CN107070190B - Power supply device and capacitance heating control method thereof - Google Patents
Power supply device and capacitance heating control method thereof Download PDFInfo
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- CN107070190B CN107070190B CN201710284565.0A CN201710284565A CN107070190B CN 107070190 B CN107070190 B CN 107070190B CN 201710284565 A CN201710284565 A CN 201710284565A CN 107070190 B CN107070190 B CN 107070190B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The embodiment of the invention provides a power supply device and a capacitance heating control method thereof, wherein the power supply device comprises a voltage conversion circuit and a heating control circuit; the voltage conversion circuit comprises a switching power supply circuit, a first capacitor and a second capacitor, wherein the first end of the first capacitor is electrically connected with the voltage input end of the switching power supply circuit, and the first end of the second capacitor is connected with the voltage output end of the switching power supply circuit; the heating control circuit comprises a controllable switch electrically connected between the voltage input end and the voltage output end, and is used for conducting under the driving of a preset switch control signal and forming a charge-discharge loop between the first capacitor and the second capacitor; the charge and discharge loop is used for conducting charge and discharge current and heating the second capacitor through the charge and discharge current. The embodiment of the invention can effectively prevent the influence on the normal use of the power supply device due to the reduction of the capacitance under the low-temperature condition.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply device and a capacitance heating control method thereof.
Background
In various switching power supplies, the electrolytic capacitor serving as the output filter capacitor has obvious capacity reduction at low temperature, and the capacity reduction range of partial electrolytic capacitors at low temperature exceeds 50%. The large reduction of the capacity of the output filter capacitor can cause various faults of the switching power supply, for example, the starting power supply with a large load can cause the voltage of the output filter capacitor to be unstable, so that the voltage of the output filter capacitor exceeds the voltage specification of a switching tube of the switching power supply. At present, in the application of the switching power supply, in order to prevent the problem caused by the over-low temperature, a certain heating time is generally required for the switching power supply, and the heating time is generally from several minutes to about half an hour. And when the capacity of the electrolytic capacitor reaches a required value, the load is switched on. In addition, a heater is arranged at the bottom end of the electrolytic capacitor, and when the switching power supply is turned on, the heater is controlled by the heating control circuit to heat the electrolytic capacitor, so that the capacity of the electrolytic capacitor is restored to a normal value. However, if the heater is not provided, the switching power supply heat engine usually needs a long time, and the working efficiency of the switching power supply under the low-temperature condition cannot be ensured; if the heater is provided, the production cost of the switching power supply increases.
Disclosure of Invention
The embodiment of the invention provides a power supply device and a capacitance heating control method thereof, which can realize capacitance heating of the power supply device at low temperature with low cost, thereby ensuring the working efficiency of the power supply device at low temperature.
A first aspect of embodiments of the present invention provides a power supply apparatus, including: a voltage conversion circuit and a heating control circuit;
the voltage conversion circuit comprises a switching power supply circuit, a first capacitor and a second capacitor, the switching power supply circuit comprises a voltage input end and a voltage output end, the first end of the first capacitor is electrically connected with the voltage input end, the first end of the second capacitor is connected with the voltage output end, and the second end of the first capacitor is electrically connected with the second end of the second capacitor;
the heating control circuit comprises a controllable switch, the controllable switch is electrically connected between the voltage input end and the voltage output end, the controllable switch is used for being conducted under the driving of a preset switch control signal, and a charging and discharging loop is formed between the first capacitor and the second capacitor;
the charge and discharge loop is used for conducting charge and discharge current between the first capacitor and the second capacitor and heating the second capacitor through the charge and discharge current.
The controllable switch in the heating control circuit is controlled to be switched on by the preset switch control signal, so that a charge-discharge loop is formed between the first capacitor and the second capacitor, and the charge-discharge loop can generate heat under the action of current, so that the second capacitor can be heated by the charge-discharge current between the first capacitor and the second capacitor, and the normal use of the power supply device can be effectively prevented from being influenced due to the fact that the capacity of the second capacitor is greatly reduced under the low-temperature condition, and the working efficiency of the power supply device under the low-temperature condition is guaranteed.
In an embodiment, the heating control circuit further includes a current limiting resistor, and the current limiting resistor is connected in series with the controllable switch and is configured to limit the magnitude of the charging and discharging current on the charging and discharging loop.
