CN114844340A - Alternating current wake-up circuit and energy storage power supply - Google Patents
Alternating current wake-up circuit and energy storage power supply Download PDFInfo
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- CN114844340A CN114844340A CN202210783342.XA CN202210783342A CN114844340A CN 114844340 A CN114844340 A CN 114844340A CN 202210783342 A CN202210783342 A CN 202210783342A CN 114844340 A CN114844340 A CN 114844340A
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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
- H02M1/36—Means for starting or stopping converters
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to an alternating current wake-up circuit and an energy storage power supply, wherein the alternating current wake-up circuit comprises: the device comprises a half-wave module, a threshold module, an isolation module, a level module and a switch module, wherein the half-wave module is used for being connected with an alternating current power supply, the half-wave module is connected with the threshold module, the isolation module is respectively connected with the threshold module and the level module, the level module is also connected with a control end of the switch module, and the switch module is also used for being connected with a power supply and a device to be awakened; the half-wave module is used for converting an alternating current signal output by the alternating current power supply into a half-wave signal; the threshold module is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is greater than a first threshold; the isolation module is used for outputting a first level signal to the level module according to the half-wave signal; the level module is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened. The invention can activate the device to be awakened when detecting the alternating current signal, and the circuit structure is simpler.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an alternating current wake-up circuit and an energy storage power supply.
Background
With the further overcoming of the technical difficulty of the lithium battery, the energy storage product is developed at a high speed, and particularly, the household energy storage product realizes the integration of light, storage and charging and solves the problem of instability of an electric system, so that the household energy storage product is favored by more and more users. The household energy storage product also relates to working conditions such as AC (Alternating Current) charging, PV (Photovoltaic) charging and the like, wherein the AC charging method mainly comprises two methods, namely, a BMS (Battery Management System) System manually presses a key to start charging, and the AC (Alternating Current) activates the BMS System to charge.
At present, the schemes for enabling the BMS system to be charged by AC are limited, and a common scheme is to design an auxiliary Power Supply (SPS), and generate a BMS system activation signal by using an MCU (micro controller Unit) or other specific circuits after the SPS normally operates by AC, so as to activate the BMS system to be charged. This common scheme can activate the BMS efficiently and reliably, but the circuit design is complicated and the product cost is high.
Disclosure of Invention
The embodiment of the invention provides an alternating current wake-up circuit and an energy storage power supply, which can activate a device to be awakened when an alternating current signal is detected, and have a simpler circuit structure.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: an ac wake-up circuit is provided, the ac wake-up circuit comprising: the device comprises a half-wave module, a threshold module, an isolation module, a level module and a switch module, wherein the half-wave module is used for being connected with an alternating current power supply, the half-wave module is connected with the threshold module, the isolation module is respectively connected with the threshold module and the level module, the level module is also connected with a control end of the switch module, and the switch module is also used for being connected with a power supply and a device to be awakened; the half-wave module is used for receiving an alternating current signal output by the alternating current power supply and converting the alternating current signal into a half-wave signal; the threshold module is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is greater than a first threshold; when the isolation module is conducted, the isolation module is used for outputting a first level signal to the level module according to the half-wave signal; the level module is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened.
Optionally, the half-wave module includes a diode D1 and a diode D2, an anode of the diode D1 is connected to the first end of the ac power signal, a cathode of the diode D1 is connected to the first end of the threshold module, a cathode of the diode D2 is used for connecting to the second end of the ac power source, and an anode of the diode D2 is connected to the threshold module.
Optionally, the ac wake-up circuit further includes a current limiting module, the half-wave module is connected to the threshold module through the current limiting module, and the current limiting module is configured to receive the half-wave signal and limit a current and a voltage of the half-wave signal, so as to protect the threshold module, the isolation module, the level module, and the switch module.
Optionally, the level module is specifically configured to: receiving the first level signal; pulse broadening is carried out on the first level signal to obtain a second level signal, wherein the pulse width of the second level signal is larger than or equal to one period of the alternating current signal; and controlling the switch module to be continuously conducted according to the second level signal so that the power supply activates the device to be awakened.
Optionally, the threshold module includes a voltage dividing unit, a first filtering unit and a first switching unit, the voltage dividing unit is connected to the half-wave module, the first filtering unit and the first switching unit, the first filtering unit is connected to the first switching unit and the half-wave module, and the first switching unit is connected to the voltage dividing unit, the first filtering unit and the isolating module; the voltage division unit is used for limiting the voltage between the input end and the output end of the first filtering unit; the first filtering unit is used for protecting the first switch unit; the first switch unit is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is larger than the first threshold value.
