CN113612395B - Auxiliary power supply circuit with ultralow standby power consumption - Google Patents
Auxiliary power supply circuit with ultralow standby power consumption Download PDFInfo
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- CN113612395B CN113612395B CN202111041116.6A CN202111041116A CN113612395B CN 113612395 B CN113612395 B CN 113612395B CN 202111041116 A CN202111041116 A CN 202111041116A CN 113612395 B CN113612395 B CN 113612395B
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to an auxiliary power supply circuit with ultralow standby power consumption, which comprises a transformer, a PWM control chip, a battery power supply, a first switching tube, a voltage division adjusting module, an adjusting module and a control module. And calculating the minimum insufficient voltage of the battery. The control module selects a battery brownout voltage based on the battery minimum brownout voltage and the battery supply voltage. Adjusting module parameters of the adjusting module to enable the power supply time of the control module to maintain the power-down of the power supply voltage of the PWM control chip; when the auxiliary power supply circuit works, the control module collects input voltage and controls the discharging speed of the power supply voltage when the input voltage is lower than the insufficient voltage of the battery. And after the discharging is finished, the PWM control chip and the control module are powered down. After power failure, the auxiliary power circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage. Therefore, the auxiliary power supply circuit can be prevented from being continuously self-started, the standby power consumption of the system is really reduced, and the current loss is greatly reduced.
Description
Technical Field
The invention relates to the field of power supplies, in particular to an auxiliary power supply circuit with ultralow standby power consumption.
Background
In a normal power supply system, the main power circuit stops operating in a standby state, but the auxiliary power circuit continues to operate until the battery voltage further decreases to a point where the auxiliary power supply cannot maintain normal operation. At this point the system will enter a "power down standby" state. A typical example of an existing auxiliary power supply circuit is shown in fig. 1. The PWM control chip U1's among the auxiliary power supply circuit operating voltage generally has two kinds, minimum normal starting voltage VCC2, and shutdown voltage VCC1 after normal work, chip factory usually can design a threshold voltage difference for VCC2> VCC 1. The operation of the PWM control chip U1 can be referred to in fig. 2.
The conventional auxiliary power supply circuit has the following drawbacks. As long as the battery voltage input by the auxiliary power supply is greater than the lowest normal start voltage VCC2 of the PWM control chip U1, the PWM control chip U1 starts to start even if the battery voltage at this time does not allow the auxiliary power supply circuit to operate normally. In the whole auxiliary power supply circuit, the PWM control chip U1 is also continuously and frequently started (commonly called hiccup). The battery can be powered by starting once, and energy is consumed once through the external MOS tube and the transformer switch. The PWM control chip U1 consumes 12mA of current by itself when operating, but the battery exciting current through the MOS transistor and the transformer is usually several amperes. And this state continues, causing the battery, which is originally in a low state of charge, to run short of further, reducing the life of the battery. The battery may be directly scrapped if the power shortage time is too long.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an auxiliary power circuit with ultra-low standby power consumption, which can prevent the auxiliary power circuit from being turned off and then being turned on again frequently, thereby reducing the standby power consumption of the system, and can suppress the battery current from forming a loop through a transformer and a MOS transistor, thereby greatly reducing the current loss.
The invention adopts the technical scheme that an auxiliary power supply circuit with ultra-low standby power consumption is constructed, and comprises a transformer, a PWM control chip arranged on the primary side of the transformer, a battery power supply, a first switching tube and an output module arranged on the secondary side of the transformer,
further comprising: the device comprises a partial pressure adjusting module, a first adjusting module, a second adjusting module and a control module;
the first end of the voltage division adjusting module is connected with the battery power supply to receive input voltage, the second end of the voltage division adjusting module is grounded, and the third end of the voltage division adjusting module is connected with the voltage end of the PWM control chip;
the first end of the first regulating module is connected with the voltage end of the PWM control chip, the second end of the first regulating module is connected with the primary coil of the transformer, and the third end of the first regulating module is grounded;
the first end of the second regulating module is connected with the secondary coil of the transformer, the second end of the second regulating module is connected with the first end of the control module and the feedback control end of the PWM control chip, and the third end of the second regulating module is grounded;
the second end of the control module is connected with the battery power supply, the third end of the control module is grounded, and the fourth end of the control module is connected with the voltage end of the PWM control chip;
calculating a minimum insufficient voltage of a battery based on the minimum starting voltage and the shutdown voltage of the PWM control chip and module parameters of the voltage division adjusting module, wherein the control module selects the minimum insufficient voltage of the battery based on the minimum insufficient voltage of the battery and a power voltage of the battery;
adjusting module parameters of the first adjusting module and the second adjusting module to enable the power supply time of the control module to maintain the power-down of the power supply voltage of the PWM control chip;
when the auxiliary power supply circuit works, the control module collects the input voltage and controls the discharging speed of the power supply voltage when the input voltage is lower than the voltage of the battery with insufficient voltage, and after discharging is finished, the PWM control chip and the control module are powered down;
after the input voltage is reduced to the battery power-lack voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip.