The current limiting resistor can prevent the damage of the controllable switch caused by overlarge charging and discharging current on the charging and discharging loop.
In an embodiment, the power supply device further includes a switch driving circuit, where the switch driving circuit is electrically connected to the control terminal of the controllable switch, and is configured to output the preset switch control signal and drive the controllable switch to be turned on or off according to the preset switch control signal.
In one embodiment, the switch driving circuit is an isolated driving circuit.
In one embodiment, the switch driving circuit includes an optical coupler and a driver, where one end of the optical coupler is electrically connected to the signal output end of the driver, and the other end of the optical coupler is electrically connected to the control end of the controllable switch, and is configured to couple a preset switch control signal output by the signal output end of the driver to the control end of the controllable switch.
The switch driving circuit is set to be an isolated driving circuit through the optical coupler, so that the switch driving circuit can be effectively prevented from generating interference on a switch power supply circuit of the power supply device, and the stability of the switch power supply circuit is ensured.
In an embodiment, the switching power supply circuit includes an energy storage inductor, a first switching tube and a second switching tube, a first end of the energy storage inductor is electrically connected to the voltage input terminal, a second end of the energy storage inductor is electrically connected to the first end of the first switching tube and the first end of the second switching tube, a second end of the first switching tube is electrically connected to the second end of the first capacitor and the second end of the second capacitor, and a second end of the second switching tube is electrically connected to the voltage output terminal.
In one embodiment, the preset switch control signal is the same as the driving signal of the first switch tube.
The preset switch control signal is set to be the same as the drive signal of the first switch tube, so that the first switch tube is conducted and is charged by the energy storage inductor, the controllable switch is controlled to be conducted to form the charging and discharging loop, the second capacitor is heated, a drive circuit is not required to be arranged on the controllable switch independently, interference of the drive circuit on the switch power supply circuit can be prevented, and the production cost of the power supply device is reduced.
In an embodiment, the power supply device further includes a capacitor capacity detection circuit electrically connected to the switch driving circuit, and the capacitor capacity detection circuit is further electrically connected to the first capacitor and the second capacitor, and is configured to detect a capacity of the second capacitor, and when the capacity of the second capacitor exceeds a preset threshold, trigger the switch driving circuit to stop working, and enable the power supply device to enter a normal working state.
In one embodiment, the capacitance and capacitance detecting circuit includes a voltage detecting circuit and a capacitance calculating circuit, the voltage detecting circuit is electrically connected to the first capacitor and the second capacitor, and configured to detect a voltage of the first capacitor during a period in which the controllable switch is turned on, and detect a voltage of the second capacitor at least twice, a time interval between two adjacent times of detecting the voltage of the second capacitor is a preset time interval, and obtain a first voltage of the second capacitor and a second voltage of the second capacitor, respectively, and the capacitance calculating circuit is configured to calculate a capacitance of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor, and the preset time interval.
In the process of heating the second capacitor, the controllable switch can be triggered to be turned off by detecting the capacity of the second capacitor when the capacity of the second capacitor exceeds a preset threshold, that is, when the capacity of the second capacitor can meet the load driving requirement of the power supply device, heating of the second capacitor is stopped, so that the power consumption of the power supply device can be effectively controlled while the capacity of the second capacitor is recovered to the required capacity.
A second aspect of an embodiment of the present invention provides a capacitance heating control method, including:
a heating control circuit is arranged between a voltage input end and a voltage output end of the voltage conversion circuit, and the heating control circuit comprises a controllable switch;
driving the controllable switch to be conducted according to a preset switch control signal, and forming a charge-discharge loop between a first capacitor and a second capacitor of the voltage conversion circuit;
and conducting charge-discharge current between the first capacitor and the second capacitor through the charge-discharge loop, and heating the second capacitor through the charge-discharge current.
The controllable switch in the heating control circuit is controlled to be switched on by the preset switch control signal, so that a charge-discharge loop is formed between the first capacitor and the second capacitor, and the charge-discharge loop can generate heat under the action of current, so that the second capacitor can be heated by the charge-discharge current between the first capacitor and the second capacitor, and the normal use of the power supply device can be effectively prevented from being influenced due to the fact that the capacity of the second capacitor is greatly reduced under the low-temperature condition, and the working efficiency of the power supply device under the low-temperature condition is guaranteed.