Optionally, the level module includes a charge and discharge unit and a second filtering unit, the charge and discharge unit is connected to the second filtering unit, the isolation module and the switch module, and the second filtering unit is connected to the power supply, the isolation module and the switch module; the charging and discharging unit is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened; the second filtering unit is used for protecting the charging and discharging unit, the isolation module and the switch module.
Optionally, the charge and discharge unit includes a resistor R7, a capacitor C4, and a voltage regulator ZD2, a first end of the resistor R7 is connected to the power supply through the switch module, a second end of the resistor R7 is connected to a cathode of the voltage regulator ZD2 through the isolation module, a second end of the resistor R7 is further connected to a first end of the capacitor C4, and an anode of the voltage regulator ZD2 is connected to a second end of the capacitor C4 and grounded.
Optionally, the switch module includes a transistor Q1, an emitter of the transistor Q1 is connected to the power supply, a base of the transistor Q1 is connected to the level module, and a collector of the transistor Q1 is connected to the device to be wakened.
Optionally, the ac wake-up circuit further includes a filtering module, the filtering module is connected to the half-wave module, the threshold module and the isolation module, and the filtering module is configured to limit current and voltage at an input end of the isolation module, so as to protect the isolation module.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: there is provided a power storage supply comprising an ac wake-up circuit as described above.
Unlike the related art, the present invention provides an ac wake-up circuit, including: the device comprises a half-wave module, a threshold module, an isolation module, a level module and a switch module, wherein the half-wave module is used for being connected with an alternating current power supply, the half-wave module is connected with the threshold module, the isolation module is respectively connected with the threshold module and the level module, the level module is also connected with a control end of the switch module, and the switch module is also used for being connected with a power supply and a device to be awakened; the half-wave module is used for receiving an alternating current signal output by the alternating current power supply and converting the alternating current signal into a half-wave signal; the threshold module is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is greater than a first threshold; when the isolation module is conducted, the isolation module is used for outputting a first level signal to the level module according to the half-wave signal; the level module is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened. Therefore, by the mode, when the alternating current signal is received, the switch module is controlled to be conducted, the power supply is enabled to activate the device to be awakened, and the circuit structure of the scheme is simple.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural diagram of an ac wake-up circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another ac wake-up circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a threshold module in the ac wake-up circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a level module in the ac wake-up circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an ac wake-up circuit according to an embodiment of the present invention;
fig. 6 is a waveform diagram of the ac wake-up circuit according to the embodiment of the present invention during operation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. Additionally, while functional block divisions are performed in the device diagrams, with logical sequences shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than the block divisions in the device diagrams, or the flowcharts.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an ac wake-up circuit 100 according to an embodiment of the present invention.
As shown in fig. 1, the ac wake-up circuit 100 includes: the device comprises a half-wave module 10, a threshold module 20, an isolation module 30, a level module 40 and a switch module 50, wherein the half-wave module 10 is used for being connected with an alternating current power supply 200, the half-wave module 10 is connected with the threshold module 20, the isolation module 30 is respectively connected with the threshold module 20 and the level module 40, the level module 40 is also connected with a control end of the switch module 50, and the switch module 50 is also used for being connected with a power supply 300 and a device 400 to be awakened.
The half-wave module 10 is configured to receive an ac signal output by the ac power supply 200 and convert the ac signal into a half-wave signal. The alternating current signal is usually commercial power, the frequency of the commercial power in various countries in the world is 50Hz and 60Hz, and the distribution of the commercial alternating current voltage is varied from 100V to 380V. Wherein, the half-wave signal is a signal only including the positive half part of the alternating current signal.
The threshold module 20 is used for controlling the isolation module 30 to be conducted when the voltage of the half-wave signal is greater than a first threshold. The size of the first threshold may be changed by changing parameters of components in the threshold module 20, and the first threshold may be 50V, 70V, 100V, or the like.
When the isolation module 30 is turned on, the isolation module 30 is configured to output a first level signal to the level module 40 according to the half-wave signal. The frequency of the first level signal is the same as the alternating current signal. The pulse width of the first level signal is a period in which the voltage of the half-wave signal is greater than a first threshold value within one cycle.