In the auxiliary power circuit with ultra-low standby power consumption, the voltage division adjusting module comprises a first resistor, a second resistor and a first diode, the first resistor and the second resistor are connected between the input voltage and the ground in series, the cathode of the first diode is connected with the voltage division connection point of the first resistor and the second resistor, and the anode of the first diode is grounded, and the voltage division connection point outputs the supply voltage of the PWM control chip to the voltage end of the PWM control chip;
and setting the resistance values of the first resistor and the second resistor, and calculating the minimum insufficient voltage of the battery based on the resistance value, the minimum starting voltage of the PWM control chip and the shutdown voltage.
In the auxiliary power supply circuit with ultra-low standby power consumption, the first regulating module comprises a second diode and a first capacitor, wherein the anode of the second diode is connected with the primary coil of the transformer, the cathode of the second diode is connected with the voltage end of the PWM control chip and the first end of the first capacitor, and the second end of the first capacitor is grounded.
In the auxiliary power supply circuit with ultra-low standby power consumption, the second regulating module comprises a third diode and a second capacitor, wherein the anode of the third diode is connected with the secondary coil of the transformer, the cathode of the third diode is connected with the first end of the control module and the first end of the second capacitor, and the second end of the second capacitor is grounded;
the capacitance values of the first capacitor and the second capacitor are adjustable so that the power supply time of the control module can maintain the power-down of the power supply voltage of the PWM control chip.
In the auxiliary power supply circuit with ultra-low standby power consumption, the control module comprises an MCU, a third resistor, a fourth resistor and a second switching tube, wherein the voltage end of the MCU is connected with the second end of the second regulating module, the output end of the MCU is connected with the first end of the second switching tube through the third resistor, the second end of the second switching tube is connected with the voltage end of the PWM control chip through the fourth resistor, the third end of the second switching tube is grounded, and the data acquisition end of the MCU is connected with the battery power supply;
the MCU collects the input voltage through the data collection end, and sends a shutdown instruction through the output end and adjusts the fourth resistor to adjust the discharge speed of the power supply voltage when the input voltage is lower than the voltage of the insufficient battery.
In the auxiliary power circuit with ultra-low standby power consumption, the control module further comprises a fifth resistor and a sixth resistor, and the data acquisition end of the MCU is grounded through the sixth resistor and is connected with the battery power supply through the fifth resistor.
In the auxiliary power supply circuit with ultra-low standby power consumption, the MCU is further used for regulating the voltage of the battery at low power.
The invention solves the technical problem by adopting another technical scheme that an auxiliary power supply circuit with ultralow standby power consumption is constructed, and comprises a transformer, a PWM control chip arranged on the primary side of the transformer, a battery power supply, a first switching tube, a voltage division adjusting module, an adjusting module and a control module;
the voltage division adjusting module comprises a first resistor, a second resistor and a first diode, wherein the first resistor and the second resistor are connected between input voltage and ground in series, the cathode of the first diode is connected with a voltage division connecting point of the first resistor and the second resistor, and the anode of the first diode is grounded;
the adjusting module comprises a second diode, a first capacitor, a third diode and a second capacitor, wherein the anode of the second diode is connected with the primary coil of the transformer, the cathode of the second diode is connected with the voltage end of the PWM control chip and the first end of the first capacitor, the second end of the first capacitor is grounded, the anode of the third diode is connected with the secondary coil of the transformer, the cathode of the third diode is connected with the first end of the second capacitor, and the second end of the second capacitor is grounded;
the control module comprises an MCU, a third resistor, a fourth resistor and a second switch tube, wherein the voltage end of the MCU is connected with the cathode of the third diode and the feedback control end of the PWM control chip, the output end of the MCU is connected with the first end of the second switch tube through the third resistor, the second end of the second switch tube is connected with the voltage end of the PWM control chip through the fourth resistor, the third end of the second switch tube is grounded, and the data acquisition end of the MCU is connected with the battery power supply;
setting resistance values of the first resistor and the second resistor, and calculating the minimum insufficient voltage of the battery based on the resistance values, the minimum starting voltage of the PWM control chip and the shutdown voltage;
the MCU selects a battery power-down voltage based on the battery minimum power-down voltage and a battery power supply voltage; the capacitance values of the first capacitor and the second capacitor are adjustable, so that the power supply time of the MCU can be maintained until the power supply voltage of the PWM control chip is powered down;
the MCU acquires the input voltage through the data acquisition end, sends a shutdown instruction through the output end when the input voltage is lower than the battery power-shortage voltage, adjusts the fourth resistor to adjust the discharge speed of the power supply voltage, and after the discharge is finished, the PWM control chip and the MCU are powered down;
after the input voltage is reduced to the battery power-lack voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip.