In one embodiment, the method further comprises: and detecting the capacity of the second capacitor, and triggering the switch driving circuit to stop working when the capacity of the second capacitor exceeds a preset threshold value, so that the power supply device enters a normal working state.
In one embodiment, the detecting the capacitance of the second capacitor includes:
detecting a voltage of the first capacitance during the conduction of the controllable switch;
detecting the voltage of the second capacitor at least twice during the conduction period of the controllable switch to obtain a first voltage of the second capacitor and a second voltage of the second capacitor respectively, wherein the time interval of detecting the voltage of the second capacitor twice is a preset time interval;
and calculating the capacity of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor and the preset time interval.
In the process of heating the second capacitor, the controllable switch can be triggered to be turned off by detecting the capacity of the second capacitor when the capacity of the second capacitor exceeds a preset threshold, that is, when the capacity of the second capacitor can meet the load driving requirement of the power supply device, heating of the second capacitor is stopped, so that the power consumption of the power supply device can be effectively controlled while the capacity of the second capacitor is recovered to the required capacity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and the description of the embodiments of the present invention will be briefly described below.
Fig. 1 is a first structural schematic diagram of a power supply apparatus provided in an embodiment of the invention;
fig. 2 is a second schematic structural diagram of a power supply device according to an embodiment of the invention;
fig. 3 is a schematic diagram of a third structure of the power supply device according to the embodiment of the invention;
FIG. 4 is a first flowchart of a capacitive heating control method according to an embodiment of the present invention;
FIG. 5 is a second flowchart of a capacitive heating control method according to an embodiment of the invention;
fig. 6 is a schematic diagram of a third flow of the capacitive heating control method according to the embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1, in an embodiment of the present invention, a power supply apparatus 100 is provided, including: a voltage conversion circuit 110, a heating control circuit 130, and a switch drive circuit 150.
The voltage conversion circuit 110 includes a switching power supply circuit 111, a first capacitor C1 and a second capacitor C2, the switching power supply circuit 111 includes a voltage input terminal In and a voltage output terminal Out, a first end of the first capacitor C1 is electrically connected to the voltage input terminal In, a first end of the second capacitor C2 is connected to the voltage output terminal Out, and a second end of the first capacitor C1 is electrically connected to a second end of the second capacitor C2.
The heating control circuit 130 includes a controllable switch K electrically connected between the voltage input terminal In and the voltage output terminal Out, the switch driving circuit 150 is electrically connected to a control terminal of the controllable switch K for outputting a preset switch control signal, and the controllable switch K is configured to be turned on under the driving of the preset switch control signal and form a charge-discharge loop between the first capacitor C1 and the second capacitor C2.
The charge and discharge loop is used for conducting charge and discharge current between the first capacitor C1 and the second capacitor C2 and heating the second capacitor C2 through the charge and discharge current.
In this embodiment, the voltage conversion circuit 110 is a Boost circuit, the first capacitor C1 is an input filter capacitor of the Boost circuit, and the second capacitor C2 is an output filter capacitor of the Boost circuit. The second capacitor C2 is an electrolytic capacitor. The switching power supply circuit 111 includes an energy storage inductor L1, a first switch tube Q1 and a second switch tube Q2, a first end of the energy storage inductor L1 is electrically connected to the voltage input end In, a second end of the energy storage inductor L1 is electrically connected to a first end of the first switch tube Q1 and a first end of the second switch tube Q2, a second end of the first switch tube Q1 is electrically connected to a second end of the first capacitor C1 and a second end of the second capacitor C2, and a second end of the second switch tube Q2 is electrically connected to the voltage output end Out. The first switch tube Q1 may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), the second switch tube Q2 may be a diode or a MOSFET, if the second switch tube Q2 is a diode, an anode of the diode is electrically connected to the second end of the energy storage inductor L1, and a cathode of the diode is electrically connected to the voltage output terminal Out.
