CN112117803A - Voltage output device and voltage output control method - Google Patents

Voltage output device and voltage output control method Download PDF

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Publication number
CN112117803A
CN112117803A CN202010990013.3A CN202010990013A CN112117803A CN 112117803 A CN112117803 A CN 112117803A CN 202010990013 A CN202010990013 A CN 202010990013A CN 112117803 A CN112117803 A CN 112117803A
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CN
China
Prior art keywords
voltage
power supply
control
conversion circuit
circuit
Prior art date
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Pending
Application number
CN202010990013.3A
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Chinese (zh)
Inventor
黄秋鸣
卢宝平
敖文彬
肖胜宇
吴文贤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202010990013.3A priority Critical patent/CN112117803A/en
Publication of CN112117803A publication Critical patent/CN112117803A/en
Priority to PCT/CN2021/093062 priority patent/WO2022057281A1/en
Pending legal-status Critical Current

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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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a voltage output device and a voltage output control method, wherein the voltage output device is connected between a power supply and electrical equipment, and comprises: the device comprises a voltage detection module, a control module and a DC-DC conversion circuit; the voltage detection module is used for detecting the power supply voltage of the power supply and transmitting the power supply voltage to the control module; the control module is used for generating a control instruction according to the power supply voltage, and the control instruction is used for indicating the DC-DC conversion circuit to carry out voltage conversion; and the DC-DC conversion circuit is used for responding to the control instruction, performing voltage conversion on the power supply voltage of the power supply and transmitting the output voltage after the voltage conversion to the electrical equipment. The embodiment of the invention can convert the power supply voltage of the power supply into the output voltage meeting the requirements of the electrical equipment by voltage conversion, and prolong the time for the power supply to provide the output voltage meeting the requirements for the electrical equipment.

Description

Voltage output device and voltage output control method
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a voltage output device and a voltage output control method.
Background
With the development of technology, household electrical appliances are increasingly miniaturized and intelligentized nowadays. More and more convenient rechargeable household products are pursued, and the requirements on the rechargeable household products are higher and higher. In most of rechargeable household appliances, a lithium battery with high energy density is used as a dc power supply to supply power. Under the ordinary use condition, the power is supplied through the lithium battery, and the normal operation of the motor and the load thereof can be generally ensured until the electric energy consumption of the battery is finished.
However, in the whole power supply process, the power supply voltage of the battery is gradually reduced along with the consumption of the electric energy of the battery, and the using effect of the rechargeable household appliance is reduced in the using process, such as the suction force of the dust collector is reduced, the rotating speed of the shaver is reduced, and the like. When the battery is in a low electric quantity state, the product cannot normally exert the running performance of the product in an original rated voltage state, and only when the battery is fully charged again, the power supply voltage is recovered to be output to a high voltage value, so that the driving equipment in the product can obtain high power again. But the using effect of the product is good, and the using satisfaction of the user on the product is greatly influenced.
Disclosure of Invention
The invention provides a voltage output device and a voltage output control method, aiming at solving the technical problem that the normal use of household appliances is influenced because the battery power supply voltage is gradually reduced along with the consumption of battery electric energy in the prior art.
In a first aspect, the present invention provides a voltage output apparatus connected between a power supply and an electrical device, the voltage output apparatus comprising: the device comprises a voltage detection module, a control module and a DC-DC conversion circuit;
the voltage detection module is used for detecting the power supply voltage of the power supply and transmitting the power supply voltage to the control module;
the control module is used for generating a control instruction according to the power supply voltage, and the control instruction is used for indicating the DC-DC conversion circuit to carry out voltage conversion;
and the DC-DC conversion circuit is used for responding to the control instruction, performing voltage conversion on the power supply voltage of the power supply and transmitting the output voltage after the voltage conversion to the electrical equipment.
