CN117375178A - Discharge device for PD chip and discharge method thereof - Google Patents
Discharge device for PD chip and discharge method thereof Download PDFInfo
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- CN117375178A CN117375178A CN202311481861.1A CN202311481861A CN117375178A CN 117375178 A CN117375178 A CN 117375178A CN 202311481861 A CN202311481861 A CN 202311481861A CN 117375178 A CN117375178 A CN 117375178A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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Abstract
The application provides a discharge device for a PD chip and a discharge method thereof. The discharging device comprises a temperature detection circuit, a discharging current selection module and a discharging mode selection module. The temperature detection circuit is used for detecting the temperature of the PD chip. The discharging current selecting module is used for selecting corresponding discharging current according to the discharging voltage to be discharged by the PD chip. The discharge mode selection module is used for selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip. The discharging method comprises the following steps: detecting the temperature of the PD chip; selecting a corresponding discharge current according to a discharge voltage to be discharged by the PD chip; and selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip. The discharging current can adapt to different discharging voltages to be discharged by the PD chip, and different discharging modes can be selected according to the detected temperature of the PD chip, so that the optimal performance and safety are achieved.
Description
Technical Field
The embodiment of the application relates to the technical field of discharge, in particular to a discharge device for a PD chip and a discharge method thereof.
Background
The new specifications promulgated by USB PD (Universal Serial Bus Power Delivery ) extend the power range to higher levels. The maximum output power is changed from 100W to 240W. The output voltage is expanded to be more than 20V, including new specifications of 24V, 36V, 48V and the like. The output voltage is higher, and at the same current level, such as maximum 5A, the output power can be as high as 120W-240W.
These voltages are required in higher voltage battery applications such as electric bicycles, electric tool markets, or other possible battery powered applications. The larger the charging power, the faster the charging speed.
In the USB PD specification, the output voltage may vary from a lower initial voltage to a higher voltage defined in the specification protocol. Within the previously defined nominal power range, 3.3V or 5V is generally considered to be a typical initial output voltage, while 20V is the maximum output voltage. For extended power range specifications, the lower initial voltage may be 15V and the higher power output voltage may be up to 48V. These output voltage ranges may be extended to higher levels in the future due to newly defined battery powered applications. Fig. 1 discloses a graph of the variation of the output voltage Vout of the PD chip. As shown in fig. 1, when the output voltage Vout changes from one level to another, the voltage change rateAnd voltage stabilization time t settle There are specific limitations.
For example, the rate at which the voltage rises and falls isWith a defined maximum allowable V slew Level to ensure that the system can handle voltage variations without too many over-voltage or under-voltage spikes.
At the same time, the voltage settling time also has a maximum allowable time to ensure that the regulated voltage level is reached within a reasonable time frame. A certain voltage change rate is defined as the lowest value in the voltage conversion process.
A large capacitor is typically connected to the power output port. Typical dimensions may range from 1uF (microfarads) to 100uF or more, depending on the application voltage transient requirements. The voltage is required to pass through the bus voltage V when the voltage rises bus The output capacitor is charged. The charging energy is derived from the load current provided by the power supply. In the event of a voltage drop, the output load will typically drop to a small level and then be quickly removed as a result of the switch connected between the power supply and the load path opening.
When the output load is removed (the load path is disconnected), the voltage on the bus capacitor remains high due to the lack of a discharge path. Discharging the bus capacitor is a long-term operation, especially when the bus capacitor is empty with a large bus capacitor.
To solve this problem, the interface protocol IC has a discharging capability, and can discharge the capacitance voltage on the bus, i.e. the bus voltage V, when the bus is changed from high to low, or the load is disconnected from the bus, or the bus voltage exceeds a preset value (overvoltage condition) bus 。
However, in current design, these discharge currents are a fixed current source with a pre-designed value connected to the design pin (VIN or VOUT pin). The strong discharge current (which may be 5-10 mA) will remain unchanged regardless of the voltage variation range.
For example, if the bus voltage is changed from 20V to 5V, the discharge current is I dis (e.g., 10 mA). For the bus voltage changing from 9V to 5V, if the discharge current is kept unchanged in the common design, the current is still I dis . In this case, the discharge time will be proportionally shorter when 9V becomes 5V than when 20V becomes 5V.
With the extended power range of USB PDs, it will become more and more challenging to extend the output voltage range to a maximum of 48V while meeting the voltage change rate and voltage settling time requirements.
