CN111446903B - Power supply method and device for power module, power module and electronic equipment - Google Patents
Power supply method and device for power module, power module and electronic equipment Download PDFInfo
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- CN111446903B CN111446903B CN202010243294.6A CN202010243294A CN111446903B CN 111446903 B CN111446903 B CN 111446903B CN 202010243294 A CN202010243294 A CN 202010243294A CN 111446903 B CN111446903 B CN 111446903B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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Abstract
The invention discloses a power supply method of a power module, a power supply device, the power module and electronic equipment, wherein the power supply method of the power module comprises the steps of detecting the temperature of the power module to obtain the temperature; and determining that the first electric signal is larger than a first threshold value, and controlling a first power supply loop of a high-voltage integrated circuit in the power module to be temporarily switched off. When the temperature of the power module is overhigh, the first power supply loop of the high-voltage integrated circuit is controlled to be turned off briefly, so that the rapid increase of leakage current is limited, and meanwhile, the formation of a leakage current path is limited. The limitation of the adverse factor of the leakage current is beneficial to the stable operation of the power module.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a power supply method and device for a power module, the power module and electronic equipment.
Background
The power module is used for realizing the continuous adjustment of the rotating speed of the motor and is a core component of the refrigeration household appliance. The power module is packaged with semiconductor devices such as an IGBT (insulated gate bipolar transistor), an FRD (fast recovery diode), and an HVIC (high voltage integrated circuit). When the power module is operated, if the temperature is too high, the leakage current is rapidly increased or a leakage current path is formed, which may affect the service life and performance of the power module.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power supply method, a power supply device, a power module and an electronic device of the power module, which can limit rapid increase of leakage current at high temperature or inhibit formation of a leakage current path.
According to a first aspect embodiment of the present invention, a power supply method for a power module including a high voltage integrated circuit includes:
detecting a temperature of the power module;
and determining that the temperature is greater than a first threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be turned off at intervals.
The power supply method of the power module according to the embodiment of the invention at least has the following beneficial effects: and when the temperature of the power module is detected to be greater than a first threshold value, controlling a first power supply loop of the high-voltage integrated circuit to be switched off at intervals, so as to supply power to the high-voltage integrated circuit at intervals. The first threshold does not reach the turn-off temperature of the power module. In this case, with the power supply method of the present embodiment, the power supply of the high-voltage integrated circuit is turned off at intervals, and the high-voltage integrated circuit stops operating due to the loss of power supply for the turn-off duration of the interval turn-off, so that heat generation thereof is reduced, thereby suppressing or reducing an increase in leakage current.
According to some embodiments of the invention, the power module comprises a power conversion circuit; the power conversion circuit comprises a switching tube;
the turn-off duration of the interval turn-off is less than the signal holding duration of the control end of the switch tube.
According to some embodiments of the invention, further comprising: determining that the temperature is greater than a second threshold value, and controlling the first power supply loop to be switched off; the second threshold is greater than the first threshold.
According to some embodiments of the invention, the interval of a first temperature is turned off for a period of time greater than the interval of a second temperature, the first temperature being greater than the second temperature.
According to some embodiments of the invention, further comprising: and determining that the temperature is less than or equal to a first threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be conducted.
According to a second aspect embodiment of the present invention, a power supply device for a power module, the power module including a high voltage integrated circuit, includes:
the temperature detection circuit is used for detecting the temperature of the power module;
the control circuit is connected with the temperature detection circuit and outputs a control signal according to the temperature;
the first power supply loop is used for supplying power to the high-voltage integrated circuit; the first power supply loop comprises a power supply switch for controlling the on-off of the first power supply loop, and the power supply switch is connected with the control circuit and is switched on or switched off according to the control signal; when the power supply switch is switched on, the first power supply loop is switched on to supply power to the high-voltage integrated circuit, and when the power supply switch is switched off, the first power supply loop is switched off to stop supplying power to the high-voltage integrated circuit;
the control circuit determines that the temperature is greater than a first threshold value and outputs an interval shutdown signal as a control signal.
The power supply device of the power module according to the embodiment of the invention has at least the following beneficial effects: after the power module starts to work, if the temperature detection circuit detects that the temperature of the power module is higher than a first threshold value, an interval turn-off signal is output as a control signal to control the power supply switch to be turned off at intervals, so that the first power supply loop is turned off at intervals, and the interval turn-off of power supply of the high-voltage integrated circuit is realized. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is reduced, and the increase of the leakage current can be limited or the leakage current can be reduced.
According to some embodiments of the invention, the power module comprises a power conversion circuit comprising a switching tube; the turn-off duration of the interval turn-off signal is less than the signal holding duration of the control end of the switch tube.
According to some embodiments of the invention, the control circuit is further configured to determine that the temperature is greater than a second threshold, and output a shutdown signal as the control signal; the second threshold is greater than the first threshold.