The auxiliary power supply circuit with ultra-low standby power consumption further comprises a fifth resistor and a sixth resistor, wherein the data acquisition end of the MCU is grounded through the sixth resistor and is connected with the battery power supply through the fifth resistor.
In the auxiliary power supply circuit with ultra-low standby power consumption, the MCU is further used for regulating the voltage of the battery at low power.
By implementing the auxiliary power supply circuit with ultralow standby power consumption, the auxiliary power supply circuit is not frequently self-started after being closed, so that the standby power consumption of the system is really reduced, a loop formed by a transformer and an MOS (metal oxide semiconductor) tube through a battery current can be inhibited, the current loss is greatly reduced, and the insufficient voltage of the battery can be flexibly adjusted.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a prior art auxiliary power supply circuit;
FIG. 2 is a schematic diagram of the operation of the auxiliary power supply circuit shown in FIG. 1;
FIG. 3 is a functional block diagram of an auxiliary power supply circuit with ultra-low standby power consumption in accordance with a preferred embodiment of the present invention;
fig. 4 is a circuit schematic of the auxiliary power supply circuit of ultra-low standby power consumption of the preferred embodiment of the present invention.
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.
Fig. 3 is a functional block diagram of an auxiliary power supply circuit with ultra-low standby power consumption in accordance with a preferred embodiment of the present invention. As shown in fig. 3, the auxiliary power circuit with ultra-low standby power consumption of the present invention includes a transformer T1, a PWM control chip U1 disposed on the primary side of the transformer T1, a battery power supply and a switching tube Q2, and an output module 500, a voltage division adjusting module 100, a first adjusting module 200, a second adjusting module 300 and a control module 400 disposed on the secondary side of the transformer T1.
In the present invention, the transformer T1, the PWM controller U1, the battery power supply, the switch Q2 and the output module 500 may be constructed with reference to any suitable prior art construction, such as the corresponding components of the auxiliary power circuit shown in fig. 1, and will not be described again.
As further shown in fig. 3, the first terminal of the voltage division adjusting module 100 is connected to a battery power source to receive an input voltage, the second terminal is grounded, and the third terminal is connected to the voltage terminal of the PWM control chip U1. The first end of the first regulation module 200 is connected to the voltage end of the PWM control chip U1, the second end is connected to the primary coil of the transformer T1, and the third end is grounded. The first end of the second regulating module 300 is connected to the secondary winding of the transformer T1, the second end is connected to the first end of the control module 400 and the feedback control end of the PWM control chip U1, and the third end is grounded. The second terminal of the control module 400 is connected to the third terminal of the battery power supply and the fourth terminal is connected to the voltage terminal of the PWM control chip.
In the preferred embodiment, the minimum battery shortage voltage may be calculated based on the minimum start-up voltage and the shutdown voltage of the PWM control chip U1 and the module parameters of the voltage division adjusting module 100. The control module selects a battery brownout voltage based on the battery minimum brownout voltage and a battery supply voltage. Namely, any voltage is selected as the battery insufficient voltage in the range of the battery minimum insufficient voltage and the battery power voltage, so that the battery insufficient voltage is flexibly adjusted.
Adjusting the module parameters of the first and second adjusting modules 200 and 300 to enable the supply time of the control module 400 to maintain the supply voltage to the PWM control chip U1 powered down. When the auxiliary power supply circuit works, the control module 400 collects the input voltage, controls the discharging speed of the power supply voltage when the input voltage is lower than the battery power-shortage voltage, and after the discharging is finished, the PWM control chip U1 and the control module 400 are powered off; after the input voltage is reduced to the battery power-down voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip U1.