For example, for a voltage change from 20V to 5V, an output capacitance of 100uF, and a designed discharge current of 10mA, the discharge time can be calculated according to the following formula, as follows:
C×(V2-V1)＝I dis *t dis
wherein C is the output capacitance, V2 and V1 are the voltage values before and after discharge respectively, I dis For discharging current, t dis Is the discharge time.
t dis ＝100uF×(20V-5V)/10mA＝150ms
When the voltage is changed from 48V to 5V, then the discharge time will become:
t dis ＝100uF×(48V-5V)/10mA＝430ms
comparing the above examples, it can be seen that the higher the voltage variation, the longer the discharge time. Most importantly, if a larger output capacitance is selected for stabilizing a higher output voltage, the discharge time is further prolonged, and it is not easy to meet the discharge time specification and voltage conversion rate requirements in a single design.
For example, if the output capacitance expands to 1000uF, the discharge time will become:
t dis ＝1000uF×(48V-5V)/10mA＝4300ms
increasing the discharge current will proportionally shorten the discharge time, but this solution suffers from heat loss. Higher discharge currents will result in more losses in the discharge chip (IC). This means that there is a third factor in this trade-off: due to thermal limitations, the selection of a higher discharge current is limited.
The power loss can be calculated according to the following formula:
P loss ＝Vout×I dis
wherein P is loss Vout is the output voltage for power loss.
For example, a 48V output voltage and a 10mA discharge current would result in a maximum loss of 480mW for the protocol interface IC, which is certainly a thermal challenge for the IC.
The trade-off between voltage change settling time and thermal issues is difficult to meet for high output voltage applications.
For wider voltage variation range applications, it is difficult to find a solution for voltage variation settling time and controllable thermal performance fast enough at a single discharge current.
Disclosure of Invention
An objective of the embodiments of the present application is to provide a discharging device and a discharging method for a PD chip, which aims to solve at least one technical problem mentioned in the prior art.
One aspect of an embodiment of the present application provides a discharge device for a PD chip. The discharging device comprises a temperature detection circuit, a discharging current selection module and a discharging mode selection module. The temperature detection circuit is used for detecting the temperature of the PD chip. The discharge current selection module is used for selecting a corresponding discharge current according to the discharge voltage to be discharged by the PD chip. The discharging mode selection module is used for selecting a discharging mode corresponding to the discharging current according to the detected temperature of the PD chip.
Another aspect of the embodiments of the present application also provides a discharging method for a PD chip. The discharging method comprises the following steps: detecting the temperature of the PD chip; selecting a corresponding discharge current according to a discharge voltage to be discharged by the PD chip; and selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip.
The discharging device for a PD chip and the discharging method thereof according to one or more embodiments of the present application may achieve at least one of the following beneficial technical effects:
(1) Different discharge currents can be selected according to the discharge voltage to be discharged by the PD chip, and when the discharge voltage to be discharged is high, the discharge speed is high;
(2) The discharging voltage to be discharged by the PD chip can reach the set level more quickly;
(3) The temperature of the PD chip can be sensed, different heat modes can be defined, and faster and safer protection can be provided, so that the optimal performance and safety are achieved;
(4) The thermal problem of the PD chip can be ameliorated by adjusting the switching of the discharge current (controlled by PWM signals).
Drawings
Fig. 1 is a graph of variation in output voltage of a PD chip.
Fig. 2 is an overall schematic diagram of a discharge device for a PD chip according to one embodiment of the present application.
Fig. 3 is a schematic diagram showing a relationship between discharge currents of four discharge modes and a temperature of a PD chip according to an embodiment of the present application.
Fig. 4 is a schematic diagram showing a change of a discharge current of a second discharge mode with time according to an embodiment of the present application.
Fig. 5 is a schematic diagram illustrating the configuration of a PWM output control module and implementation of a PWM discharge mode according to an embodiment of the present application.