Optionally, the DC-DC conversion circuit has a first control end, a second control end, a positive input end, a negative input end, a positive output end, and a negative output end;
the first control end of the DC-DC conversion circuit is connected with the first control end of the control module, the second control end of the DC-DC conversion circuit is connected with the second control end of the control module, the positive input end of the DC-DC conversion circuit is connected with the positive pole of the power supply, the negative input end of the DC-DC conversion circuit is connected with the negative pole of the power supply, the positive output end of the DC-DC conversion circuit is connected with the positive power transmission end of the electrical equipment, and the negative output end of the DC-DC conversion circuit is connected with the negative power transmission end of the electrical equipment.
Optionally, the DC-DC conversion circuit includes: the circuit comprises a first switch device, a first diode, a first inductor, a second switch device, a second diode and a first capacitor;
the control end of the first switch device is connected with the first control end of the DC-DC conversion circuit, the first connection end of the first switch device is connected with the positive input end of the DC-DC conversion circuit, the second connection end of the first switch device is connected with the negative connection end of the first diode, the positive connection end of the first diode is connected with the negative input end of the DC-DC conversion circuit, one end of the first inductor is connected with the negative connection end of the first diode, the other end of the first inductor is connected with the first connection end of the second switch device, the second connection end of the second switch device is connected with the negative connection end of the first diode, the control end of the second switch device is connected with the second control end of the DC-DC conversion circuit, and the other end of the inductor is connected with the positive connection end of the second diode, the negative connection end of the second diode is connected with one end of the first capacitor, the other end of the first capacitor is connected with the second connection end of the second switching device, one end of the first capacitor is connected with the positive output end of the DC-DC conversion circuit, and the other end of the first capacitor is connected with the negative output end of the DC-DC conversion circuit.
Optionally, the voltage detection module has a detection end and an output end;
the detection end of the voltage detection module is connected with the positive electrode of the power supply, and the output end of the voltage detection module is connected with the input end of the control module.
Optionally, the voltage detection module includes: a first resistor, a second resistor and a second capacitor;
the first connection end of the first resistor is connected with the detection end of the voltage detection module, the second connection end of the first resistor is connected with the first connection end of the second capacitor, the second connection end of the second capacitor is grounded, the second connection end of the first resistor is connected with the output end of the voltage detection module, the first connection end of the first resistor is connected with the first connection end of the second resistor, and the second connection end of the second resistor is connected with the second connection end of the second capacitor.
Optionally, the voltage detection module further includes: at least one divider resistor connected in series;
one end of the series branch of at least one divider resistor is connected with the detection end of the voltage detection module, and the other end of the series branch is connected with the first connection end of the first resistor.
Optionally, the control module includes: a main control chip;
the first I/O pin of the main control chip is connected with the first control end of the control module, the second I/O pin of the main control chip is connected with the second control end of the control module, and the third I/O pin of the main control chip is connected with the input end of the control module.
Optionally, the voltage output device further includes: a prompt module;
the control module is further configured to generate a low-power prompt instruction when the power supply voltage of the power supply is lower than a preset low-power state voltage, where the low-power prompt instruction is used for instructing the prompt module to send a low-power prompt;
and the prompt module is used for responding to the low-power prompt instruction and sending out a low-power prompt.
In a second aspect, the present invention provides a voltage output control method applied to the control module according to any one of the first aspect, the method including:
receiving a supply voltage of the power supply;
generating a control instruction according to the power supply voltage, wherein the control instruction is used for instructing the DC-DC conversion circuit to carry out voltage conversion;
and sending the control instruction to the DC-DC conversion circuit to enable the DC-DC conversion circuit to respond to the control instruction, convert the power supply voltage of the power supply and transmit the converted output voltage to the electrical equipment.
Optionally, the generating a control instruction according to the supply voltage, where the control instruction is used to instruct the DC-DC conversion circuit to perform voltage conversion, includes:
and generating a circuit state switching instruction according to the power supply voltage, wherein the circuit state switching instruction is used for indicating the on-off state of a first switching element and a second switching element in the DC-DC conversion circuit so as to switch the circuit state of the DC-DC conversion circuit between a Buck circuit and a Boost circuit.