Through the arrangement, the auxiliary power supply circuit is not frequently started again after being closed, so that the standby power consumption of the system is really reduced, a loop formed by the battery current through the transformer and the MOS tube can be inhibited, the current loss is greatly reduced, and the insufficient voltage of the battery can be flexibly adjusted.
In a preferred embodiment of the present invention, the voltage dividing and adjusting module 100 may employ any suitable voltage dividing circuit, and for example, may include a first resistor, a second resistor, and a first diode, where the first resistor and the second resistor are connected in series between the input voltage and the ground, a cathode of the first diode is connected to a voltage dividing connection point of the first resistor and the second resistor, and an anode of the first diode is connected to the ground, and the voltage dividing connection point outputs the supply voltage of the PWM control chip U1 to the voltage terminal of the PWM control chip U1. In other preferred embodiments of the present invention, the first resistor may be divided into two or more resistors. The minimum insufficient voltage of the battery is calculated by setting the resistance values of the first resistor and the second resistor and based on the resistance values, the lowest starting voltage of the PWM control chip U1 and the shutdown voltage.
In a preferred embodiment of the present invention, the first regulating module 200 includes a second diode and a first capacitor, an anode of the second diode is connected to the primary winding of the transformer T1, a cathode of the second diode is connected to the voltage terminal of the PWM control chip U1 and the first terminal of the first capacitor, and a second terminal of the first capacitor is grounded. The second regulating module 300 includes a third diode and a second capacitor, an anode of the third diode is connected to the secondary winding of the transformer T1, a cathode of the third diode is connected to the first terminal of the control module 400 and the first terminal of the second capacitor, and a second terminal of the second capacitor is grounded. The capacitance values of the first capacitor and the second capacitor are adjustable so that the power supply time of the control module 400 can maintain the power supply voltage to the PWM control chip U1 to be powered down.
In a preferred embodiment of the present invention, the control module 400 includes an MCU, a third resistor, a fourth resistor, and a second switching tube, a voltage end of the MCU is connected to the second end of the second adjusting module 300, an output end of the MCU is connected to the first end of the second switching tube through the third resistor, the second end of the second switching tube is connected to the voltage end of the PWM control chip U1 through the fourth resistor, a third end of the second switching tube is grounded, and a data collecting end of the MCU is connected to the battery power supply. The MCU collects the input voltage through the data collection end, and sends a shutdown instruction through the output end and adjusts the fourth resistor to adjust the discharge speed of the power supply voltage when the input voltage is lower than the voltage of the insufficient battery.
In a further preferred embodiment of the present invention, in order to better collect the input voltage, the control module further includes a sixth resistor and a fifth resistor, and the data collection end of the MCU is grounded via the sixth resistor and connected to the battery power supply via the fifth resistor. The MCU is further used for reading the battery voltage of the battery power supply through the data acquisition end and flexibly adjusting the insufficient voltage of the battery.
Fig. 4 is a circuit schematic of the auxiliary power supply circuit of ultra-low standby power consumption of the preferred embodiment of the present invention. As shown in fig. 4, the auxiliary power circuit with ultra-low standby power consumption of the present invention includes a transformer T1, a PWM control chip U1 disposed on the primary side of the transformer T1, a battery power supply and a switch Q2, a voltage division adjusting module, an adjusting module, and a control module. In other preferred embodiments of the present invention, the adjusting module may also be divided into a first adjusting module and a second adjusting module.
As further shown IN fig. 4, the voltage division adjusting module includes a resistor R1, a resistor R2, and a diode DZ1, the resistor R1 and the resistor R2 are connected IN series between the battery power source and the ground GND to receive the input voltage V-IN, and the cathode of the diode DZ1 is connected to the voltage division connection point of the resistor R1 and the resistor R2, and the anode is connected to the ground GND. In a preferred embodiment of the invention, the diode DZ1 is a zener diode. The voltage dividing connection point outputs the power supply voltage of the PWM control chip U1 to a voltage terminal VCC of the PWM control chip U1. Because the input voltage V-IN of battery power, after resistance R1 and resistance R2 partial pressure, output PWM control chip U1's supply voltage arrives PWM control chip U1's voltage end VCC, consequently set up resistance R1 with the resistance of resistance R2, and based on the resistance, PWM control chip U1's minimum starting voltage and shutdown voltage can calculate the minimum insufficient voltage of battery. The provision of the diode DZ1 may implement a voltage clamping function.
The UC3844B is adopted as a PWM control chip U1, and 100 lithium iron phosphate batteries are adopted as a battery power supply, which is specifically described as follows.