It is understood that the capacity of the electrolytic capacitor may be greatly reduced under low temperature conditions, thereby possibly affecting the stability of the power supply device 100. Therefore, by arranging the heating control circuit 130 including the controllable switch K between the voltage input terminal In and the voltage output terminal Out of the switching power supply circuit 111, and controlling the controllable switch K to be turned on by the preset switch control signal, a charging and discharging loop is formed between the first capacitor C1 and the second capacitor C2, heat is generated under the action of current due to loop impedance existing In the charging and discharging loop, and the second capacitor C2 can be heated by the charging and discharging current, so that the normal use of the power supply device 100 is prevented from being influenced due to the large reduction of the capacity of the second capacitor C2 under the low temperature condition, and the working efficiency of the power supply device 100 under the low temperature condition is ensured.
It can be understood that, as the on-time of the controllable switch K increases, the temperature of the second capacitor C2 gradually increases, and accordingly, the capacity of the second capacitor C2 also gradually increases, and when the capacity of the second capacitor C2 reaches a preset threshold, the switch driving circuit 150 is further configured to drive the controllable switch K to turn off according to the preset switch control signal. Further, since the capacity of the second capacitor C2 can meet the requirement, the switching power supply circuit 111 can be controlled to enter the normal operation mode. The controllable switch K may be a MOSFET or a Bipolar Junction Transistor (BJT).
Referring to fig. 2, in an embodiment, the heating control circuit 130 further includes a current limiting resistor R1, and the current limiting resistor R1 is connected in series with the controllable switch K for limiting the magnitude of the charging and discharging current on the charging and discharging loop. It is understood that the size of the current limiting resistor R1 can be selected according to the current specification of the controllable switch K.
It is understood that, in order to prevent the switch driving circuit 150 from interfering with the switching power supply circuit 111, the switch driving circuit 150 may be configured as an isolated driving circuit.
As shown in fig. 2, in an embodiment, the switch driving circuit 150 may include an optical coupler 151 and a driver 153, where one end of the optical coupler 151 is electrically connected to a signal output end of the driver 153, and the other end of the optical coupler 151 is electrically connected to a control end of the controllable switch K, and is configured to couple a preset switch control signal output by the signal output end of the driver 153 to the control end of the controllable switch K. It can be understood that the switch driving circuit 150 is set as an isolated driving circuit by the optical coupler 151, so that the switch driving circuit 150 can be effectively prevented from generating interference on the switching power supply circuit 111 of the power supply device 100, thereby ensuring the stability of the switching power supply circuit 111.
In one embodiment, the preset switch control signal may be set to be the same as the driving signal of the first switch Q1, so that the charging and discharging circuit may be turned on while the energy storage inductor L1 stores the electric energy, that is, the heating of the second capacitor C2 is completed during the process that the energy storage inductor L1 stores the electric energy. It can be understood that the controllable switch K is controlled by multiplexing the driving signal of the first switching tube Q1, and a driving circuit does not need to be separately provided for the controllable switch K, so that the interference of the separately provided driving circuit to the switching power supply circuit 111 can be prevented, and the production cost of the power supply apparatus 100 can be reduced.
Referring to fig. 3, in an embodiment, the power supply apparatus 100 further includes a capacitor capacity detection circuit 170 electrically connected to the switch driving circuit 150, and the capacitor capacity detection circuit 170 is further electrically connected to the first capacitor C1 and the second capacitor C2, and is configured to detect a capacity of the second capacitor C2 and trigger the switch driving circuit 150 to turn off the controllable switch K when the capacity of the second capacitor C2 exceeds a preset threshold.
In one embodiment, the capacitance and capacitance detecting circuit 170 includes a voltage detecting circuit 171 and a capacitance calculating circuit 173, the voltage detecting circuit 171 is electrically connected to the first capacitor C1 and the second capacitor C2, and is configured to detect a voltage Vc1 of the first capacitor C1 during a period in which the controllable switch K is turned on, and detect a voltage of the second capacitor C2 at least twice, wherein a time interval between two adjacent times of detecting the voltage of the second capacitor C2 is a preset time interval tx, and obtain a first voltage Vbus1 of the second capacitor C2 and a second voltage Vbus2 of the second capacitor C2 respectively, and the capacitance calculating circuit 173 is configured to calculate a capacitance of the second capacitor C2 according to the voltage Vc1 of the first capacitor C1, the first voltage Vbus1 and the second voltage Vbus2 of the second capacitor C2, and the preset time interval tx.