Optionally, a circuit state switching instruction is generated according to the supply voltage, where the circuit state switching instruction is used to indicate on/off states of a first switching device and a second switching device in a DC-DC conversion circuit, so that a circuit state of the DC-DC conversion circuit is switched between a Buck circuit and a Boost circuit, and the circuit state switching instruction includes:
if the power supply voltage is smaller than a preset rated voltage, generating a first PWM control signal and a first turn-off signal, wherein the first PWM control signal is used for indicating the on-off of the first switching device, the first turn-off signal is used for indicating the turn-off of the second switching device, and the circuit state of the DC-DC conversion circuit is a Buck circuit;
if the power supply voltage is greater than the preset low-power state voltage and less than the preset output voltage, generating a first conduction signal and a second PWM control signal, wherein the first conduction signal is used for indicating the conduction of the first switching device, the second PWM control signal is used for indicating the on-off of the second switching device Q2, and the circuit state of the DC-DC conversion circuit is a Boost circuit.
Optionally, the method further includes:
if the power supply voltage is smaller than the preset low-power state voltage, generating a turn-off instruction, wherein the turn-off instruction is used for indicating a first switching device and a second switching device in the DC-DC conversion circuit to be turned off;
and generating a low-power prompt instruction, wherein the low-power prompt instruction is used for instructing the prompt module to send out a low-power prompt.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
according to the embodiment of the invention, the power supply voltage of the power supply is detected by the voltage detection module, the power supply voltage is transmitted to the control module, the control module generates a control instruction according to the power supply voltage, the DC-DC conversion circuit responds to the control instruction, the voltage conversion is carried out on the power supply voltage of the power supply, and the output voltage after the voltage conversion is transmitted to the electrical equipment.
The embodiment of the invention can control the DC-DC conversion circuit to carry out voltage conversion on the power supply voltage of the power supply according to the power supply voltage of the power supply, provide the converted output voltage to the electrical equipment to supply power to the electrical equipment, realize the conversion of the power supply voltage of the power supply into the output voltage meeting the requirements of the electrical equipment through the voltage conversion, prolong the time for the power supply to provide the output voltage meeting the requirements for the electrical equipment, avoid the problem that the use of the electrical equipment is influenced because the power supply voltage of the power supply is gradually reduced along with the consumption of electric energy, ensure that the electrical equipment can run in a high-performance state and improve the satisfaction degree of users on products.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a voltage output apparatus according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage detection module and a DC-DC conversion circuit in a voltage output apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a voltage output apparatus according to an embodiment of the present invention;
FIG. 4 is a flow chart of a voltage output control method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a voltage stabilizing and converting principle of another embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a principle of converting two modes of linear output voltages according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the whole power supply process, the power supply voltage of the battery is gradually reduced along with the consumption of the electric energy of the battery, so that the use effect of the rechargeable household appliance is reduced in the use process, for example, the suction force of a dust collector is reduced, the rotating speed of a shaver is reduced, and the like. When the battery is in a low electric quantity state, the product cannot normally exert the running performance of the product in an original rated voltage state, and only when the battery is fully charged again, the power supply voltage is recovered to be output to a high voltage value, so that the driving equipment in the product can obtain high power again. But the using effect of the product is good, and the using satisfaction of the user on the product is greatly influenced. To this end, an embodiment of the present invention provides a voltage output apparatus and a voltage output control method, where the voltage output apparatus is connected between a power supply and an electrical device, and as shown in fig. 1, the voltage output apparatus includes: the device comprises a voltage detection module 11, a control module 12 and a DC-DC conversion circuit 13;
the voltage detection module 11 is configured to detect a supply voltage of the power supply and transmit the supply voltage to the control module 12;
the control module 12 is configured to generate a control instruction according to the power supply voltage, where the control instruction is used to instruct the DC-DC conversion circuit to perform voltage conversion;
the DC-DC conversion circuit 13 is configured to perform voltage conversion on the power supply voltage of the power supply in response to the control instruction, and transmit the output voltage after the voltage conversion to the electrical equipment.