Fig. 6 is a flowchart of a discharge method for a PD chip according to one embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
One embodiment of the present application provides a discharge apparatus for a PD chip. Fig. 2 discloses an overall schematic diagram of a discharge device 1 for a PD chip according to one embodiment of the present application. The PD chip has an input terminal VIN and an output terminal VOUT. The discharging device 1 can reasonably discharge the discharging voltage when the PD chip needs to discharge the voltage. In one embodiment, the case that the PD chip needs to discharge the voltage may include the case that the input terminal VIN of the PD chip needs to discharge the voltage, for example, when the charger is unplugged, the charging switch Q is turned off, and the input terminal VIN and the output terminal VOUT of the PD chip are turned off, at this time, the discharging device 1 is connected to the input terminal VIN of the PD chip, and the input voltage of the input terminal VIN of the PD chip may be discharged. In another embodiment, the case that the PD chip needs to discharge the voltage may include the case that the output terminal VOUT of the PD chip needs to discharge the voltage, for example, when the load is pulled out, the bus voltage terminal VBUS is disconnected from the load, and at this time, the discharging device 1 is connected to the output terminal VOUT of the PD chip, and the output voltage VOUT of the output terminal VOUT of the PD chip may be discharged.
As shown in fig. 2, the discharging device 1 for a PD chip according to an embodiment of the present application includes a temperature detection circuit 11, a discharge current selection module 12, and a discharge mode selection module 13. The temperature detection circuit 11 may be used to detect the temperature T of the PD chip. The discharge current selection module 12 can select the discharge voltage V to be discharged according to the PD chip dis To select the corresponding discharge current I dis . When the input end of the PD chip needs to discharge voltage, the PD chip discharges the discharge voltage V dis An input voltage including a PD chip; when the output end of the PD chip needs to discharge voltage, the PD chip discharges the discharge voltage V dis Including the output voltage Vout of the PD chip. The discharge pattern selection module 13 may select a discharge pattern corresponding to the discharge current according to the detected temperature T of the PD chip.
The discharging device 1 for PD chip of the present application can discharge the voltage V according to the PD chip dis Is provided with an adaptive discharge current I dis And, an adaptive discharge mode may be selected according to the temperature T of the PD chip, thereby helping to meet the specification requirements for discharge time and thermal problems. In the embodiment illustrated in the present application, the output terminal VOUT of the PD chip is used for discharging voltage, i.e. the discharge voltage V to be discharged by the PD chip dis The case of including the output voltage Vout of the PD chip is schematically illustrated as an example. It will be appreciated that the overall architecture of the discharging device 1 for a PD chip of the present application can be equally applied to the case where the input terminal VIN of the PD chip requires a discharge voltage, i.e. the discharge voltage V to be discharged by the PD chip dis Including the case of the input voltage of a PD chip.
In some embodiments, the discharge current selection module 12 includes a plurality of discharge current branches 121-124 and a current source switch control module 120. Each discharge current branch 121/122/123/124 includes a current source A1/A2/A3/A4 for outputting a different discharge current and a current source selection switch S1/S2/S3/S4 correspondingly connected to the current source A1/A2/A3/A4. For example, in the illustrated embodiment of the present application, the discharge current selection module 12 includes four discharge current branches, namely, a first discharge current branch 121, a second discharge current branch 122, a third discharge current branch 123, and a fourth discharge current branch 124. The first discharge current branch 121 comprises a current source A1 and a current source selection switch S1, the second discharge current branch 122 comprises a current source A2 and a current source selection switch S2, the third discharge current branch 123 comprises a current source A3 and a current source selection switch S3, and the fourth discharge current branch 124 comprises a current source A4 and a current source selection switch S4. The current source switch control module 120 can discharge the discharge voltage V according to the PD chip dis To trigger the current source selection switches in the respective discharge current branches to close to output the corresponding discharge current.
For example, the discharge voltage V to be discharged by the PD chip can be dis Four gears are respectively V dis ≤20V，20V<V dis ≤30V，30V<V dis ≤40V，40V<V dis And the voltage is less than or equal to 50V. Can be discharged according to the discharge voltage V of the PD chip dis To select the corresponding discharge current branch. For example, when the PD chip is to discharge the discharge voltage V dis When the voltage is less than or equal to 20V, the first discharging current branch 121 can be selected, the current source switch control module 120 can trigger the current source selection switch S1 in the first discharging current branch 121 to be closed, and at the moment, the current source A1 outputs the first discharging current I dis1 The method comprises the steps of carrying out a first treatment on the surface of the When the discharge voltage to be discharged by the PD chip meets 20V<V dis When the voltage is less than or equal to 30V, the second discharging current branch 122 can be selected, the current source switch control module 120 can trigger the current source selecting switch S2 in the second discharging current branch 122 to be closed, and at the moment, the current source A2 outputs the second discharging current I dis2 The method comprises the steps of carrying out a first treatment on the surface of the When the discharge voltage to be discharged by the PD chip meets 30V<V dis When the voltage is less than or equal to 40V, the third discharge current branch 123 can be selected, the current source switch control module 120 can trigger the current source selection switch S3 in the third discharge current branch 123 to be closed, and at the moment, the current source A3 outputs the third discharge current I dis3 The method comprises the steps of carrying out a first treatment on the surface of the When the discharge voltage to be discharged by the PD chip meets 40V<V dis When the voltage is less than or equal to 50V, the fourth discharging current branch 124 can be selected, the current source switch control module 120 can trigger the current source selecting switch S4 in the fourth discharging current branch 124 to be closed, and at the moment, the current source A4 outputs the fourth discharging current I dis4 . It can be appreciated that the PD chip of the present application discharges a discharge voltage V dis The setting of the shift positions and the number of corresponding discharge current branches is not limited to that shown in the drawings. In practical application, reasonable selection can be performed according to an actual PD chip. Whenever possible according to the discharge voltage V to be discharged by the PD chip dis The design to select the corresponding discharge current branch is within the scope of the discharge current selection module 12 of the present application.