It is understood that, in an embodiment, the capacity calculating circuit 173 may include a processor (not shown), the processor triggering the voltage detecting circuit 171 to detect the voltages of the first capacitor C1 and the second capacitor C2, and recording a preset time interval tx between the first voltage Vbus1 and the second voltage Vbus2 of the second capacitor C1, further calculating the capacity of the second capacitor C2 according to the voltage Vc1 of the first capacitor C1, the first voltage Vbus1 and the second voltage Vbus2 of the second capacitor C2, and the preset time interval tx, and comparing the capacity of the second capacitor C2 with a preset threshold, and triggering the switch driving circuit 150 to output a control signal for turning off the controllable switch K when the capacity of the second capacitor C2 is greater than or equal to the preset threshold. It is understood that the processor may also be electrically connected to the driving circuit (not shown) of the first switch Q1 and the second switch Q2, so as to control the switching power supply circuit 111 to enter a normal operation mode after triggering the switch driving circuit 150 to output a control signal for turning off the controllable switch K.
Specifically, when the heating control circuit 130 includes the current limiting resistor R1, the current I1 passing through the current limiting resistor R1 is (VBUS-Vc1)/R1 within the preset time interval tx, where VBUS is a mean value of the first voltage VBUS1 and the second voltage VBUS2, or VBUS may also be approximately equal to the first voltage VBUS1 or the second voltage VBUS 2. Accordingly, in the preset time interval tx, the amount of discharged charge of the second capacitor C2 is Q1 tx (VBUS-Vc1) tx/R1, and the voltage variation U of the second capacitor C2 is VBUS1 VBUS 2. According to the above conditions, the current capacitance C of the second capacitor C2 may be calculated as (VBUS-Vc1) tx/[ R1 (VBUS1-VBUS2) ]. It is understood that if the heating control circuit 130 does not include the current limiting resistor R1, an equivalent impedance across the heating control circuit 130 may be substituted.
It will be appreciated that due to the Equivalent Series Resistance (ESR) that may be present in the capacitors, it is to be avoided as much as possible to detect the first voltage Vbus1 of the second capacitor C2 when the controllable switch K is just turned on. If the first voltage Vbus1 of the second capacitor C2 is to be detected when the controllable switch K is just turned on, the first voltage Vbus1 needs to be subtracted by ESR (Vbus-Vc 1)/R1. If the voltage of the second capacitor C2 is detected at an arbitrary time when the controllable switch K is turned on, the influence of ESR does not need to be considered.
It is understood that, in one embodiment, since the second capacitor C2 discharges the first capacitor C1 through the heating control circuit 130, the capacitance change of the second capacitor C1 can also be determined through the capacitance detection of the first capacitor C1. It is understood that, for the capacity detection of the first capacitor C1, the same method as the capacity detection of the second capacitor C2 may be adopted, and specific reference may be made to the description related to the embodiment shown in fig. 3, and details are not described here again.
Referring to fig. 4, in an embodiment of the present invention, a capacitance heating control method is provided, which can be applied to the power supply apparatus 100 provided in the embodiments shown in fig. 1 to fig. 3, for performing heating control on a capacitor of the power supply apparatus 100, and the capacitance heating control method at least includes the following steps:
step 401: a heating control circuit is arranged between a voltage input end and a voltage output end of the voltage conversion circuit, and the heating control circuit comprises a controllable switch;
step 402: driving the controllable switch to be conducted according to a preset switch control signal, and forming a charge-discharge loop between a first capacitor and a second capacitor of the voltage conversion circuit;
step 403: and conducting charge-discharge current between the first capacitor and the second capacitor through the charge-discharge loop, and heating the second capacitor through the charge-discharge current.
Referring to fig. 5, in one embodiment, the method further includes:
step 404: and detecting the capacity of the second capacitor, and triggering the switch driving circuit to stop working when the capacity of the second capacitor exceeds a preset threshold value, so that the power supply device enters a normal working state.
Referring to fig. 6, in one embodiment, the detecting the capacitance of the second capacitor includes:
step 601: detecting a voltage of the first capacitance during the conduction of the controllable switch;
step 602: detecting the voltage of the second capacitor at least twice during the conduction period of the controllable switch to obtain a first voltage of the second capacitor and a second voltage of the second capacitor respectively, wherein the time interval of detecting the voltage of the second capacitor twice is a preset time interval;
step 603: and calculating the capacity of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor and the preset time interval.