According to the embodiment of the invention, the power supply voltage of the power supply is detected by the voltage detection module, the power supply voltage is transmitted to the control module, the control module generates a control instruction according to the power supply voltage, the DC-DC conversion circuit responds to the control instruction, the voltage conversion is carried out on the power supply voltage of the power supply, and the output voltage after the voltage conversion is transmitted to the electrical equipment.
The embodiment of the invention can control the DC-DC conversion circuit to carry out voltage conversion on the power supply voltage of the power supply according to the power supply voltage of the power supply, provide the converted output voltage to the electrical equipment to supply power to the electrical equipment, realize the conversion of the power supply voltage of the power supply into the output voltage meeting the requirements of the electrical equipment through the voltage conversion, prolong the time for the power supply to provide the output voltage meeting the requirements for the electrical equipment, avoid the problem that the use of the electrical equipment is influenced because the power supply voltage of the power supply is gradually reduced along with the consumption of electric energy, ensure that the electrical equipment can run in a high-performance state and improve the satisfaction degree of users on products.
In yet another embodiment of the present invention, the DC-DC conversion circuit 13 has a first control terminal, a second control terminal, a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal;
the first control end of the DC-DC conversion circuit is connected with the first control end of the control module, the second control end of the DC-DC conversion circuit is connected with the second control end of the control module, the positive input end of the DC-DC conversion circuit is connected with the positive pole of the power supply, the negative input end of the DC-DC conversion circuit is connected with the negative pole of the power supply, the positive output end of the DC-DC conversion circuit is connected with the positive power transmission end of the electrical equipment, and the negative output end of the DC-DC conversion circuit is connected with the negative power transmission end of the electrical equipment.
In still another embodiment of the present invention, the DC-DC conversion circuit 13 includes: a first switching device Q1, a first diode D1, a first inductor L1, a second switching device Q2, a second diode D2 and a first capacitor C2;
a control terminal of the first switching device Q1 is connected to a first control terminal of the DC-DC conversion circuit, a first connection terminal of the first switching device Q1 is connected to a positive input terminal of the DC-DC conversion circuit, a second connection terminal of the first switching device Q1 is connected to a negative connection terminal of the first diode D1, a positive connection terminal of the first diode D1 is connected to a negative input terminal of the DC-DC conversion circuit, one terminal of the first inductor L1 is connected to a negative connection terminal of the first diode D1, the other terminal of the first inductor L1 is connected to a first connection terminal of the second switching device Q2, a second connection terminal of the second switching device Q2 is connected to a negative connection terminal of the first diode D1, a control terminal of the second switching device Q2 is connected to a second control terminal of the DC-DC conversion circuit, the other end of the inductor is connected to a positive connection terminal of the second diode D2, a negative connection terminal of the second diode D2 is connected to one end of the first capacitor C2, the other end of the first capacitor C2 is connected to a second connection terminal of the second switching device Q2, one end of the first capacitor C2 is connected to a positive output terminal of the DC-DC conversion circuit, and the other end of the first capacitor C2 is connected to a negative output terminal of the DC-DC conversion circuit.
In another embodiment of the present invention, the voltage detection module 11 has a detection terminal and an output terminal;
the detection end of the voltage detection module is connected with the positive electrode of the power supply, and the output end of the voltage detection module is connected with the input end of the control module.