As can be seen from the specification of UC3844B, the minimum startup voltage VCC2=16V and the shutdown voltage VCC1=10V in UC 3844B. According to the specification of the lithium iron phosphate battery, the nominal voltage of each lithium iron phosphate battery is 3.2V, and the lower limit voltage of discharge is 2.2V-2.5V. Firstly, setting the resistance value of the resistor R2 to be R2=10K Ω, then ensuring that the normal 320V auxiliary power supply circuit of 100 lithium iron phosphate batteries can be started, that is, the supply voltage received by the PWM control chip U1 (UC 3844B) from the voltage division connection point is greater than or equal to the minimum starting voltage VCC2, that is, the supply voltage > =16V needs to be ensured. According to the partial pressure formula: 320V × R2/(R1+ R2) =16V, i.e., R1< =190K Ω can be derived.
After obtaining the resistance values of the resistors R1 and R2, it is known that R1=190K Ω, R2=10K Ω, and the shutdown voltage VCC1= 10V. Then the minimum brownout voltage V-IN _ min =200V of the battery at which the auxiliary power supply circuit enters the brownout standby state can be derived from the formula V-IN _ min R2/(R1+ R2) = 10V. Therefore, the battery insufficient voltage of the auxiliary power supply circuit entering the insufficient standby state can be flexibly set within the range of 200-320V, and the insufficient sleep state of the auxiliary power supply circuit can be flexibly set by flexibly selecting the battery insufficient voltage within the range.
As further shown in fig. 3, the adjusting module includes a diode D1, a capacitor C1, a diode D2, and a capacitor C2, an anode of the diode D1 is connected to the primary winding of the transformer, a cathode of the diode D1 is connected to the voltage terminal VCC of the PWM control chip U1 and the first end of the capacitor C1, a second end of the capacitor C1 is grounded to GND, an anode of the diode D2 is connected to the secondary winding of the transformer, a cathode of the diode D2 is connected to the first end of the capacitor C2, and a second end of the capacitor C2 is grounded to GND.
The control module comprises an MCU U2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a switch tube Q1, wherein the voltage end of the MCU U2 is connected with the cathode of the diode D2 and is connected with the feedback control end FB of the PWM control chip U1 through a resistor R7, the output end IO is connected with the first end of the switch tube Q1 through the resistor R3, the second end of the switch tube Q1 is connected with the voltage end of the PWM control chip U1 and the third end of the switch tube Q1 through the resistor R4 and is grounded GND, and the data acquisition end ADC of the MCU U2 is grounded through the resistor R6 and is connected with the battery power supply through the resistor R5. In a preferred embodiment of the present invention, the switching transistor Q1 is preferably a MOS transistor, and has a gate connected to the resistor R3, a source connected to ground, and a drain connected to the voltage terminal of the PWM control chip U1 through a resistor R4.
The capacitance values of the capacitor C1 and the capacitor C2 are adjustable so that the power supply time of the MCU U2 can maintain the power-down of the power supply voltage of the PWM control chip U1.
Assuming that the normal output voltage of the diode D2 is 5V and the under-voltage shutdown voltage of the MCU U2 is 2.7V, and assuming that the current flowing through the diode D2 is I2, the power supply time t2 of the MCU U2 can be derived from the following formula:
W=PT
W=（1/2）*C*U*U
P=UI
where P denotes power, T denotes time, C denotes capacitance, U denotes voltage, and I denotes current value.
Therefore, the electrical power W = (1/2) × C2 × 5 × (1/2) × C2 × 2.7= P2 × t2 of the diode D2.
The value of the power supply time t2 of the MCU U2 can be adjusted by adjusting the capacitance value of the capacitor C2 through detecting the output voltage of the diode D2 and the current I2.
Since the voltage terminal of the PWM control chip U1 is grounded via the capacitor C1 and grounded via the resistor R4 and the switch Q1, respectively, the power-down time t1 of the PWM control chip U1 is determined by the discharge time parameters of the capacitor C1 and the resistor R4, and is approximately obtained by the following formula: t1 ≈ C1 ≈ R4.
Therefore, the power-down time t1 of the PWM control chip U1 can be adjusted by adjusting the capacitance value of the capacitor C1. Therefore, the fact that the capacitance values of the capacitors C1 and C2 are adjusted to meet the condition that t2> t1 enables the power supply time of the MCU U2 to be maintained until the power supply voltage of the PWM control chip U1 is powered down can be achieved.