The level module 40 is configured to pulse-widen the first level signal and control the switch module 50 to be turned on, so that the power supply 300 activates the device to be woken 400. The power supply 300 is typically a battery power supply, and the device to be awakened 400 may be a BMS system or other device that can be awakened by the power supply.
The level module 40 is specifically configured to: first, a first level signal is received. Then, the first level signal is pulse-broadened to obtain a second level signal, wherein the pulse width of the second level signal is greater than or equal to one period of the alternating current signal. Finally, the switch module 50 is controlled to be continuously turned on according to the second level signal, so that the power supply 300 activates the device 400 to be awakened. Preferably, the pulse width of the second level signal is widened to a duration of one period of the alternating current signal. Preferably, the pulse width of the second level signal is widened to be greater than or equal to one period duration of the alternating current signal and less than or equal to two period durations of the alternating current signal. Therefore, when the voltage of the input alternating current signal is greater than the first threshold value, the switch module can be effectively ensured to be continuously conducted, and the wake-up circuit can accurately detect the effective input of the alternating current so as to wake up the device to be woken up. For example, the device to be woken is a BMS system of an energy storage power supply.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another ac wake-up circuit according to an embodiment of the invention.
The ac wake-up circuit 100 further includes a current limiting module 60, and the half-wave module 10 is connected to the threshold module 20 through the current limiting module 60.
The current limiting module 60 is used for receiving the half-wave signal and limiting the current and voltage of the half-wave signal so as to protect the threshold module 20, the isolation module 30, the level module 40 and the switch module 50. Since the voltage of the ac signal provided by the ac power supply 200 is large, it is necessary to protect the circuit of the subsequent stage from the high voltage shock through the current limiting module 60.
Optionally, the ac wake-up circuit 100 further includes a filtering module 70, and the filtering module 70 is connected to the half-wave module 10, the threshold module 20, and the isolation module 30 respectively. The filtering module 70 is used to limit the current and voltage at the input of the isolation module 30 to protect the isolation module 30.
The filtering module 70 includes a current limiting unit 701 and a voltage limiting unit 702, the current limiting unit 701 is connected to the current limiting module 60, the voltage limiting unit 702 and the isolation module 30, and the voltage limiting unit 702 is connected to the half-wave module 10 and the threshold module 20.
The current limiting unit 701 is used to limit the current at the input terminal of the isolation module 30. The operation current of the isolation module 30 to which the current limiting unit 701 is connected is small, and thus the current flowing into the isolation module 30 is limited by the current limiting unit 701 to protect the isolation module 30.
The voltage limiting unit 702 is used to limit the voltage at the input of the isolation module 30. The operating voltage of the isolation module 30 to which the voltage limiting unit 702 is connected is also small, and thus the voltage of the input terminal of the isolation module 30 is limited and stabilized by the voltage limiting unit 702 to protect the isolation module 30.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a threshold module 20 in the ac wake-up circuit 100 according to an embodiment of the present invention.
The threshold module 20 includes a voltage dividing unit 201, a first filtering unit 202, and a first switching unit 203. The voltage dividing unit 201 is connected to the half-wave module 10, the first filtering unit 202 and the first switching unit 203, the first filtering unit 202 is connected to the first switching unit 203 and the half-wave module 10, and the first switching unit 203 is connected to the voltage dividing unit 201, the first filtering unit 202 and the isolation module 30.
The voltage dividing unit 201 is used for limiting a voltage between an input terminal and an output terminal of the first filtering unit 202. The first filtering unit 202 is used to protect the first switching unit 203. The first switching unit 203 is used for controlling the isolation module 30 to be conducted when the voltage of the half-wave signal is greater than a first threshold value.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a level module 40 in an ac wake-up circuit 100 according to an embodiment of the present invention.
The level module 40 includes a charging and discharging unit 401 and a second filtering unit 402, the charging and discharging unit 401 is respectively connected to the second filtering unit 402, the isolation module 30 and the switch module 50, and the second filtering unit 402 is respectively connected to the power supply 300, the isolation module 30 and the switch module 50.
The charging and discharging unit 401 is configured to widen the pulse of the first level signal and control the switch module 50 to be turned on, so that the power supply 300 activates the device 400 to be awakened. The second filtering unit 402 is used for protecting the charging and discharging unit 401, the isolation module 30 and the switch module 50.