In some embodiments, the discharging device 1 for PD chip of the present application may further include a bleed-voltage feedback module 14. The bleed-off voltage feedback module 14 may be used to detect a discharge voltage V to be bled off by the PD chip dis And discharge voltage V to be discharged by the detected PD chip dis And fed back to the discharge current selection module 12.
With continued reference to FIG. 2, in some embodiments, the discharge mode selection module 13 of the present application includes a plurality of duty cycle selection switches K1-K4 and a PWM output control module 130. The plurality of duty cycle selection switches K1-K4 are respectively and correspondingly connected in series in the plurality of discharge current branches 121-124. For example, in the illustrated embodiment of the present application, the discharge current selection module 12 includes four duty cycle selection switches K1, K2, K3, and K4, wherein the duty cycle selection switch K1 is connected in series in the first discharge current branch 121; the duty cycle selection switch K2 is connected in series in the second discharge current branch 122; the duty cycle selection switch K3 is connected in series in the third discharge current branch 123; the duty cycle selection switch K4 is connected in series in the fourth discharge current branch 124. The PWM output control module 130 may output a PWM signal with a corresponding duty ratio according to the temperature T of the PD chip detected by the temperature detection circuit 11, and may control on and off times of the plurality of duty ratio selection switches K1 to K4 based on the PWM signal with the corresponding duty ratio.
Wherein, when the temperature T of the PD chip detected by the temperature detection circuit 11 is higher, the duty cycle (duty cycle) of the PWM signal output by the PWM output control module 130 is lower; the lower the temperature T of the PD chip detected by the temperature detection circuit 11, the higher the duty ratio of the PWM signal output by the PWM output control module 130.
The discharging device 1 for a PD chip of the present application can further improve the discharging function according to the temperature T of the PD chip. In some embodiments, the discharge mode selection module 13 of the present application stores a plurality of different discharge modes, where the plurality of different discharge modes respectively correspond to a plurality of temperature ranges of the PD chip. The discharge pattern selection module 13 may select a corresponding discharge pattern based on a temperature range in which the temperature T of the PD chip detected by the temperature detection circuit 11 falls.
In some embodiments, the plurality of different discharge modes may include, for example, four discharge modes, which are a first discharge mode, a second discharge mode, a third discharge mode, and a fourth discharge mode, respectively.
Fig. 3 discloses a schematic diagram of the relationship between the discharge current of four discharge modes and the temperature T of the PD chip according to one embodiment of the present application. How the discharging device 1 for a PD chip of the present application selects a corresponding discharging mode according to the temperature T of the PD chip will be described in detail below with reference to fig. 3.
As shown in fig. 3, in order to protect the PD chip, the temperature T of the PD chip is set to three critical temperature thresholds, respectively, a predetermined second over-temperature protection threshold T OTP2 A predetermined first overtemperature protection threshold T OTP1 And a predetermined high temperature threshold T H Wherein the second overtemperature protection threshold T OTP2 Greater than a first overtemperature protection threshold T OTP1 First overtemperature protection threshold T OTP1 Greater than the high temperature threshold T H T, i.e OTP2 >T OTP1 >T H . In one embodiment, a second overtemperature protection threshold T OTP2 For example, 160 ℃ can be adopted, and the first over-temperature protection threshold T OTP1 Can be 140 ℃, high temperature threshold T H May be 100 ℃. Of course, it is understood that the second overtemperature protection threshold T OTP2 First overtemperature protection threshold T OTP1 And a high temperature threshold T H The specific numerical value of the PD chip is not limited to this, and may be set reasonably according to the actual PD chip, which is not limited in this application.
