoltage detection unit 23; when the and gate unit 24 is added after the first comparator OP1 and the second comparator OP2, only one photocoupler is needed in the circuit, and a light emitting device of the photocoupler is connected to an output terminal of the and gate unit 24.
The technical scheme of the application is further detailed by combining the specific implementation modes as follows:
taking the low-voltage isolation protection circuit 100 shown in FIG. 3 as an example, the low-voltage power supply V SUP The normal input voltage range of (1) is 9-16V, and the maximum low-voltage power supply voltage U max 24V, overvoltage protection value U o Is 16.5V and the undervoltage protection value U U 8.5V, the quiescent current I allowed by the circuit Qm The consumption does not exceed 50uA.
First according to U max And V CC Determining the ratio of R1 to R2:
λ =10 may be desirable.
According to U max And I Qm Determining the values of R1 and R2:
it may be desirable that R2=100k Ω, R 1 ＝λR 2 ＝1MΩ。
According to λ, V CC 、U U And U o Determining the ratio of R3 to R4, R5 to R6:
R1＝1MΩ，R2＝100kΩ，R3＝120kΩ，R4＝51kΩ，R5＝120kΩ，R6＝22kΩ，V CC =5V, the input voltage of the negative input terminal of the first comparator OP1 and the positive input terminal of the second comparator OP2 is: v SUP *R2/(R1+R2)＝V SUP /11, the input voltage of the positive input end of the first comparator OP1 is V CC * Ro 2/(R3 + R4) =1.49V, and the negative input terminal input voltage of the second comparator OP2 is V CC * Ru 2/(R5 + R6) =0.775V. Therefore, as shown in Table 3, when V SUP When the voltage is less than or equal to 8.52V (11 × 0.775v), the undervoltage detection signal Su is at a low level, and the control unit 13 controls the undervoltage protection function to start; when V is SUP When the voltage is more than or equal to 16.4V (11X 1.49V), the overvoltage detection signal So is at a low level, and the control unit 13 controls the overvoltage protection function to start; when 8.52V<V SUP <At 16.4V, the undervoltage detection signal Su and the overvoltage detection signal So are at high level, and the control unit 13 determines the low-voltage power supply V SUP The input voltage is normal.
TABLE 4
In the embodiment, whether the low-voltage power supply has overvoltage or undervoltage phenomenon is detected according to the overvoltage detection signal and the undervoltage detection signal output by the overvoltage detection unit and the undervoltage detection unit, so that whether the low-voltage power supply has overvoltage or undervoltage phenomenon is detected; and when the overvoltage phenomenon or the undervoltage phenomenon of the low-voltage power supply is determined, the control unit controls the protection function to be started, so that the service life of the compressor system is prolonged.
Taking the low voltage isolation protection circuit shown in fig. 5 as an example, an and gate unit 24 is added after the first comparator OP1 and the second comparator OP2. When V is shown in Table 4 SUP Less than or equal to 8.52V (11X 0.775V) or V SUP When the voltage is more than or equal to 16.4V (11 x 1.49V), the output of the AND gate unit 24 is low level, and the control unit 13 controls the protection function to start; when 8.52V<V SUP <At 16.4V, the output of the AND gate unit 24 is high level, and the control unit 13 determines the low voltage power supply V SUP The input voltage is normal.
TABLE 5
In the embodiment, the AND gate unit is added behind the overvoltage detection unit and the undervoltage detection unit, so that the use of components of the isolation communication unit is reduced, and the cost of the compressor system is reduced.
In summary, according to the low voltage isolation protection circuit of the compressor system of the embodiment of the present invention, the overvoltage detection unit and the under-voltage detection unit output the overvoltage detection signal and the under-voltage detection signal, and the control unit detects whether the low voltage power supply has the overvoltage or the under-voltage phenomenon according to the overvoltage detection signal and the under-voltage detection signal, so as to detect whether the low voltage power supply has the overvoltage or the under-voltage phenomenon; and when the control unit determines that the low-voltage power supply has an overvoltage phenomenon or an undervoltage phenomenon, the control unit controls the protection function to start, so that the service life of the compressor system is prolonged.
Corresponding to the above embodiment, the embodiment of the utility model also provides a compressor system.
As shown in fig. 1, the compressor system includes: compressor 12, inverter 11 and low voltage isolation protection circuit 100 according to any of the preceding embodiments.
The inverter 11 is connected with the compressor 12 to drive the compressor 12 to operate; low voltage isolation protection circuit 100 for use in low voltage power supply V SUP When an overvoltage phenomenon or an undervoltage phenomenon occurs, the inverter 11 is controlled to protect the compressor 12.
According to the utility model discloses compressor system through adopting foretell low-voltage isolation protection circuit, can realize whether there is excessive pressure or under-voltage phenomenon to the low-voltage power supply effectively to detect when confirming that over-voltage phenomenon or under-voltage phenomenon appear in the low-voltage power supply, in time start compressor system's protect function ensures compressor safe and reliable operation, has improved compressor system's life.