According to some embodiments of the invention, the interval of a first temperature is turned off for a period of time greater than the interval of a second temperature, the first temperature being greater than the second temperature.
According to some embodiments of the invention, the temperature detection circuit comprises a thermistor and a voltage dividing resistor; the thermistor and the divider resistor are connected in series in a second power supply loop.
According to some embodiments of the present invention, the power supply device further comprises an analog-to-digital conversion circuit connected to the temperature detection circuit for converting an output signal of the temperature detection circuit into a digital signal.
According to some embodiments of the invention, the control circuit further comprises a gating circuit, a delay recovery circuit, a turn-off circuit and a logic gate circuit;
the gating circuit is connected with the analog-to-digital conversion circuit, and the turn-off circuit is connected with the analog-to-digital conversion circuit; the gating circuit, the delay circuit and the delay recovery circuit are connected in sequence; the turn-off circuit is connected with one input end of the logic gate circuit, and the delay recovery circuit is connected with the other input end of the logic gate circuit;
the delay circuit comprises at least one delay submodule, and the delay submodule is used for setting the turn-off duration of the interval turn-off signal;
the gating circuit is used for selectively conducting one of the at least one delay submodule according to the digital signal;
the delay recovery circuit is used for shaping an output signal of the delay circuit and outputting the interval turn-off signal;
the turn-off circuit is used for outputting a second turn-off signal according to the digital signal;
and the logic gate circuit outputs the control signal according to the second turn-off signal and the interval turn-off signal.
According to some embodiments of the invention, the control circuit is further configured to determine that the temperature is equal to or less than a first threshold value, and output a turn-on signal as the control signal.
A power module according to an embodiment of the third aspect of the present invention includes a high-voltage integrated circuit and a power conversion circuit, the high-voltage integrated circuit is configured to drive the power conversion circuit, and the power module further includes the above-mentioned power supply device, and the power supply device supplies power to the high-voltage integrated circuit.
The power module according to the embodiment of the invention has at least the following beneficial effects:
after the power module starts to work, if the temperature detection circuit in the power supply device in the power module detects that the temperature of the power module is higher than a first threshold value, an interval turn-off signal is output as a control signal to control the power supply switch to be turned off at intervals, so that the first power supply loop is turned off at intervals, and the interval turn-off of the power supply of the high-voltage integrated circuit is realized. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is reduced, and the increase of the leakage current can be limited or the leakage current can be reduced.
An electronic device according to a fourth aspect embodiment of the present invention includes the power module described above.
According to the electronic equipment provided by the embodiment of the invention, at least the following beneficial effects are achieved:
after a power module in the electronic device starts to work, if a temperature detection circuit in a power supply device in the power module detects that the temperature of the power module is higher than a first threshold value, an interval turn-off signal is output as a control signal to control a power supply switch to be turned off at intervals, so that a first power supply loop is turned off at intervals, and the interval turn-off of a power supply of a high-voltage integrated circuit is realized. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is reduced, and the increase of the leakage current can be limited or the leakage current can be reduced.
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
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a prior art power module;
fig. 2 is a flowchart of a power supply method of a power module according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a power supply apparatus of a power module according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an interval turn-off signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power supply apparatus of a power module according to an embodiment of the invention;
FIG. 6 is a diagram of input/output driving signals of a high voltage integrated circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an input/output driving signal of an alternate-off signal, high-voltage integrated circuit according to an embodiment of the invention;
FIG. 8 is a schematic circuit diagram of a temperature detection circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a control circuit and a first power supply circuit according to an embodiment of the 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 or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, a power module 100 in the prior art includes a High Voltage Integrated Circuit (HVIC) and a power conversion circuit, and the power conversion circuit includes 3 arms composed of 6 switching tubes 121 and 126. A High Voltage Integrated Circuit (HVIC) is used to drive the power conversion circuit. Specifically, the method comprises the following steps: the VCC terminal of the high-voltage integrated circuit 101 serves as the positive terminal VDD of the low-voltage power supply of the intelligent power module 100, and VDD is typically 15V or 20V.
The HIN1-3 end of the high-voltage integrated circuit 101 is respectively used as the input ends UHIN, VHIN and WHIN of the U, V, W-phase upper bridge arm of the power module 100; the LIN1-3 terminal of the high-voltage integrated circuit 101 is respectively used as the U, V, W phase lower bridge arm input terminals ULIN, VLIN, WLIN of the power module 100.
Here, the U, V, W three-phase six-way input of the power module 100 receives 0-5V input signals.