At the temperature T of the PD chip being higher than a preset second over-temperature protection threshold T OTP2 T is not less than T OTP2 When this is the case, the discharge mode selection module 13 may select the first discharge mode.
In one embodiment, the first discharge mode may include, for example: the discharge current is immediately turned off and the discharge is stopped. In another embodiment, the first discharge mode may also include: the discharge is performed with a predetermined minimum discharge current.
When the temperature T of the PD chip is higher than the second over-temperature protection threshold T OTP2 For example, 160 ℃ indicates that the temperature T of the PD chip is very high, heat may be a dangerous factor and damage to the PD chip is very likely, so that the protection of the PD chip is a priority problem, the protection function of OTP (Over Temperature Protection, over-temperature protection) needs to be triggered immediately, and the temperature T of the PD chip is reduced as soon as possible, so that the discharge mode of the application is selectedThe module 13 will select the first discharge mode.
At the temperature T of the PD chip being higher than a preset first overtemperature protection threshold T OTP1 But not higher than a second overtemperature protection threshold T OTP2 T, i.e OTP1 ≤T<T OTP2 At this time, the discharge mode selection module 13 may select the second discharge mode.
FIG. 4 is a graph showing a discharge current of a second discharge mode according to an embodiment of the present application. As shown in fig. 4, in one embodiment, the second discharge mode is a low discharge mode, which includes: discharging at a predetermined low percentage of the selected discharge current until a discharge voltage V at which the PD chip is to be discharged dis To a predetermined low voltage threshold and then, completely shut down the discharge current.
When the temperature T of the PD chip is higher than a preset first over-temperature protection threshold T OTP1 But not higher than a second overtemperature protection threshold T OTP2 In this case, it is indicated that the temperature T of the PD chip is somewhat high, and the OTP protection function needs to be triggered to lower the temperature T of the PD chip, but low-current discharge is still possible. For example, as shown at time t1 in fig. 4, the discharge current may be reduced to, for example, about 10% of the original discharge current level, and discharged for a predetermined time, for example, 10ms (milliseconds). As shown at time t2 in fig. 4, when the PD chip is to discharge the discharge voltage V dis Below a given low voltage threshold level, for example 5V or 10V, the discharge current is then completely turned off.
It is understood that the time-dependent discharge current curve of the second discharge mode of the present application is not limited to that shown in fig. 4, and in other embodiments, the time-dependent discharge current curve of the second discharge mode may also be changed.
At a temperature T of the PD chip higher than a predetermined high temperature threshold T H But not higher than the first overtemperature protection threshold T OTP1 T, i.e H ≤T<T OTP1 At this time, the discharge mode selection module 13 may select the third discharge mode.
In one embodiment, the third discharge mode is a PWM discharge mode, comprising: the selected discharge current is controlled to be periodically turned on and off.
When the temperature T of the PD chip is higher than a predetermined high temperature threshold T H But not higher than the first overtemperature protection threshold T OTP1 In this case, it is explained that the temperature T of the PD chip is not destructively high, but the discharge function can still be maintained, but unlike the second discharge mode, the third discharge mode does not discharge with a fixed discharge current, but rather the discharge current is modified to be periodically turned off, like a PWM signal with a different duty cycle. When the PWM signal is at a high level, discharging is started, and discharging current is output; when the PWM signal is at a low level, the discharge is turned off, and the output of the discharge current is stopped. The PD chip is heated when the PWM signal is at a high level; when the PWM signal is low, the PD chip releases heat.
Fig. 5 discloses a schematic diagram of the PWM output control module 130 and the implementation of the PWM discharge mode according to one embodiment of the present application. How the discharging device 1 for a PD chip of the present application implements the PWM discharging mode will be described in detail below with reference to fig. 5.
As shown in fig. 5, in some embodiments, the PWM output control module 130 may include a voltage supply module 131 and a comparator 132. Comparator 132 has a positive input (+) a negative input (-) and an output.
The voltage providing module 131 may provide a corresponding detection voltage Vtemp according to the detected temperature T of the PD chip. Wherein the supplied detection voltage Vtemp increases with an increase in the detected temperature T of the PD chip.
The positive input of the comparator 132 may be connected to a signal generator, which may be used to receive the sawtooth signal Vs; the negative input terminal of the comparator 132 is connected to the voltage providing module 131, and can be used to receive the detection voltage Vtemp provided by the voltage providing module 131.