In another embodiment of the present invention, the voltage detection module 11 includes: a first resistor R5, a second resistor R4 and a second capacitor C1;
a first connection end of the first resistor R5 is connected to a detection end of the voltage detection module, a second connection end of the first resistor R5 is connected to a first connection end of the second capacitor C1, a second connection end of the second capacitor C1 is grounded, a second connection end of the first resistor R5 is connected to an output end of the voltage detection module, a first connection end of the first resistor R5 is connected to a first connection end of the second resistor R4, and a second connection end of the second resistor R4 is connected to a second connection end of the second capacitor C1.
In the embodiment of the invention, the second resistor R4 is a voltage dividing resistor, and the second capacitor C1 and the first resistor R5 form a filter circuit.
In another embodiment of the present invention, the voltage detection module 11 further includes: at least one voltage dividing resistor connected in series, where the voltage dividing resistor may be one or multiple, for example, as shown in fig. 2, the resistor R1, the resistor R2, and the resistor R3 are voltage dividing resistors respectively;
one end of the series branch of at least one divider resistor is connected with the detection end of the voltage detection module, and the other end of the series branch is connected with the first connection end of the first resistor R5.
In a further embodiment of the present invention, the control module 12 comprises: a main control chip;
the first I/O pin of the main control chip is connected with the first control end of the control module, the second I/O pin of the main control chip is connected with the second control end of the control module, and the third I/O pin of the main control chip is connected with the input end of the control module.
In still another embodiment of the present invention, as shown in fig. 3, the voltage output apparatus further includes: a prompt module 14;
the control module is further configured to generate a low-power prompt instruction when the power supply voltage of the power supply is lower than a preset low-power state voltage, where the low-power prompt instruction is used for instructing the prompt module to send a low-power prompt;
and the prompt module 14 is configured to issue a low power prompt in response to the low power prompt instruction.
In another embodiment of the present invention, there is further provided a voltage output control method applied to a control module in the aforementioned voltage output apparatus, as shown in fig. 4, the method includes:
step S101, receiving a power supply voltage of the power supply;
step S102, generating a control instruction according to the power supply voltage, wherein the control instruction is used for instructing the DC-DC conversion circuit to carry out voltage conversion;
step S103, sending the control instruction to the DC-DC conversion circuit, so that the DC-DC conversion circuit converts the power supply voltage of the power supply source in response to the control instruction, and transmits the converted output voltage to the electrical equipment.
In another embodiment of the present invention, the step S102 includes:
and generating a circuit state switching instruction according to the power supply voltage, wherein the circuit state switching instruction is used for indicating the on-off state of a first switching element and a second switching element in the DC-DC conversion circuit so as to switch the circuit state of the DC-DC conversion circuit between a Buck circuit and a Boost circuit.
In another embodiment of the present invention, a circuit state switching instruction is generated according to the supply voltage, the circuit state switching instruction being used to indicate on/off states of a first switching device and a second switching device in a DC-DC conversion circuit so as to switch a circuit state of the DC-DC conversion circuit between a Buck circuit and a Boost circuit, and the method includes:
if the power supply voltage is smaller than a preset rated voltage, generating a first PWM control signal and a first turn-off signal, wherein the first PWM control signal is used for indicating the on-off of the first switching device, the first turn-off signal is used for indicating the turn-off of the second switching device, and the circuit state of the DC-DC conversion circuit is a Buck circuit;
if the power supply voltage is greater than the preset low-power state voltage and less than the preset output voltage, generating a first conduction signal and a second PWM control signal, wherein the first conduction signal is used for indicating the conduction of the first switching device, the second PWM control signal is used for indicating the on-off of the second switching device Q2, and the circuit state of the DC-DC conversion circuit is a Boost circuit.
In order to meet different application requirements, the voltage output device of the embodiment of the invention provides two working modes, wherein the first mode is constant voltage output, the second mode is linear voltage output, and the first mode and the second mode are in independent states in a battery discharge period and cannot be switched; if the mode I and the mode II are switched, the output state and the output mode of the PWM signal corresponding to each mode are changed according to the calculation methods of the output voltage of the two modes and the input voltage of the battery. The two modes have the states of Buck and Boost, according to the actually detected battery voltage and the preset voltage, the battery voltage is lower than the preset voltage and is the Boost, and the battery voltage is higher than the preset voltage and is the Buck.