In another preferred embodiment of the present invention, the power-down time t1 and the power-supply time t2 can be directly detected by an oscilloscope, and if it is found that it does not satisfy t2> t1, the capacitance values of the capacitors C1 and C2 are adjusted until it satisfies t2> t 1.
When auxiliary power source during operation, MCU U2 passes through data acquisition end ADC gathers input voltage, and be in input voltage is less than when the battery insufficient voltage through output IO sends the shutdown instruction and adjusts resistance R4 is in order to adjust power supply voltage's discharge speed.
Because when auxiliary power source during operation, MCU U2 can be through the input voltage of data acquisition end ADC sampling battery power, when battery input voltage is less than during the battery insufficient voltage, MCU U2 sends a shutdown command through its output IO. As can be seen from the foregoing, the battery power-down voltage can be selectively set between the aforementioned exemplary minimum battery power-down voltage of 200V and the battery power voltage of 320V. At this time, when the voltage is lower than 200V, the auxiliary power supply circuit is powered down and stopped, and when the voltage is higher than 320V, even if the MCU gives a shutdown command, the auxiliary power supply circuit is started again after shutdown.
As mentioned above, since the voltage terminal of the PWM control chip U1 is grounded via the capacitor C1 and the resistor R4 and the switch Q1, respectively, the power-down time t1 of the PWM control chip U1 is determined by the discharge time parameters of the capacitor C1 and the resistor R4, and is approximately obtained by the following formula: t1 ≈ C1 ≈ R4. Therefore, the power-down time t1 of the PWM control chip U1, i.e., the discharging speed of the power supply voltage of the PWM control chip U1, can be adjusted by adjusting the resistance value of the resistor R4. At this time, the adjusting resistor R4 also serves to prevent the discharge current from being too large, and to protect the switching tube Q1.
After the discharging of the switching tube Q1 is finished, the PWM control chip U1 and the MCU U2 are powered down. After the discharging of the switching tube Q1 is finished, the PWM control chip U1 enters a power-down sleep stage, and when the power consumption of the capacitor C2 is finished, the MCU U2 also stops working due to power-down. The entire system no longer consumes energy. At this moment, the power consumption of the PWM control chip U1 is reduced from 12mA to 2uA, the whole auxiliary power supply circuit is not frequently started, and the energy consumption of a multi-ampere loop generated when the battery current passes through the transformer and the switching tube Q2 is avoided.
After the input voltage is reduced to the battery power-down voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip U1. Since the battery power supply is actually still powered after the auxiliary power circuit, i.e., the battery power supply, is powered down, but the auxiliary power circuit cannot be started, i.e., the supply voltage of the PWM control chip U1 will be lower than its lowest startup voltage VCC2, e.g., 16V as previously described, after the output voltage of the battery power supply (i.e., the input voltage as shown) has dropped to the battery power-down voltage of the aforementioned setting, the PWM control chip U1 will not make frequent startup attempts. Until the battery power supply is charged, the input voltage is higher than the battery power-lack voltage set as above, and the supply voltage of the PWM control chip U1 is higher than the minimum startup voltage VCC2, that is, in the power-up process shown in fig. 2, the voltage curve is greater than VCC2, and the auxiliary power supply circuit does not start to operate.
According to the invention, the input power supply voltage of the PWM control chip U1 is adjustable by arranging the voltage division adjusting module, and the MCU can conveniently close the PWM control chip by sending a turn-off signal through the combined control of the MCU and the PWM control chip U1, so that the auxiliary power supply circuit is completely turned off. The PWM control chip U1 cannot self-start itself frequently as long as the input voltage does not satisfy the battery power-down voltage higher than the aforementioned setting. Furthermore, by debugging the capacitance values of the capacitors C1 and C2 in reasonable proportion, the power-off delay of the MCU is delayed from the power-off time of the PWM control chip U1IC, and the control of the MCU on the PWM control chip is ensured. And due to the existence of the MCU, the MCU can read the battery voltage from the self port, and the MCU can also flexibly select the battery power-down voltage. Therefore, the auxiliary power supply circuit with ultra-low standby power consumption can be implemented, the auxiliary power supply circuit can not be frequently self-started after being turned off, so that the standby power consumption of the system is really reduced, a loop formed by a transformer and a MOS (metal oxide semiconductor) tube through a battery current can be inhibited, the current loss is greatly reduced, and the insufficient voltage of the battery can be flexibly adjusted.