The GND terminal of the high-voltage integrated circuit 101 is used as the negative terminal COM of the low-voltage power supply of the power module 100;
a VB1 end of the high-voltage integrated circuit 101 is used as a U-phase high-voltage area power supply positive end UVB of the power module 100;
the HO1 end of the high-voltage integrated circuit 101 is connected with the grid electrode of the U-phase upper bridge arm IGBT tube 121;
the VS1 end of the high-voltage integrated circuit 101 is connected with the emitter of the IGBT tube 121, the anode of the FRD (fast recovery diode) tube 111, the collector of the U-phase lower arm IGBT tube 124, and the cathode of the FRD tube 114, and serves as the negative end UVS of the U-phase high-voltage region power supply of the power module 100;
the VB2 end of the high-voltage integrated circuit 101 is used as a power supply positive end VVB of a U-phase high-voltage area power supply of the power module 100;
the HO3 end of the high-voltage integrated circuit 101 is connected with the grid of the V-phase upper bridge arm IGBT tube 123;
the VS2 end of the high-voltage integrated circuit 101 is connected with the emitter of the IGBT tube 122, the anode of the FRD tube 112, the collector of the V-phase lower bridge arm IGBT tube 125 and the cathode of the FRD tube 115, and serves as the W-phase high-voltage area power supply negative end VVS of the power module 100;
the VB3 end of the high-voltage integrated circuit 101 is used as a W-phase high-voltage area power supply positive end WVB of the power module 100; the HO3 end of the high-voltage integrated circuit 101 is connected with the grid of the W-phase upper bridge arm IGBT tube 123;
the VS3 end of the high-voltage integrated circuit 101 is connected with the emitter of the IGBT tube 123, the anode of the FRD tube 113, the collector of the W-phase lower bridge arm IGBT tube 126 and the cathode of the FRD tube 116, and serves as the W-phase high-voltage area power supply negative end WVS of the power module 100;
the LO1-03 ends of the high-voltage integrated circuit 101 are respectively connected with the gates of the IGBT tubes 124 and 126;
the emitter of the IGBT tube 124 is connected to the anode of the FRD tube 114, and serves as a U-phase low-voltage reference end UN of the power module 100; the emitter of the IGBT tube 125 is connected to the anode of the FRD tube 115, and serves as a V-phase low-voltage reference terminal VN of the power module 100; the emitter of the IGBT tube 126 is connected to the anode of the FRD tube 116, and serves as a W-phase low-voltage reference terminal WN of the power module 100;
the collector of the IGBT tube 121, the cathode of the FRD tube 111, the collector of the IGBT tube 122, the cathode of the FRD tube 112, the collector of the IGBT tube 123, and the cathode of the FRD tube 113 are connected to each other, and serve as a high voltage input terminal P of the power module 100, where P is generally connected to 300V.
The high voltage integrated circuit 101 functions as: and respectively transmitting the 0-5V logic signals of input terminals HIN1, HIN2, HIN3, LIN1, LIN2 and LIN3 to output terminals HO1, HO2, HO3, LO1, LO2 and LO3, wherein HO1, HO2 and HO3 are logic signals of VS-VS +15V, and LO1, LO2 and LO3 are logic signals of 0-15V.
The power module used by household appliances generally requires 600V withstand voltage, namely, the leakage current is still kept low below 600V. Therefore, a voltage-resistant ring is arranged on a high-voltage integrated circuit of the power module to ensure that the part of the high-voltage integrated circuit bearing high voltage is not broken down. In order to meet the requirement of voltage resistance, a part of the area of devices such as HVIC in the power module is used on the voltage-resistant ring, and the part of the area does not participate in electric conduction, so that the improvement of the power density of the device is not favorable.
In the working process of the power module, the leakage current is very small at normal temperature, and the device is not easy to break down. Along with the increase of the working temperature, a leakage current path is formed at the edge of a voltage-resistant ring of the device, once the path is formed, the leakage current of the device grows exponentially, and at this time, the device is easy to break down. The design of the pressure ring is therefore directed to high temperature operating conditions in practice. If the leakage current of the device at high temperature can be reduced, the design of the pressure ring can be simplified, and the reliable work of the power module is not influenced, and meanwhile, the excessive layout area is not required to be occupied.
It should be emphasized that fig. 1 only illustrates the structure of one power module in the prior art, and the power module to which the present invention is directed is not limited to the specific structure in fig. 1, for example, the structure of the power conversion circuit may be a multi-level structure, or the switching tube may be other semiconductor switches such as IGCT, etc.
Referring to fig. 2, a power supply method provided by an embodiment of the present invention includes, but is not limited to, the following steps:
and step 210, determining that the temperature is greater than a first threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be turned off at intervals.