Referring to fig. 5, fig. 5 is a schematic circuit structure diagram of an ac wake-up circuit according to an embodiment of the present invention.
The half-wave module 10 includes a diode D1 and a diode D2. The anode of the diode D1 is connected to the first terminal of the ac power signal, the cathode of the diode D1 is connected to the first terminal of the threshold module 20, the cathode of the diode D2 is used to connect to the second terminal of the ac power source 200, and the anode of the diode D2 is connected to the threshold module 20.
The diode D1 and the diode D1 together rectify an ac signal output from the ac power supply 200 and convert the ac signal into a half-wave signal.
The current limiting module 60 comprises a resistor R1 and a voltage regulator tube ZD1, a first end of the resistor R1 is connected with the half-wave module 10, a second end of the resistor R1 is connected with a first end of the voltage regulator tube ZD1, and a second end of the voltage regulator tube ZD1 is respectively connected with the threshold module 20.
The resistor R1 is used for limiting the current of the half-wave signal, and the voltage regulator ZD1 is used for limiting the voltage of the half-wave signal.
The current limiting unit 701 of the filtering module 70 includes a resistor R2, a resistor R4, and a resistor R8. The first end of the resistor R2 is connected with the current limiting module 60, the second end of the resistor R2 is connected with the first end of the resistor R4, the second end of the resistor R4 is connected with the first end of the resistor R8 and the voltage limiting unit 702, and the second end of the resistor R8 is connected with the isolation module 30.
The resistor R2, the resistor R4, and the resistor R8 are used to limit the current at the input end of the isolation module 30.
The voltage limiting unit 702 of the filtering module 70 includes a voltage regulator ZD3, a resistor R10, and a capacitor C2. A first end of the voltage regulator ZD3 is connected to the first end of the resistor R10, the first end of the capacitor C2, and the first end of the resistor R8, respectively, and a second end of the voltage regulator ZD3 is connected to the second end of the resistor R10, the second end of the capacitor C2, the half-wave module 10, and the threshold module 20, and is grounded, respectively.
The voltage regulator ZD3 is used to clamp the voltage at the input end of the isolation module 30 to protect the components of the isolation module 30 from being burned out, and the resistor R10 and the capacitor C2 form an RC filter circuit to absorb the high-frequency noise signals at the input end of the isolation module 30.
The voltage dividing unit 201 of the threshold module 20 includes a resistor R3 and a resistor R5. A first end of the resistor R3 is connected to the current limiting module 60, a second end of the resistor R3 is connected to a first end of the resistor R5, and a second end of the resistor R5 is connected to the first filtering unit 202.
The first filtering unit 202 of the threshold module 20 includes a resistor R11 and a capacitor C3. A first end of the resistor R11 is connected to the first end of the capacitor C3, the voltage dividing unit 202 and the first switch unit 203, respectively, and a second end of the resistor R11 is connected to the second end of the capacitor C3, the first switch unit 203 and the half-wave module 10, respectively, and is grounded.
The first switching unit 203 of the threshold module 20 comprises a switching tube ZD 4. A first end of the switch tube ZD4 is connected to the first filter unit 202, a second end of the switch tube ZD4 is connected to the first filter unit 202 and the half-wave module 10, and is grounded, and a third end of the switch tube ZD4 is connected to the isolation module 30. The switching tube ZD4 may adopt a component with model number TL 431.
The on-off between the input end of the isolation module 30 and the ground is controlled by using the negative feedback principle of the switch tube ZD 4. The resistor R3, the resistor R5 and the resistor R11 form a voltage dividing circuit, and the voltage across the resistor R11 is determined by the first end of the switch tube ZD4 (the voltage across the resistor R11 is greater than 2.5V, the second end and the third end of the switch tube ZD4 are connected, and the isolation module 30 can be connected by connecting the current between 1mA and 100 mA) to control the on/off state of the isolation module 30. The voltage V11 across the resistor R11 and the voltage V of the ac electrical signal have a linear relationship, where the relationship is: v11= (V-Vzd1) × R11/(R1+ R3+ R5+ R11), where Vzd1 is the voltage across zener diode ZD1, R11 is the resistance of resistor R11, R1 is the resistance of resistor R1, R3 is the resistance of resistor R3, R5 is the resistance of resistor R5, and R11 is the resistance of resistor R11. The minimum voltage value of the alternating current signal can be changed by changing the parameters of the components in the formula. The minimum voltage value is the voltage value of the ac signal having the lowest voltage for turning on the isolation module 30. That is, when the voltage of the ac electrical signal is lower than the minimum voltage value, the switch ZD4 is not turned on, and then the subsequent isolation module 30 is also not turned on, and the threshold module 20 can avoid activating the device to be wakened up when the voltage of the ac electrical signal is lower than the minimum voltage value. Namely, the threshold module 20 can prevent the device to be awakened from being activated under the abnormal alternating current signal, so as to play a role of protection.