The comparator 132 may compare the received sawtooth wave signal Vs with the magnitude of the supplied detection voltage Vtemp and output a PWM signal based on the result of the comparison. As shown in the waveforms in fig. 5, the higher the supplied detection voltage Vtemp, the smaller the duty ratio of the output PWM signal; the lower the supplied detection voltage Vtemp is, the larger the duty ratio of the output PWM signal is.
Referring to fig. 2 in combination, the discharge mode selection module 13 may control the on and off times of the duty ratio selection switches connected in series in the corresponding discharge current branches by outputting PWM signals with different duty ratios, thereby controlling the selected discharge current to be periodically turned on and off.
As shown in fig. 3, the discharge current in the third discharge mode linearly decreases with an increase in the temperature T of the PD chip. Optionally, the minimum discharge current in the third discharge mode is greater than the discharge current in the second discharge mode.
At a temperature T of the PD chip not higher than a high temperature threshold T H T, i.e<T H At this time, the discharge mode selection module 13 may select the fourth discharge mode.
In one embodiment, the fourth discharge mode is a high discharge mode, comprising: the continuous discharge is performed with a selected discharge current.
Another embodiment of the present application also provides a discharge method for a PD chip. Fig. 6 discloses a flowchart of a discharge method for a PD chip according to one embodiment of the present application. As shown in fig. 6, the discharging method for the PD chip of one embodiment of the present application may include steps S1 to S3.
In step S1, the temperature T of the PD chip is detected.
In step S2, a discharge voltage V to be discharged according to the PD chip dis To select the corresponding discharge current.
In step S3, a discharge mode corresponding to the discharge current may be selected according to the detected temperature T of the PD chip.
In some embodiments, the discharging method for a PD chip of the present application may further include step S4. In step S4, the discharge voltage V to be discharged by the PD chip is detected and fed back dis . In step S2, the discharge voltage V to be discharged according to the fed back PD chip dis To control the selection of the corresponding discharge current.
In some embodiments, step S3 may further include steps S31 to S34.
In step S31, when the detected temperature T of the PD chip is higher than a predetermined second over-temperature protection threshold T OTP2 When this is the case, control selects the first discharge mode.
The control in step S31 to select the first discharge mode may include: controlling to immediately turn off the discharge current; alternatively, the control is performed to discharge at a predetermined minimum discharge current.
In step S32, when the detected temperature T of the PD chip is higher than a predetermined first over-temperature protection threshold T OTP1 But not higher than a second overtemperature protection threshold T OTP2 And if so, controlling to select a second discharge mode.
The control in step S32 to select the second discharge mode may include: controlling discharging at a predetermined low percentage of the selected discharge current until the discharge voltage V to be discharged by the PD chip dis To a predetermined low voltage threshold and then, completely shut down the discharge current.
In step S33, when the detected temperature T of the PD chip is higher than a predetermined high temperature threshold T H But not higher than the first overtemperature protection threshold T OTP1 And if so, controlling to select a third discharge mode.
The control in step S33 to select the third discharge mode may include: the selected discharge current is controlled to be periodically turned on and off.
Wherein the on and off time of the selected discharge current can be controlled by outputting PWM signals with different duty ratios, thereby controlling the discharge current to be periodically turned on and off.
In step S34, when the detected temperature T of the PD chip is not higher than the high temperature threshold T H And if so, controlling to select a fourth discharge mode.
Wherein the second overtemperature protection threshold T OTP2 Greater than a first overtemperature protection threshold T OTP1 First overtemperature protection threshold T OTP1 Greater than the high temperature threshold T H 。
The control in step S34 to select the fourth discharge mode may include: the continuous discharge is controlled to be performed at the selected discharge current.
The discharging device 1 for PD chip and the discharging method thereof according to one or more embodiments of the present application can achieve at least one of the following advantageous technical effects:
(1) Can be discharged according to the discharge voltage V of the PD chip dis Selecting different discharge currents to be used, and discharging voltage V to be discharged dis When the discharge speed is high, the discharge speed is high;
(2) Discharge voltage V for discharging PD chip dis The set level can be reached more quickly;
(3) The temperature T of the PD chip can be sensed and different thermal modes defined. Providing faster and safer protection;
(4) Thermal issues of PD chips can be addressed by adjusting discharge current I dis Is improved (by PWM signal control).