After the power module starts to work, if the temperature of the power module is detected to be higher than a first threshold value, such as 80 ℃, the first power supply loop of the high-voltage integrated circuit is controlled to be turned off at intervals, and intermittent power supply to the high-voltage integrated circuit is achieved. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is greatly reduced, and the leakage current can be reduced. The first threshold does not reach a limit temperature of the power module, e.g., a turn-off temperature of the power module. In this case, by the power supply method of this embodiment, an interval power supply mode is provided, and a leakage current path of a voltage ring on the high-voltage integrated circuit can be cut off, so that the leakage current does not continuously and rapidly increase in a high-temperature state, and the risk of high-voltage breakdown of the high-voltage integrated circuit is reduced. The setting of the first threshold may be designed according to a specific application environment, and is not limited in this embodiment. On the basis, the design simplification of the pressure ring can be realized, and the reliable work of the power module is not influenced, and meanwhile, the occupied layout area is not needed.
In some embodiments, the time interval of the turn-off is less than the signal holding time of the control end of the switch tube of the power conversion circuit.
The switching tube in the power conversion circuit continuously switches its on-off state according to the control signal, for example, the switching tube in the power conversion circuit in fig. 1 is a semiconductor switching tube IGBT. For the semiconductor switch tube, the on-off of the semiconductor switch tube is controlled by the driving signal of the control end, however, due to the influence of parasitic capacitance and the like, even if the control end stops receiving the driving signal, the signal of the control end has a short holding time, namely the signal holding time of the control end of the semiconductor switch tube. That is, in the signal holding period, the semiconductor switch tube will be ignored when the drive signal disappears briefly, and the previous state is maintained. Therefore, the time length of the interval turn-off is set to be less than the signal holding time length, so that although the power supply of the high-voltage integrated circuit is cut off in the time length of the interval turn-off, the high-voltage integrated circuit stops outputting the driving signal to the switch tube in the power conversion circuit, and the normal on-off operation of the switch tube cannot be influenced. The interval duration may be set to less than 1 microsecond, for example. The specific time setting is not limited here, and may be set according to the parameters of the semiconductor switch tube.
Referring to fig. 2, in some embodiments, the provided power supply method further includes the steps of:
and step 220, determining that the temperature of the power module is greater than a second threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be switched off.
Wherein the second threshold is greater than the first threshold.
If the temperature of the power module further rises until the temperature of the power module is larger than the second threshold, the high-voltage integrated circuit and other modules in the power module are easy to generate faults, and at the moment, the first power supply loop of the high-voltage integrated circuit is controlled to be completely turned off, namely, the first power supply loop is continuously turned off. That is, the power supply to the high-voltage integrated circuit is stopped, thereby enhancing the protection of the high-voltage integrated circuit.
In this case, the power supply of the whole power module can be cut off, so that all devices in the power module can be protected.
In some embodiments, the provided power supply method further comprises:
the duration of the high temperature turn-off intervals is greater than the duration of the low temperature turn-off intervals.
The higher the temperature, the faster the leakage current increases, and therefore the longer the off time to cut off the leakage current path. Therefore, the turn-off duration of the interval turn-off in the high-temperature state is set to be longer than the turn-off duration of the interval turn-off in the low-temperature state, and the factors of reducing the leakage current and keeping the working stability of the power module are considered.
The relationship between the off time and the temperature can be set in any manner. For example, it may be continuous, and the off-time period may also continuously change with the temperature value. The temperature can also be segmented, for example, when the temperature is 95-100 ℃, the turn-off duration of the turn-off interval is set to be t 1; when the temperature is between 90 and 95 ℃, the corresponding set interval turn-off time length is t 2; when the temperature is between 80 and 90 ℃, the corresponding set interval turn-off time length is t 3; t1> t2> t 3. The above-described manner is not limited in this embodiment.
Referring to fig. 2, in some embodiments, the provided power supply method further includes the steps of:
and step 230, determining that the temperature is less than or equal to the first threshold, and controlling the first power supply loop of the high-voltage integrated circuit to be conducted.
When the temperature of the power module is less than or equal to the first threshold, the power module is in a working state at normal temperature, and the surge of leakage current cannot be caused, so that the first power supply loop of the high-voltage integrated circuit is controlled to be conducted, the power is normally and continuously supplied to the high-voltage integrated circuit, and the working reliability of the power module is improved.
Referring to fig. 3-4, in yet another embodiment, the present invention provides a power supply apparatus of a power module, the power module including a high voltage integrated circuit 330, the power supply apparatus including:
the temperature detection circuit 300, the temperature detection circuit 300 detects the temperature of the power module;
a control circuit 310, wherein the control circuit 310 is connected with the temperature detection circuit 300 and outputs a control signal according to the temperature;
a first power supply loop for supplying power to the high voltage integrated circuit 330; the first power supply loop comprises a power supply switch 320 for controlling the on-off of the first power supply loop, and the power supply switch 320 is connected with the control circuit 310 and is switched on or switched off according to a control signal; when the power supply switch 320 is turned on, the first power supply loop is turned on to supply power to the high-voltage integrated circuit 330, and when the power supply switch is turned off, the first power supply loop is turned off to stop supplying power to the high-voltage integrated circuit 330;
when the control circuit 310 determines that the temperature is greater than the first threshold, the interval shutdown signal 340 is output as the control signal.