It is to be understood that specific implementation of each step in the capacitive heating control method may also refer to the related description in the embodiments shown in fig. 1 to fig. 3, and details are not described herein again.
In the embodiment of the invention, the power supply device and the capacitance heating control method thereof control the conduction of the controllable switch in the heating control circuit through the preset switch control signal, so that a charge-discharge loop is formed between the first capacitor and the second capacitor, and as the charge-discharge loop can generate heat under the action of current, the second capacitor can be heated through the charge-discharge current between the first capacitor and the second capacitor, the influence on the normal use of the power supply device due to the large reduction of the capacity of the second capacitor under the low-temperature condition can be effectively prevented, and the working efficiency of the power supply device under the low-temperature condition can be ensured.
Claims (15)
1. A power supply device, comprising: a voltage conversion circuit and a heating control circuit;
the voltage conversion circuit comprises a switching power supply circuit, a first capacitor and a second capacitor, the switching power supply circuit comprises a voltage input end and a voltage output end, the first end of the first capacitor is electrically connected with the voltage input end, the first end of the second capacitor is connected with the voltage output end, and the second end of the first capacitor is electrically connected with the second end of the second capacitor;
the heating control circuit comprises a controllable switch, the controllable switch is electrically connected between the voltage input end and the voltage output end, the controllable switch is used for being conducted under the driving of a preset switch control signal, and a charging and discharging loop is formed between the first capacitor and the second capacitor;
the charge-discharge loop is used for conducting charge-discharge current between the first capacitor and the second capacitor and heating the second capacitor through the charge-discharge current;
the switching power supply circuit comprises an energy storage inductor, a first switching tube and a second switching tube, wherein the first end of the energy storage inductor is electrically connected with the voltage input end, the second end of the energy storage inductor is electrically connected with the first end of the first switching tube and the first end of the second switching tube, the second end of the first switching tube is electrically connected with the second end of the first capacitor and the second end of the second capacitor, and the second end of the second switching tube is electrically connected with the voltage output end.
2. The power supply apparatus of claim 1, wherein the heating control circuit further comprises a current limiting resistor connected in series with the controllable switch for limiting the magnitude of the charging and discharging current on the charging and discharging loop.
3. The power supply device according to claim 1 or 2, further comprising a switch driving circuit electrically connected to the control terminal of the controllable switch, for outputting the preset switch control signal and driving the controllable switch to be turned on or off according to the preset switch control signal.
4. The power supply device according to claim 3, wherein the switch driving circuit is an isolated driving circuit.
5. The power supply device according to claim 3, wherein the switch driving circuit comprises an optical coupler and a driver, one end of the optical coupler is electrically connected to the signal output terminal of the driver, and the other end of the optical coupler is electrically connected to the control terminal of the controllable switch, for coupling a preset switch control signal output from the signal output terminal of the driver to the control terminal of the controllable switch.
6. The power supply device according to any one of claims 1 to 2, wherein the preset switch control signal is the same as a driving signal of the first switching tube.
7. The power supply device according to claim 3, wherein the predetermined switch control signal is the same as a driving signal of the first switching tube.
8. The power supply device according to claim 4, wherein the predetermined switch control signal is the same as a driving signal of the first switching tube.
9. The power supply device according to claim 5, wherein the predetermined switch control signal is the same as a driving signal of the first switching tube.
10. The power supply device according to claim 3, further comprising a capacitance detection circuit electrically connected to the switch driving circuit, wherein the capacitance detection circuit is further electrically connected to the first capacitor and the second capacitor, and configured to detect a capacitance of the second capacitor, and when the capacitance of the second capacitor exceeds a preset threshold, trigger the switch driving circuit to stop operating, and the power supply device enters a normal operating state.
11. The power supply apparatus according to claim 10, wherein the capacitance capacity detection circuit includes a voltage detection circuit and a capacity calculation circuit, the voltage detection circuit is electrically connected to the first capacitor and the second capacitor, and is configured to detect a voltage of the first capacitor during the conduction period of the controllable switch and detect a voltage of the second capacitor at least twice, wherein a time interval between two adjacent times of detecting the voltage of the second capacitor is a preset time interval, and obtain a first voltage of the second capacitor and a second voltage of the second capacitor, respectively, and the capacity calculation circuit is configured to calculate the capacity of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor, and the preset time interval.