The optical coupler U1 is adopted to insulate one side of an alternating current signal from one side of a power supply, so that the design requirement of safety insulation is met. In practical applications, wide-body optical couplers of different degrees can be used according to the insulation grade.
The charging and discharging unit 401 of the level module 40 includes a resistor R7, a capacitor C4, and a zener diode ZD 2. A first end of the resistor R7 is connected to the power supply 300 through the switch module 50 (a BAT + end in fig. 5 is connected to the power supply), a second end of the resistor R7 is connected to a cathode of the voltage regulator ZD2 through the optocoupler U1, a second end of the resistor R7 is further connected to a first end of the capacitor C4, and an anode of the voltage regulator ZD2 is connected to a second end of the capacitor C4 and grounded.
The second filtering unit 402 of the level module 40 includes a resistor R6 and a capacitor C1, wherein a first end of the resistor R6 is connected to a first end of the capacitor C1 and the switching module 50, and a second end of the resistor R6 is connected to a second end of the capacitor C1, a second end of the resistor R7, and a fourth end of the optocoupler U1.
The switch module 50 includes a transistor Q1, an emitter of the transistor Q1 is connected to the power supply 300, a base of the transistor Q1 is connected to the level module 40, and a collector of the transistor Q1 is connected to the device to be waken 400 (the VCC _ B terminal in fig. 5 is connected to the device to be waken 400). The transistor Q1 in the embodiment of the present invention is a PNP transistor, and other switching devices can be adaptively selected in practical applications.
Optionally, the switch module 50 further includes a resistor R9, a first terminal of the resistor R9 is connected to the collector of the transistor Q1, and a second terminal of the resistor R9 is connected to the second terminal of the capacitor C4 and grounded. The resistor R9 is used to prevent the damage of components due to the excessive current in the circuit.
In the above circuit, when the optical coupler U1 is turned on and sends the first level signal to the level module 40, the level module 40 needs to make the switch Q1 continuously turned on, and the power supply 30 can activate the device 400 to be wakened.
Specifically, firstly, the ac signal is rectified by the half-wave module 10 and then converted into a half-wave signal, and the half-wave signal is judged by the threshold of the threshold module 20 and then the isolation module 30 is turned on. Generally, the period of the alternating current signal is the same as the period of the half-wave signal. Then, the third terminal and the fourth terminal of the optical coupler U1 of the isolation module 30 output a first level signal, and the pulse width of the first level signal is a part of the half-wave signal that is greater than the first threshold, i.e. the pulse width of the first level signal is less than half of the alternating current signal. Then, the level module 40 converts the first level signal into a second level signal, and the pulse width of the second level signal is greater than one period of the alternating current signal. Then, the level module 40 transmits the second level signal to the transistor Q1, and the current flows from the emitter of the transistor Q1 to the base of the transistor Q1, so that the conduction states of the emitter of the transistor Q1 and the collector of the transistor Q1 can be controlled.
In practical application, in order to apply the power supply 300 with different voltages, the voltage regulator ZD2 is designed, and according to the KVL principle (kirchhoff voltage law), there are Vc4= Vzd2+ Vu (3, 4), where Vc4 is the voltage value across the capacitor C4, Vzd2 is the voltage value across the voltage regulator ZD2, and Vu (3, 4) is the voltage value between the third terminal and the fourth terminal of the optocoupler U1. When the voltage of the power supply 300 is higher, the surge current flowing between the third end and the fourth end of the optocoupler U1 can be limited by selecting the voltage regulator tube ZD2 with reasonable component parameters, so that the protection effect is achieved.
To better understand the process of converting the first level signal into the second level signal by the level module 40, please refer to fig. 6, and fig. 6 is a waveform diagram of the ac wake-up circuit according to the embodiment of the present invention when operating. In fig. 6, the horizontal axis t represents time and the unit is s. The vertical axis y in fig. 6 represents voltage in units of V.