As shown in fig. 3, the first power supply loop includes a power supply PVCC, a power supply switch 320, and a ground terminal PGND. The above elements are connected in series to supply power to the high voltage integrated circuit 330 connected in series. After the power module starts to operate, if the temperature detection circuit 300 detects that the temperature of the power module is higher than a first threshold, for example, 80 ℃, an interval shutdown signal 340 shown in fig. 4 is output as a control signal. Toff in fig. 4 is the off duration of the interval off signal. The power supply switch 300 is controlled by the control signal to be turned off at intervals, so that the first power supply loop is turned off at intervals, and the power supply of the high-voltage integrated circuit is turned off ceaselessly and temporarily. The power supply is turned off, so that heat generation of the high voltage integrated circuit 330 is greatly reduced, and thus leakage current can be reduced. The short turn-off can cut off a leakage current path of a voltage-withstanding ring on the high-voltage integrated circuit, so that the leakage current cannot be continuously and rapidly increased in a high-temperature state, and the risk of high-voltage breakdown of the high-voltage integrated circuit 340 is reduced. The setting of the first threshold may be designed according to a specific application environment, and is not limited in this embodiment. The power supply switch 320 in fig. 3 is a MOS transistor, and similarly, the type of the power supply switch 330 is not limited, and may be a P-type or N-type, MOS transistor or other semiconductor switch, and those skilled in the art can flexibly select the power supply switch according to the actual application and the control requirement.
The control circuit 310 is implemented by an analog circuit, a digital circuit, or any other implementation manner, which is not limited in this embodiment, and any implementation form capable of implementing the functions of the control circuit is within the scope of this embodiment.
It should be noted that both the temperature detection circuit 300 and the control circuit 310 require an operating power supply, which is not explicitly shown in fig. 3, and the operating power supply is not limited in this embodiment.
In yet another embodiment, the operating power sources for temperature sensing circuit 300, control circuit 310, and high voltage integrated circuit 330 are all from the low voltage region power supply that is connected to the power input of the power module. Inside the power module, the low-voltage power supply is divided into two paths, one path is connected to the power supply PVCC of the first power supply loop, the other path is used for supplying power to the temperature detection circuit 300 and the control circuit 310, and is connected to the power supply terminal VCC of the temperature detection circuit 320 and the control circuit 310, as shown in fig. 5. The voltage of VCC, PVCC is typically 15V or 20V.
In another embodiment, the power module includes a power conversion circuit, and the off duration of the interval off signal output by the control circuit 310 in the power supply device is less than the signal holding duration of the control terminal of the switching tube of the power conversion circuit.
The high voltage integrated circuit 330 is used for driving the power conversion circuit, for example, the high voltage integrated circuit 330 converts a 0-5V driving signal received by an input terminal into a 0-15V driving signal for driving a switching tube in the power conversion circuit. When the temperature of the power module is normal, the power supply switch 320 is in a conducting state, the high-voltage integrated circuit 330 obtains continuous power supply, and as shown in fig. 6, the high-voltage integrated circuit inputs a driving signal 331, outputs a driving signal 332, and the pulse width and the timing of the output driving signal 332 and the pulse width and the timing of the input driving signal 331 are consistent. If the temperature of the power module is too high, the power switch 320 performs an on-off operation according to the interval shutdown signal 340, and the power supply timing of the high voltage integrated circuit 330 is consistent with the timing of the interval shutdown signal 340. Referring to fig. 7, the output driving signal 333 of the high voltage integrated circuit 330 has a pulse with a high level region that is one more low level segment equal to toff than the input driving signal 331.
The semiconductor switch tube in the power conversion circuit receives the driving signal to switch the on-off state. For the semiconductor switch tube, the on-off of the semiconductor switch tube is controlled by the driving signal of the control end, however, due to the influence of parasitic capacitance and the like, even if the control end stops receiving the driving signal, the signal of the control end of the semiconductor switch tube still has a short holding time, namely the signal holding time of the control end of the semiconductor switch tube. That is, in the signal holding period, the semiconductor switching element is ignored when the drive signal disappears, and the previous state is continuously held. Therefore, setting the duration of toff to be less than the signal holding duration of the control terminal of the semiconductor switch tube does not affect the on-off of the semiconductor switch tube. The interval duration may be set to less than 1 microsecond, for example. The specific time setting is not limited here, and may be set according to the parameters of the semiconductor switch tube. Therefore, the interval turn-off duration is set to be less than the signal holding duration, and although the power supply of the high-voltage integrated circuit is cut off within the interval turn-off duration toff, the high-voltage integrated circuit stops outputting the driving signal to the switching tube in the power conversion circuit, and the normal on-off operation of the switching tube is not influenced.