In addition, the configuration and implementation of the discharging device and the discharging method thereof are described above by taking the PD chip as an example, however, the present application is not limited to discharging the PD chip, and in other embodiments, the concept of the discharging device and the discharging method thereof can be fully applied to discharging the discharging voltage of any specified circuit chip in the charger product, for example, but not limited to, an AC-DC (alternating current-direct current) converter chip in the charger product, and the like.
The discharge device and the discharge method for the PD chip provided in the embodiments of the present application are described in detail above. Specific examples are used herein to describe the discharge device for PD chip and the discharge method thereof according to the embodiments of the present application, and the description of the above embodiments is only for helping to understand the core ideas of the present application, and is not intended to limit the present application. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and principles of the invention, which should also fall within the scope of the appended claims.
Claims (25)
1. A discharge device for a PD chip, characterized in that: it comprises the following steps:
a temperature detection circuit for detecting the temperature of the PD chip;
the discharging current selecting module is used for selecting a corresponding discharging current according to the discharging voltage to be discharged by the PD chip; and
and the discharge mode selection module is used for selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip.
2. The discharge apparatus as recited in claim 1, wherein: the discharge current selection module includes:
a plurality of discharge current branches, each of the discharge current branches including a current source for outputting a different discharge current and a current source selection switch connected to the current source; and
And the current source switch control module is used for triggering the current source selection switch in the corresponding discharging current branch to be closed according to the discharging voltage to be discharged by the PD chip so as to output the corresponding discharging current.
3. The discharge apparatus as recited in claim 2, wherein: the higher the discharge voltage to be discharged by the PD chip is, the larger the discharge current selected by the current source switch control module is.
4. The discharge apparatus as recited in claim 1, wherein: further comprises:
and the discharging voltage feedback module is used for detecting the discharging voltage to be discharged of the PD chip and feeding back the detected discharging voltage to be discharged to the discharging current selection module.
5. The discharge apparatus as recited in claim 2, wherein: the discharge mode selection module includes:
a plurality of duty ratio selection switches respectively and correspondingly connected in series in the plurality of discharging current branches;
and the PWM output control module is used for outputting PWM signals with corresponding duty ratios according to the detected temperature of the PD chip and controlling the on and off time of the duty ratio selection switches based on the PWM signals with the corresponding duty ratios.
6. The discharge apparatus as defined in claim 5, wherein: the higher the detected temperature of the PD chip is, the lower the duty ratio of the PWM signal output by the PWM output control module is; the lower the detected temperature of the PD chip is, the higher the duty ratio of the PWM signal output by the PWM output control module is.
7. The discharge apparatus as defined in claim 5, wherein: the discharge mode selection module stores a plurality of different discharge modes which respectively correspond to a plurality of temperature ranges of the PD chip,
wherein the discharge mode selection module selects a corresponding discharge mode based on a temperature range in which the detected temperature of the PD chip falls.
8. The discharge apparatus as recited in claim 7 wherein: the plurality of different discharge modes includes a first discharge mode, a second discharge mode, a third discharge mode, and a fourth discharge mode, wherein,
when the temperature of the PD chip is higher than a preset second over-temperature protection threshold value, the discharging mode selecting module selects the first discharging mode;
when the temperature of the PD chip is higher than a preset first over-temperature protection threshold value but not higher than the second over-temperature protection threshold value, the discharge mode selection module selects the second discharge mode;
when the temperature of the PD chip is higher than a preset high-temperature threshold value but not higher than the first over-temperature protection threshold value, the discharging mode selecting module selects the third discharging mode; and
When the temperature of the PD chip is not higher than the high temperature threshold value, the discharge mode selection module selects the fourth discharge mode,
the second over-temperature protection threshold is larger than the first over-temperature protection threshold, and the first over-temperature protection threshold is larger than the high-temperature threshold.
9. The discharge apparatus as recited in claim 8 wherein: the first discharge mode includes:
immediately turning off the discharge current; alternatively, the discharge is performed with a predetermined minimum discharge current.
10. The discharge apparatus as recited in claim 8 wherein: the second discharge mode is a low discharge mode, which includes:
discharging is performed at a predetermined low percentage of the selected discharge current until the discharge voltage to be discharged by the PD chip is reduced to a predetermined low voltage threshold, and then the discharge current is completely turned off.
11. The discharge apparatus as recited in claim 8 wherein: the third discharge mode is a PWM discharge mode, which includes:
the discharge current selected is controlled to be periodically turned off.