As shown in fig. 6, the uppermost waveform in fig. 6 is a waveform diagram of an ac electric signal, and a value a where a dotted line in the waveform diagram of the ac electric signal is located is a first threshold value. The middle waveform of fig. 6 is a waveform diagram of the voltage between the third terminal and the second terminal of the switching tube ZD 4. Ton in fig. 6 refers to the time when the switching tube ZD4 is turned on, i.e. the pulse width of the first level signal. The lowermost waveform in fig. 6 is a waveform of the voltage across the capacitor C4. As can be seen from fig. 6, in each cycle of the ac signal, the capacitor C4 is discharged during Ton and is charged outside Ton.
Specifically, the slow charging and fast discharging circuit is composed of an optical coupler U1, a voltage regulator tube ZD2, a resistor R7 and a capacitor C4. The slow and fast in the slow charge and fast discharge circuit described above are relative terms and do not constitute a specific time limit.
During each cycle of the ac signal, when the optocoupler U1 is turned on, the emitter and collector of transistor Q1 are turned on, and the capacitor C4 discharges quickly. At this time, the power of the power supply 400 is transmitted from the emitter of the transistor Q1, to the base of the transistor Q1, to the resistor R7, to the fourth terminal of the optocoupler U1, to the third terminal of the optocoupler U1, and to the voltage regulator ZD 2. Therefore, the transistor Q1 is turned on between the emitter and the collector, i.e., between the power supply 400 and the device 400 to be woken up. Meanwhile, the electric quantity of the capacitor C4 is rapidly discharged from the fourth end of the optocoupler U1 to the third end of the optocoupler U1 through the voltage stabilizing tube ZD 2.
During each cycle of the ac signal, when the optocoupler U1 is turned off, the emitter and collector of transistor Q1 are turned on, and the capacitor C4 charges more slowly. At this time, the power of the power supply 400 passes through the emitter of the transistor Q1, to the base of the transistor Q1, to the resistor R7, and to the capacitor C4. During the charging process of the capacitor C4, the emitter and the collector of the transistor Q1 are conducted, i.e., the power supply 400 and the device 400 to be wakened are conducted.
It should be noted that, in order to keep the emitter and the collector of the transistor Q1 continuously conducting when the optocoupler U1 is turned off in each cycle of the ac signal, the charging time of the capacitor C4 needs to be set to be longer than one cycle of the ac signal, for example, the charging time of the capacitor C4 is longer than 16.67ms (60 Hz) or the charging time of the capacitor C4 is longer than 20ms (50 Hz). The minimum value of the voltage across the capacitor C4 can be determined by the breakdown point of the zener diode ZD 2. According to the voltage of the power supply 300, the period of the alternating current signal and the first threshold value, the complete work of the slow charging and fast discharging circuit can be realized by selecting components with proper parameters.
An embodiment of the present invention provides an ac wake-up circuit 100, where the ac wake-up circuit 100 includes: the circuit comprises a half-wave module 10, a current limiting module 60, a filtering module 70, a threshold module 20, an isolation module 30, a level module 40 and a switch module 50. The half-wave module 10 is used for converting an alternating current signal output by an alternating current power supply into a half-wave signal. The current limiting module 60 is used for receiving the half-wave signal and limiting the current and voltage of the half-wave signal so as to protect the threshold module 20, the isolation module 30, the level module 40 and the switch module 50. The filtering module 70 is used to limit the current and voltage at the input of the isolation module 30 to protect the isolation module 30. The threshold module 20 is used for controlling the isolation module 30 to be conducted when the voltage of the half-wave signal is greater than a first threshold. The isolation module 30 is configured to output a first level signal to the level module 40 according to the half-wave signal. The level module 40 is configured to pulse-widen the first level signal and control the switch module 50 to be turned on, so that the power supply 300 activates the device to be woken 400. The embodiment of the invention can effectively realize the function of activating the device to be awakened by the alternating current signal, can avoid the activation of the device to be awakened under the abnormal alternating current signal, and has simpler circuit so as to effectively control the product cost.