Corresponding to the above-mentioned embodiment, the embodiment of the utility model also provides a vehicle, include according to aforementioned compressor system.
According to the utility model discloses the vehicle through adopting foretell compressor system, can realize whether there is excessive pressure or under-voltage phenomenon to the low voltage power supply effectively to detect when excessive pressure phenomenon or under-voltage phenomenon appear confirming the low voltage power supply, in time start compressor system's protect function ensures the operation of compressor safe and reliable, has improved compressor system's life.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second", and the like, used in the embodiments of the present invention, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying that the technical feature quantity indicated in the embodiments is indicated. Therefore, the features of the embodiments of the present invention defined by the terms "first", "second", and the like, may explicitly or implicitly indicate that at least one of the features is included in the embodiments. In the description of the present invention, the word "plurality" means at least two or two and more, for example, two, three, four, etc., unless specifically limited otherwise in the examples.
In the present invention, unless otherwise explicitly specified or limited by the embodiments, the terms "mounted," "connected," and "fixed" appearing in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, or the like; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific implementation.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A low voltage isolation protection circuit for a compressor system, the compressor system including a high voltage region and a low voltage region, the low voltage isolation protection circuit comprising:
the voltage detection unit is arranged in the low-voltage area, is connected with a low-voltage power supply of the compressor system and outputs a voltage detection value by detecting the power supply voltage of the low-voltage power supply;
the overvoltage detection unit is arranged in the low-voltage area and is connected with the voltage detection unit so as to output an overvoltage detection signal according to the voltage detection value;
the undervoltage detection unit is arranged in the low-voltage area and is connected with the voltage detection unit so as to output an undervoltage detection signal according to the voltage detection value;
the isolation communication unit is used for carrying out isolation transmission on the overvoltage detection signal and the undervoltage detection signal;
the control unit is arranged in the high-voltage area and connected with the isolation communication unit, and the control unit controls the starting of the protection function of the compressor system when determining that the low-voltage power supply has the overvoltage phenomenon or the undervoltage phenomenon according to the overvoltage detection signal and the undervoltage detection signal.
2. The low voltage isolation protection circuit according to claim 1, wherein the overvoltage detection unit comprises:
the first voltage division circuit is used for dividing a preset reference voltage and outputting a first reference voltage division value;
and a first input end of the first comparator is connected with the output end of the first voltage division circuit, and a second input end of the first comparator is connected with the output end of the voltage detection unit, and is used for comparing the voltage detection value with the first reference voltage division value and outputting the overvoltage detection signal.
3. The low voltage isolation protection circuit of claim 2, wherein the under-voltage detection unit comprises:
the second voltage division circuit is used for dividing the preset reference voltage and outputting a second reference voltage division value;
and a second comparator, a first input end of which is connected with an output end of the second voltage division circuit, and a second input end of which is connected with an output end of the voltage detection unit, and is used for comparing the voltage detection value with the second reference voltage division value and outputting the undervoltage detection signal.
4. The LVDS protection circuit of claim 3, wherein the first input terminal of the first comparator is a positive input terminal, and the first input terminal of the second comparator is a negative input terminal.
5. The low voltage isolation protection circuit of claim 3, wherein the first input of the first comparator is a negative input and the first input of the second comparator is a negative input.
6. The low voltage isolation protection circuit according to claim 4 or 5, further comprising:
and the first input end of the AND gate unit is connected with the output end of the first comparator, the second input end of the AND gate unit is connected with the output end of the second comparator, and the output end of the AND gate unit is connected with the input end of the isolation communication unit.
7. The low voltage isolation protection circuit according to any one of claims 1 to 5, wherein the voltage detection unit comprises:
a first resistor having one end connected to the low voltage power supply;
and one end of the second resistor is connected with the other end of the first resistor and is provided with a first node, the other end of the second resistor is grounded, and the first node is used as the output end of the voltage detection unit.
8. The low voltage isolation protection circuit according to any one of claims 1 to 5, wherein the isolation communication unit includes a photo coupler, a light emitting device of the photo coupler is located in the low voltage region, and a light receiving device of the photo coupler is located in the high voltage region.
9. A compressor system, comprising:
a compressor;
the inverter is connected with the compressor to drive the compressor to operate;
the low voltage isolation protection circuit according to any one of claims 1 to 8, configured to protect the compressor by controlling the inverter when an overvoltage or an undervoltage occurs in the low voltage power supply.
10. A vehicle characterized by comprising a compressor system according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222373584.XU CN218850383U (en) | 2022-09-06 | 2022-09-06 | Compressor system and low-voltage isolation protection circuit, vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222373584.XU CN218850383U (en) | 2022-09-06 | 2022-09-06 | Compressor system and low-voltage isolation protection circuit, vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN218850383U true CN218850383U (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222373584.XU Active CN218850383U (en) | 2022-09-06 | 2022-09-06 | Compressor system and low-voltage isolation protection circuit, vehicle |
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| Country | Link |
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| CN (1) | CN218850383U (en) |
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2022
- 2022-09-06 CN CN202222373584.XU patent/CN218850383U/en active Active
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