12. The discharge apparatus as recited in claim 11, wherein: the discharge mode selection module is used for controlling the on and off time of a duty ratio selection switch connected in series in a corresponding discharge current branch by outputting PWM signals with different duty ratios so as to control the selected discharge current to be periodically switched on and off.
13. The discharge apparatus as recited in claim 11, wherein: the discharge current in the third discharge mode linearly decreases with an increase in the temperature of the PD chip.
14. The discharge apparatus as recited in claim 13, wherein: the minimum discharge current in the third discharge mode is greater than the discharge current in the second discharge mode.
15. The discharge apparatus as recited in claim 8 wherein: the fourth discharge mode is a high discharge mode, which includes:
and continuously discharging at the selected discharging current.
16. The discharge apparatus as defined in claim 5, wherein: the PWM output control module includes:
a voltage supply module for supplying a corresponding detection voltage according to the detected temperature of the PD chip, wherein the supplied detection voltage increases with the detected temperature of the PD chip; and
A positive input end of the comparator is used for receiving a sawtooth wave signal, a negative input end of the comparator is connected to the voltage supply module and used for receiving the detection voltage,
wherein the comparator is configured to compare the received sawtooth wave signal with the magnitude of the supplied detection voltage and output the PWM signal based on the result of the comparison, wherein the higher the supplied detection voltage is, the smaller the duty ratio of the output PWM signal is; the lower the detection voltage is provided, the larger the duty ratio of the PWM signal is outputted.
17. The discharge apparatus as recited in any one of claims 1 to 16, wherein: the PD chip is provided with an input end and an output end, when the input end of the PD chip needs to discharge voltage, the discharging device is connected to the input end of the PD chip, and the discharging voltage to be discharged by the PD chip comprises the input voltage of the PD chip; when the output end of the PD chip needs to discharge voltage, the discharging device is connected to the output end of the PD chip, and the discharging voltage to be discharged by the PD chip comprises the output voltage of the PD chip.
18. A discharge method for a PD chip, characterized by: it comprises the following steps:
detecting the temperature of the PD chip;
selecting a corresponding discharge current according to a discharge voltage to be discharged by the PD chip; and
and selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip.
19. The discharge method of claim 18, wherein: further comprises:
detecting and feeding back a discharge voltage to be discharged by the PD chip;
and controlling and selecting a corresponding discharge current according to the fed-back discharge voltage to be discharged.
20. The discharge method of claim 18, wherein: the selecting a discharge mode corresponding to the discharge current according to the detected temperature of the PD chip includes:
when the detected temperature of the PD chip is higher than a preset second over-temperature protection threshold value, controlling to select a first discharging mode;
when the detected temperature of the PD chip is higher than a preset first over-temperature protection threshold value but not higher than a second over-temperature protection threshold value, controlling to select a second discharging mode;
when the detected temperature of the PD chip is higher than a preset high-temperature threshold value but not higher than the first over-temperature protection threshold value, controlling to select a third discharging mode; and
When the detected temperature of the PD chip is not higher than the high-temperature threshold value, controlling to select a fourth discharging mode,
the second over-temperature protection threshold is larger than the first over-temperature protection threshold, and the first over-temperature protection threshold is larger than the high-temperature threshold.
21. The discharge method of claim 20, wherein: the controlling to select the first discharge mode includes:
controlling to immediately turn off the discharge current; alternatively, the control is performed to discharge at a predetermined minimum discharge current.
22. The discharge method of claim 20, wherein: the controlling to select the second discharge mode includes:
and controlling to discharge at the selected preset low percentage of the discharge current until the discharge voltage to be discharged by the PD chip is reduced to a preset low voltage threshold value, and then completely closing the discharge current.
23. The discharge method of claim 20, wherein: the controlling to select the third discharge mode includes:
the discharge current selected is controlled to be periodically turned off.
24. The discharge method of claim 23, wherein: the controlling of the selected discharge current to periodically turn off includes:
the on and off times of the selected discharge current are controlled by outputting PWM signals with different duty ratios.
25. The discharge method of claim 20, wherein: the control selecting the fourth discharge mode includes:
and controlling to perform continuous discharge with the selected discharge current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311481861.1A CN117375178A (en) | 2023-11-08 | 2023-11-08 | Discharge device for PD chip and discharge method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311481861.1A CN117375178A (en) | 2023-11-08 | 2023-11-08 | Discharge device for PD chip and discharge method thereof |
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