The embodiment of the present invention provides an energy storage power supply, which includes the ac wake-up circuit 100 as described above. The energy storage power source is respectively connected with the ac power source 200, the power supply 300 and the device 400 to be awakened. The energy storage power supply is used for controlling the power supply 300 to be conducted with the device 400 to be awakened so as to activate the device 400 to be awakened when the alternating current power supply 200 inputs an alternating current signal. In one embodiment, the switch module is used to connect to a wake-up terminal of the BMS system, that is, the device to be woken up is the BMS system, so as to wake up the BMS system.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An ac wake-up circuit, comprising: the device comprises a half-wave module, a threshold module, an isolation module, a level module and a switch module, wherein the half-wave module is used for being connected with an alternating current power supply, the half-wave module is connected with the threshold module, the isolation module is respectively connected with the threshold module and the level module, the level module is also connected with a control end of the switch module, and the switch module is also used for being connected with a power supply and a device to be awakened;
the half-wave module is used for receiving an alternating current signal output by the alternating current power supply and converting the alternating current signal into a half-wave signal;
the threshold module is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is greater than a first threshold;
when the isolation module is conducted, the isolation module is used for outputting a first level signal to the level module according to the half-wave signal;
the level module is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened.
2. An AC wake-up circuit according to claim 1, characterized in that the half-wave module comprises a diode D1 and a diode D2,
the anode of the diode D1 is connected to the first terminal of the ac power signal, the cathode of the diode D1 is connected to the first terminal of the threshold module, the cathode of the diode D2 is used to connect to the second terminal of the ac power source, and the anode of the diode D2 is connected to the threshold module.
3. The ac wake-up circuit of claim 1, further comprising a current limiting module, wherein the half-wave module is connected to the threshold module through the current limiting module, and wherein the current limiting module is configured to receive the half-wave signal and limit a current and a voltage of the half-wave signal to protect the threshold module, the isolation module, the level module and the switch module.
4. An ac wake-up circuit according to claim 1, wherein the level module is specifically configured to:
receiving the first level signal;
pulse broadening is carried out on the first level signal to obtain a second level signal, wherein the pulse width of the second level signal is larger than or equal to one period of the alternating current signal;
and controlling the switch module to be continuously conducted according to the second level signal so that the power supply activates the device to be awakened.
5. The AC wake-up circuit according to claim 1, wherein the threshold module comprises a voltage divider, a first filter and a first switch,
the voltage dividing unit is respectively connected with the half-wave module, the first filtering unit and the first switch unit, the first filtering unit is respectively connected with the first switch unit and the half-wave module, and the first switch unit is respectively connected with the voltage dividing unit, the first filtering unit and the isolation module;
the voltage division unit is used for limiting the voltage between the input end and the output end of the first filtering unit;
the first filtering unit is used for protecting the first switch unit;
the first switch unit is used for controlling the isolation module to be conducted when the voltage of the half-wave signal is larger than the first threshold value.
6. The AC wake-up circuit according to claim 1, wherein the level module comprises a charge/discharge unit and a second filtering unit, the charge/discharge unit is respectively connected to the second filtering unit, the isolation module and the switch module, and the second filtering unit is respectively connected to the power supply, the isolation module and the switch module;
the charging and discharging unit is used for pulse broadening of the first level signal and controlling the switch module to be conducted so that the power supply activates the device to be awakened;
the second filtering unit is used for protecting the charging and discharging unit, the isolation module and the switch module.
7. The AC wake-up circuit according to claim 6, wherein the charge/discharge unit comprises a resistor R7, a capacitor C4 and a voltage regulator ZD2,
the first end of the resistor R7 is connected with the power supply through the switch module, the second end of the resistor R7 is connected with the cathode of the voltage regulator tube ZD2 through the isolation module, the second end of the resistor R7 is also connected with the first end of the capacitor C4, and the anode of the voltage regulator tube ZD2 is connected with the second end of the capacitor C4 and grounded.
8. The ac wake-up circuit of claim 1, wherein the switching module comprises a transistor Q1, an emitter of the transistor Q1 is connected to the power supply, a base of the transistor Q1 is connected to the level module, and a collector of the transistor Q1 is connected to the device to be woken up.
9. The AC wake-up circuit according to any one of claims 1 to 8, further comprising a filtering module respectively connected to the half-wave module, the threshold module and the isolation module,
the filtering module is used for limiting the current and the voltage of the input end of the isolation module so as to protect the isolation module.
10. A power supply with stored energy, characterized in that it comprises an ac wake-up circuit according to any of claims 1 to 9.
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| CN114844340B (en) | 2022-09-20 |
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