For example, in an ATM of a college or university, there is a battery backup power supply. When schools are exposed to cold and summer holidays, schools usually carry out power grid outage processing on the ATM for safety, the ATM can normally work for a period of time by using battery energy at the initial stage of power grid outage, and when the battery is low in electricity, the ATM stops working and enters a standby mode. If the traditional auxiliary power supply circuit is adopted in the ATM, the auxiliary power supply still works as usual even if the system is shut down, and even if the battery voltage is lower than the normal working voltage of the auxiliary power supply, the auxiliary power supply still frequently starts automatically, the electric quantity loss can be caused continuously, and the service life of the battery can be greatly reduced. After the circuit is adopted, compared with the traditional auxiliary source starting mode, the auxiliary power supply is turned off, so that the energy consumption of the battery is much less in the waiting charging time of 1-2 months, the service life of the battery is greatly prolonged, and the reliability of the system is also improved.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an auxiliary power supply circuit of ultralow stand-by power consumption, includes the transformer, sets up PWM control chip, battery power and the first switch tube on the primary side of transformer, and set up in the output module on the secondary of transformer, its characterized in that further includes: the device comprises a partial pressure adjusting module, a first adjusting module, a second adjusting module and a control module;
the first end of the voltage division adjusting module is connected with the battery power supply to receive input voltage, the second end of the voltage division adjusting module is grounded, and the third end of the voltage division adjusting module is connected with the voltage end of the PWM control chip;
the first end of the first regulating module is connected with the voltage end of the PWM control chip, the second end of the first regulating module is connected with the primary coil of the transformer, and the third end of the first regulating module is grounded;
the first end of the second regulating module is connected with the secondary coil of the transformer, the second end of the second regulating module is connected with the first end of the control module and the feedback control end of the PWM control chip, and the third end of the second regulating module is grounded;
the second end of the control module is connected with the battery power supply, the third end of the control module is grounded, and the fourth end of the control module is connected with the voltage end of the PWM control chip;
calculating a minimum insufficient voltage of a battery based on the minimum starting voltage and the shutdown voltage of the PWM control chip and module parameters of the voltage division adjusting module, wherein the control module selects the minimum insufficient voltage of the battery based on the minimum insufficient voltage of the battery and a power voltage of the battery;
adjusting module parameters of the first adjusting module and the second adjusting module to enable the power supply time of the control module to maintain the power-down of the power supply voltage of the PWM control chip;
when the auxiliary power supply circuit works, the control module collects the input voltage and controls the discharging speed of the power supply voltage when the input voltage is lower than the voltage of the battery with insufficient voltage, and after discharging is finished, the PWM control chip and the control module are powered down;
after the input voltage is reduced to the battery power-lack voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip.
2. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 1, wherein the voltage division adjusting module comprises a first resistor, a second resistor and a first diode, the first resistor and the second resistor are connected in series between the input voltage and the ground, a cathode of the first diode is connected to a voltage division connection point of the first resistor and the second resistor, and an anode of the first diode is connected to the ground, and the voltage division connection point outputs the supply voltage of the PWM control chip to a voltage terminal of the PWM control chip;
and setting the resistance values of the first resistor and the second resistor, and calculating the minimum insufficient voltage of the battery based on the resistance value, the minimum starting voltage of the PWM control chip and the shutdown voltage.
3. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 1, wherein the first regulating module comprises a second diode and a first capacitor, an anode of the second diode is connected to the primary winding of the transformer, a cathode of the second diode is connected to the voltage terminal of the PWM control chip and the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded.
4. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 3, wherein the second regulating module comprises a third diode and a second capacitor, an anode of the third diode is connected with the secondary winding of the transformer, a cathode of the third diode is connected with the first end of the control module and the first end of the second capacitor, and a second end of the second capacitor is grounded;
the capacitance values of the first capacitor and the second capacitor are adjustable so that the power supply time of the control module can maintain the power-down of the power supply voltage of the PWM control chip.
5. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 1, wherein the control module comprises an MCU, a third resistor, a fourth resistor and a second switching tube, a voltage end of the MCU is connected to a second end of the second regulating module, an output end of the MCU is connected to a first end of the second switching tube through the third resistor, a second end of the second switching tube is connected to a voltage end of the PWM control chip through the fourth resistor, a third end of the PWM control chip is grounded, and a data acquisition end of the MCU is connected to the battery power supply;
the MCU collects the input voltage through the data collection end, and sends a shutdown instruction through the output end and adjusts the fourth resistor to adjust the discharge speed of the power supply voltage when the input voltage is lower than the voltage of the insufficient battery.
6. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 5, wherein the control module further comprises a fifth resistor and a sixth resistor, and the data acquisition terminal of the MCU is grounded through the sixth resistor and connected to the battery power supply through the fifth resistor.
7. The ultra-low standby power consumption auxiliary power supply circuit according to claim 5, wherein said MCU is further configured to regulate said battery brownout voltage.
8. The utility model provides an auxiliary power supply circuit of ultralow stand-by power consumption, includes the transformer, sets up PWM control chip, battery power and the first switch tube on the primary side of transformer, its characterized in that further includes: the device comprises a partial pressure adjusting module, an adjusting module and a control module;
the voltage division adjusting module comprises a first resistor, a second resistor and a first diode, wherein the first resistor and the second resistor are connected between input voltage and ground in series, the cathode of the first diode is connected with a voltage division connecting point of the first resistor and the second resistor, and the anode of the first diode is grounded;
the adjusting module comprises a second diode, a first capacitor, a third diode and a second capacitor, wherein the anode of the second diode is connected with the primary coil of the transformer, the cathode of the second diode is connected with the voltage end of the PWM control chip and the first end of the first capacitor, the second end of the first capacitor is grounded, the anode of the third diode is connected with the secondary coil of the transformer, the cathode of the third diode is connected with the first end of the second capacitor, and the second end of the second capacitor is grounded;
the control module comprises an MCU, a third resistor, a fourth resistor and a second switch tube, wherein the voltage end of the MCU is connected with the cathode of the third diode and the feedback control end of the PWM control chip, the output end of the MCU is connected with the first end of the second switch tube through the third resistor, the second end of the second switch tube is connected with the voltage end of the PWM control chip through the fourth resistor, the third end of the second switch tube is grounded, and the data acquisition end of the MCU is connected with the battery power supply;
setting resistance values of the first resistor and the second resistor, and calculating the minimum insufficient voltage of the battery based on the resistance values, the minimum starting voltage of the PWM control chip and the shutdown voltage;
the MCU selects a battery power-down voltage based on the battery minimum power-down voltage and a battery power supply voltage; the capacitance values of the first capacitor and the second capacitor are adjustable, so that the power supply time of the MCU can be maintained until the power supply voltage of the PWM control chip is powered down;
the MCU acquires the input voltage through the data acquisition end, sends a shutdown instruction through the output end when the input voltage is lower than the battery power-shortage voltage, adjusts the fourth resistor to adjust the discharge speed of the power supply voltage, and after the discharge is finished, the PWM control chip and the MCU are powered down;
after the input voltage is reduced to the battery power-lack voltage, the auxiliary power supply circuit starts to work only after the battery power supply is charged to meet the condition that the power supply voltage is greater than the lowest starting voltage of the PWM control chip.
9. The auxiliary power supply circuit with ultra-low standby power consumption according to claim 8, further comprising a fifth resistor and a sixth resistor, wherein the data acquisition terminal of the MCU is grounded via the sixth resistor and is connected to the battery power supply via the fifth resistor.
10. The ultra-low standby power consumption auxiliary power supply circuit according to claim 8, wherein said MCU is further configured to regulate said battery brownout voltage.
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| CN102594141B (en) * | 2011-01-13 | 2014-12-10 | 中兴通讯股份有限公司 | Digital switching power supply conversion device and method |
| CN102957324A (en) * | 2012-11-23 | 2013-03-06 | 深圳市振邦实业有限公司 | Power detection circuit |
| US8836566B2 (en) * | 2013-02-21 | 2014-09-16 | Freescale Semiconductor, Inc. | Low power quantizer for analog to digital converter |
| KR20190036845A (en) * | 2017-09-28 | 2019-04-05 | 에스케이하이닉스 주식회사 | Analog to digital converter with high-speed and low-power, and cmos image sensor thereof |
| CN108173424A (en) * | 2017-12-25 | 2018-06-15 | 四川长虹电器股份有限公司 | A kind of portable device supply power soft switch system |
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Address after: 518000 Room 301, building 1, hualite Industrial Park, Tongguan Road, Tianliao community, Yutang street, Guangming District, Shenzhen City, Guangdong Province Patentee after: Shenzhen youyou Green Energy Co.,Ltd. Address before: 518000 Room 301, building 1, hualite Industrial Park, Tongguan Road, Tianliao community, Yutang street, Guangming District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN UUGREENPOWER ELECTRIC Co.,Ltd. |
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