In another embodiment, the control circuit is further configured to determine that the temperature of the power module is greater than a second threshold, and output a shutdown signal as the control signal; wherein the second threshold is greater than the first threshold.
And if the temperature of the power module further rises until the temperature is greater than the second threshold, which is easy to cause the fault of the modules such as the high-voltage integrated circuit 330 in the power module, controlling the first power supply loop of the high-voltage integrated circuit 330 to be completely turned off. I.e., continuously shut down, the power to the high voltage integrated circuit 340 is stopped, thereby enhancing the protection of the high voltage integrated circuit 330.
In yet another embodiment, the off duration toff of interval off signal 340 is greater at high temperatures than at low temperatures.
The higher the temperature, the faster the leakage current increases and the longer the off-time required to cut off the leakage current path. Therefore, the turn-off duration of the interval turn-off in the high-temperature state is set to be longer than the turn-off duration of the interval turn-off in the low-temperature state, and the factors of reducing the leakage current and keeping the working stability of the power module are considered.
The relationship between the off-time toff and the temperature can be set in any manner. For example, it may be continuous, and the off-time toff also continuously changes with the temperature value as the temperature changes. It can also be segmented, for example, when the temperature is 95-100 ℃, the turn-off duration toff corresponding to the setting interval turn-off is t 1; when the temperature is between 90 and 95 ℃, the corresponding off-time toff of the interval off is set to be t 2; when the temperature is between 80 and 90 ℃, the corresponding off-time toff of the interval off is set to be t 3; t1> t2> t 3. The above-described manner is not limited in this embodiment.
In yet another embodiment, the temperature detection circuit 300 includes a second power supply loop including a thermistor and a voltage divider resistor connected in series. Referring to fig. 8, an example is given. The power supply VCC, the divider resistor 301, the thermistor 302 and the GND are connected in series to form a second power supply loop. It is understood that the power source VCC and the power source PVCC in the first power supply loop may both be from a power source connected to the power input of the power module. The resistance of the thermistor 302 changes following the temperature sensed by the thermistor, thereby causing a change in voltage at the connection point of the thermistor 302 and the voltage dividing resistor 301. Thereby characterizing the temperature of the power module it senses in terms of the voltage value at that connection point.
It can be understood that the series connection order of the thermistor 302 and the voltage dividing resistor 301 in the second power supply loop can be changed, that is, the series connection order of the power source VCC, the thermistor 302 and the voltage dividing resistor 301 can be changed. Similarly, the type of the thermistor is not limited, and the thermistor may be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor. Different series sequences, different thermistor types, all affect the relationship between the voltage Vout output by the junction and the temperature of the power module. For example, Vout increases with increasing temperature, or Vout decreases with increasing temperature. In this embodiment, the series connection order, the type of the thermistor, and the relationship between the output voltage Vout of the connection point and the temperature are not limited, and any combination may be used. In addition, the voltage dividing resistor 301 may include a plurality of resistors, and the plurality of resistors may be connected in series to one side of the thermistor, or a part of the plurality of resistors may be connected in series to one side of the thermistor, and another part of the plurality of resistors may be connected in series to the other side of the thermistor. Simple and effective temperature detection is realized through the arrangement.
In addition, the thermistor 302 can be disposed close to the high voltage integrated circuit 330, which can sense the temperature at or near the high voltage integrated circuit 330 more accurately and quickly.
In another embodiment, the power supply device further includes an analog-to-digital conversion circuit, a connection node is disposed between the thermistor and the voltage dividing resistor, the analog-to-digital conversion circuit is connected to the connection node, and an output terminal of the analog-to-digital conversion circuit is connected to an input terminal of the control circuit 310.
Through the arrangement of the analog-to-digital conversion circuit, the voltage value Vout at the connection point can be converted into a digital signal, for example, 000, 001, 010 … …, so that the subsequent control circuit 310 can analyze and decide the signal to output a control signal. The number of bits of the digital signal is not limited herein, and can be flexibly set by those skilled in the art.
In yet another embodiment, as shown in fig. 9, the control circuit 310 further includes a gating circuit 311, a delay circuit 312, a delay recovery circuit 313, a shutdown circuit 315, and a logic gate circuit 316;
the gating circuit 311 is connected with the analog-to-digital conversion circuit, and the turn-off circuit 315 is connected with the analog-to-digital conversion circuit; the gating circuit 311, the delay circuit 312 and the delay recovery circuit 313 are connected in sequence; the turn-off circuit 315 is connected to one input terminal of the logic gate circuit 316, and the delay recovery circuit 313 is connected to the other input terminal of the logic gate circuit 316;
the delay circuit 312 includes at least one delay submodule 314, and the delay submodule 314 is configured to set an off duration of the interval off signal;
the gating circuit 311 is used for selectively turning on one of the at least one delay submodule 314 according to the digital signal;
the delay recovery circuit 313 is configured to shape the output signal of the delay circuit 312 and output an interval shutdown signal 340;
the shutdown circuit 315 is configured to output a second shutdown signal according to the digital signal;
the logic gate circuit 316 outputs a control signal according to the second off signal and the interval off signal.