12. A power supply device, comprising: a voltage conversion circuit and a heating control circuit;
the voltage conversion circuit comprises a switching power supply circuit, a first capacitor and a second capacitor, the switching power supply circuit comprises a voltage input end and a voltage output end, the first end of the first capacitor is electrically connected with the voltage input end, the first end of the second capacitor is connected with the voltage output end, and the second end of the first capacitor is electrically connected with the second end of the second capacitor;
the heating control circuit comprises a controllable switch, the controllable switch is electrically connected between the voltage input end and the voltage output end, the controllable switch is used for being conducted under the driving of a preset switch control signal, and a charging and discharging loop is formed between the first capacitor and the second capacitor;
the charge-discharge loop is used for conducting charge-discharge current between the first capacitor and the second capacitor and heating the second capacitor through the charge-discharge current;
the power supply device further comprises a switch driving circuit, wherein the switch driving circuit is electrically connected with the control end of the controllable switch and is used for outputting the preset switch control signal and driving the controllable switch to be switched on or switched off according to the preset switch control signal;
the power supply device further comprises a capacitance capacity detection circuit electrically connected with the switch driving circuit, the capacitance capacity detection circuit is further electrically connected with the first capacitor and the second capacitor and is used for detecting the capacity of the second capacitor, when the capacity of the second capacitor exceeds a preset threshold value, the switch driving circuit is triggered to stop working, and the power supply device enters a normal working state;
the capacitance capacity detection circuit comprises a voltage detection circuit and a capacity calculation circuit, the voltage detection circuit is electrically connected with the first capacitor and the second capacitor and is used for detecting the voltage of the first capacitor during the conduction period of the controllable switch and detecting the voltage of the second capacitor at least twice, the time interval of the voltage of the second capacitor detected twice is a preset time interval, the first voltage of the second capacitor and the second voltage of the second capacitor are obtained respectively, and the capacity calculation circuit is used for calculating the capacity of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor and the preset time interval.
13. A capacitance heating control method of a power supply device according to any one of claims 1 to 12, comprising:
a heating control circuit is arranged between a voltage input end and a voltage output end of the voltage conversion circuit, and the heating control circuit comprises a controllable switch;
driving the controllable switch to be conducted according to a preset switch control signal, and forming a charge-discharge loop between a first capacitor and a second capacitor of the voltage conversion circuit;
and conducting charge-discharge current between the first capacitor and the second capacitor through the charge-discharge loop, and heating the second capacitor through the charge-discharge current.
14. The method of claim 13, wherein in the case where the power supply device further comprises a switch drive circuit, the method further comprises: and detecting the capacity of the second capacitor, and triggering the switch driving circuit to stop working when the capacity of the second capacitor exceeds a preset threshold value, so that the power supply device enters a normal working state.
15. The method of claim 14, wherein said detecting the capacitance of the second capacitor comprises:
detecting a voltage of the first capacitance during the conduction of the controllable switch;
detecting the voltage of the second capacitor at least twice during the conduction period of the controllable switch to obtain a first voltage of the second capacitor and a second voltage of the second capacitor respectively, wherein the time interval of detecting the voltage of the second capacitor twice is a preset time interval;
and calculating the capacity of the second capacitor according to the voltage of the first capacitor, the first voltage and the second voltage of the second capacitor and the preset time interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710284565.0A CN107070190B (en) | 2017-04-26 | 2017-04-26 | Power supply device and capacitance heating control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710284565.0A CN107070190B (en) | 2017-04-26 | 2017-04-26 | Power supply device and capacitance heating control method thereof |
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| Publication Number | Publication Date |
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| CN107070190A CN107070190A (en) | 2017-08-18 |
| CN107070190B true CN107070190B (en) | 2020-06-09 |
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| CN107390437A (en) * | 2017-09-06 | 2017-11-24 | 惠科股份有限公司 | A kind of liquid crystal dripping device |
| CN113067473B (en) | 2020-01-02 | 2022-05-24 | 阳光新能源开发股份有限公司 | Control signal modulation circuit, inverter and control system |
| JP2023539843A (en) * | 2020-08-25 | 2023-09-20 | アステック インターナショナル リミテッド | Bulk capacitor heating circuit in power converter |
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