In this embodiment, the gating circuit 311 may be a logic circuit that turns on the corresponding delay sub-module 314 according to the digital signal indicative of the temperature. The delay recovery circuit 313 shapes the output signal of the delay circuit 312 and outputs the shaped signal to the power supply switch. Therefore, the effect of setting different turn-off time durations at different temperatures is realized, and the circuit is simple in structure and easy to realize.
In fig. 9, further details are given, such as the delay submodule is composed of an RC delay circuit. The RC delay circuit can be designed to stop for different times at 80 ℃ through various R, C values, for example, the RC delay circuit stops for 100ns, R is 100k omega, and C is 1 PF; stop at 100 ℃ for 300ns, R300 k Ω, C1 PF … …. When the temperature is detected to be overhigh, the power supply switch is stopped, and after the selected turn-off duration is delayed, the power supply switch is turned on; the temperature is again sensed, and when still too high, the power switch is stopped, and after a selected off duration is delayed, the power switch is turned on … … until dynamic equilibrium is reached and the temperature does not rise any more.
In fig. 9, the power switch 320 is a PMOS transistor, and the logic gate 316 is an and gate. The above setting is an illustration, and those skilled in the art can flexibly select the type of the corresponding device according to the control logic of the control circuit. In another embodiment, the control circuit 310 is further configured to determine that the temperature is less than or equal to the first threshold, and output the on signal as the control signal.
When the temperature of the power module is less than or equal to the first threshold, the power module is in a working state at normal temperature, and the surge of leakage current cannot be caused, so that the first power supply loop of the high-voltage integrated circuit is controlled to be conducted, the power is normally and continuously supplied to the high-voltage integrated circuit, and the working reliability of the power module is improved.
It is to be understood that the specific structure of the control circuit described above is merely an example, and is not to be construed as a limitation of the present invention.
In another embodiment of the present invention, a power module is further provided, which includes a high voltage integrated circuit 330 and a power conversion circuit, where the high voltage integrated circuit 330 is used for driving the power conversion circuit; the power module further comprises the above power supply device, and the power supply device supplies power to the high-voltage integrated circuit 330.
After the power module starts to work, if the temperature detection circuit in the power supply device in the power module detects that the temperature of the power module is higher than a first threshold value, an interval turn-off signal is output as a control signal to control the power supply switch to be turned off at intervals, so that the first power supply loop is turned off at intervals, and the interval turn-off of the power supply of the high-voltage integrated circuit is realized. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is reduced, and the increase of the leakage current can be limited or the leakage current can be reduced.
An electronic device according to a fourth aspect embodiment of the present invention includes the power module described above. The electronic device includes a home device.
After a power module in the electronic device starts to work, if a temperature detection circuit in a power supply device in the power module detects that the temperature of the power module is higher than a first threshold value, an interval turn-off signal is output as a control signal to control a power supply switch to be turned off at intervals, so that a first power supply loop is turned off at intervals, and the interval turn-off of a power supply of a high-voltage integrated circuit is realized. The power supply is turned off, so that the heat generation of the high-voltage integrated circuit is reduced, and the increase of the leakage current can be limited or the leakage current can be reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (13)
1. A method of powering a power module, the power module including a high voltage integrated circuit, the method comprising:
detecting a temperature of the power module;
determining that the temperature is greater than a first threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be turned off at intervals;
the power module comprises a power conversion circuit; the high-voltage integrated circuit is connected with the power conversion circuit, and the power conversion circuit comprises a switching tube;
the turn-off duration of the interval turn-off is less than the signal holding duration of the control end of the switch tube.
2. The method of supplying power of claim 1, further comprising:
determining that the temperature is greater than a second threshold value, and controlling the first power supply loop to be switched off; the second threshold is greater than the first threshold.
3. The power supply method according to claim 1,
the turn-off duration of the interval turn-off at a first temperature is greater than the turn-off duration of the interval turn-off at a second temperature, and the first temperature is greater than the second temperature.
4. The power supply method according to any one of claims 1 to 3,
and determining that the temperature is less than or equal to a first threshold value, and controlling a first power supply loop of the high-voltage integrated circuit to be conducted.
5. A power supply device for a power module, the power module including a high voltage integrated circuit, the power supply device comprising:
the temperature detection circuit is used for detecting the temperature of the power module;
the control circuit is connected with the temperature detection circuit and outputs a control signal according to the temperature;
the first power supply loop is used for supplying power to the high-voltage integrated circuit; the first power supply loop comprises a power supply switch for controlling the on-off of the first power supply loop, and the power supply switch is connected with the control circuit and is switched on or switched off according to the control signal; when the power supply switch is switched on, the first power supply loop is switched on to supply power to the high-voltage integrated circuit, and when the power supply switch is switched off, the first power supply loop is switched off to stop supplying power to the high-voltage integrated circuit;
the control circuit determines that the temperature is greater than a first threshold value and outputs an interval turn-off signal as a control signal;
the power module comprises a power conversion circuit, the high-voltage integrated circuit is connected with the power conversion circuit, and the power conversion circuit comprises a switching tube;
the turn-off duration of the interval turn-off signal is less than the signal holding duration of the control end of the switch tube.
6. The power supply device according to claim 5,
the control circuit is further configured to determine that the temperature is greater than a second threshold value, and output a first turn-off signal as the control signal; the second threshold is greater than the first threshold.
7. The power supply device according to claim 5,
the turn-off duration of the interval turn-off at a first temperature is greater than the turn-off duration of the interval turn-off at a second temperature, and the first temperature is greater than the second temperature.
8. The power supply device according to claim 5,
the temperature detection circuit comprises a second power supply loop, and the second power supply loop comprises a thermistor and a divider resistor which are connected in series.
9. The power supply device according to any one of claims 5 to 8,
the power supply device further comprises an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit is connected with the temperature detection circuit and is used for converting an output signal of the temperature detection circuit into a digital signal.
10. The power supply device according to claim 9,
the control circuit also comprises a gating circuit, a delay recovery circuit, a turn-off circuit and a logic gate circuit;
the gating circuit is connected with the analog-to-digital conversion circuit, and the turn-off circuit is connected with the analog-to-digital conversion circuit; the gating circuit, the delay circuit and the delay recovery circuit are connected in sequence; the turn-off circuit is connected with one input end of the logic gate circuit, and the delay recovery circuit is connected with the other input end of the logic gate circuit;
the delay circuit comprises at least one delay submodule, and the delay submodule is used for setting the turn-off duration of the interval turn-off signal;
the gating circuit is used for selectively conducting one of the at least one delay submodule according to the digital signal;
the delay recovery circuit is used for shaping an output signal of the delay circuit and outputting the interval turn-off signal;
the turn-off circuit is used for outputting a second turn-off signal according to the digital signal;
and the logic gate circuit outputs the control signal according to the second turn-off signal and the interval turn-off signal.
11. The power supply device according to any one of claims 5 to 8 and 10,
the control circuit is further configured to determine that the temperature is less than or equal to a first threshold value, and output a turn-on signal as the control signal.
12. A power module comprising a high voltage integrated circuit and a power conversion circuit, the high voltage integrated circuit being for driving the power conversion circuit,
the power module further comprises a power supply device according to any one of claims 5 to 11, which supplies the high voltage integrated circuit with power.
13. An electronic device, characterized in that the electronic device comprises a power module according to claim 12.
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| CN202010243294.6A CN111446903B (en) | 2020-03-31 | 2020-03-31 | Power supply method and device for power module, power module and electronic equipment |
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| JP5660358B2 (en) * | 2009-09-25 | 2015-01-28 | 株式会社オートネットワーク技術研究所 | Power supply control device |
| CN102045014A (en) * | 2010-11-29 | 2011-05-04 | 辽宁工业大学 | Brushless DC motor controller for four-wheel independently driven electric automobile and control method thereof |
| CN103490681B (en) * | 2012-06-12 | 2016-08-03 | 上海金脉电子科技有限公司 | Control the method and system of attached brushless DC motor of electric vehicle |
| CN103072125B (en) * | 2013-01-14 | 2015-07-01 | 南京久驰机电实业有限公司 | Brake control method of electric tool |
| CN104852356B (en) * | 2014-02-17 | 2018-09-21 | 伊顿公司 | The control protective unit of motor |
| CN206313694U (en) * | 2016-12-23 | 2017-07-07 | 广东高标电子科技有限公司 | Power device control and overheat protector system for electric machine controller |
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Effective date of registration: 20240528 Address after: 400064 plant 1, No. 70, Meijia Road, Nan'an District, Chongqing Patentee after: Meiken Semiconductor Technology Co.,Ltd. Country or region after: China Address before: 056107 No.99, Meide Road, Handan Development Zone, Handan City, Hebei Province Patentee before: HANDAN MIDEA REFRIGERATION EQUIPMENT Co.,Ltd. Country or region before: China Patentee before: GD MIDEA AIR-CONDITIONING EQUIPMENT Co.,Ltd. |