In practical application, the Buck/Boost circuit output end (namely, the power supply end of the electric load) can output voltage values with different requirements according to the mode I/mode II, so that the electric load is in a better power supply voltage state, and the electric load can be ensured to operate with higher performance.
The voltage stabilization output condition of the first mode of the invention is as follows: as shown in fig. 5, according to the relationship that in the Buck circuit, the duty ratio D is Vo/Vin and Vo/Vin in the Boost circuit is 1/(1-D), when the battery is fully charged to the stabilized output voltage, the first switching device Q1 is turned on and off according to the PWM signal with a certain duty ratio sent by the main control chip, the second switching device Q2 is in a completely off state, the circuit state of the main circuit is the Buck circuit, the battery supply voltage is higher than the stabilized output voltage, and the voltage can be reduced to the rated voltage output by the electrical appliance through the Buck voltage reducing circuit; when the battery supply voltage is greater than the low-power state voltage and less than the output voltage value, the first switching device Q1 is in a complete conduction state, the second switching device Q2 is switched on and off according to a PWM signal with a certain duty ratio sent by the main control chip, the circuit state of the main circuit is a Boost circuit, and the battery supply voltage can be increased to the rated voltage output by the electric appliance through the Boost circuit; when the battery power supply voltage is smaller than the voltage value in the low-electricity state, all the switching devices of the Buck/Boost circuit module are in an off state at the moment, the circuit state is not running, the power supply to the electric appliance is stopped, the voltage of the output end of the Buck/Boost circuit is zero, and meanwhile, the main control part recognizes that the voltage is in the low-electricity state and sends a low-electricity state signal.
The linear voltage output conditions of mode two of the present invention are as follows: as shown in fig. 6, the linear output voltage is always higher than the battery discharge voltage, which can be obtained from the battery discharge curve and the voltage linear output curve. In this case, the circuit state of the conversion circuit is always the Boost circuit. When the battery is in a full-charge state, the voltage detection circuit detects the battery power supply voltage, the linear coefficient of the battery power supply voltage is calculated according to parameters such as the set turn-off threshold voltage and the discharge time of the full-charge-turn-off threshold, and the linear voltage output calculation value is obtained through the actual discharge time, namely the linear coefficient k is (U battery full-charge voltage-U turn-off threshold voltage)/the discharge time from full charge to the turn-off threshold. Through a voltage detection circuit, a main control chip outputs a calculated value according to real-time battery discharge voltage and linear voltage, wherein the calculated value of U linear voltage output is-kt + U battery full-charge voltage, t is actual battery discharge time, and the duty ratio D is determined according to the calculated value of U linear voltage output/U real-time battery supply voltage which is 1/(1-D); the first switching device Q1 in the voltage conversion circuit is in a complete conduction state, the second switching device Q2 receives PWM signals with different duty ratios sent by the main control chip, the actual power supply voltage of the battery is increased to a linear output voltage value from the original discharge voltage, and the voltage output is in a linear state after voltage conversion. When the linear output voltage is smaller than the voltage value in the low power state, all the switching devices of the Buck/Boost circuit module are in an off state at the moment, the circuit state is not running, power supply to the electric appliance is stopped, the voltage of the output end of the voltage conversion circuit is zero, and meanwhile, the main control part identifies the low power state and sends a low power state signal.
An alternative embodiment of the invention is characterized by the use of a Buck circuit only to step down the battery supply voltage to a certain (nominal) voltage at the appliance output; when the battery supply voltage is lower than a certain (rated) voltage of the electric appliance, the battery supply voltage is increased to the certain (rated) voltage without using a Boost circuit, and the voltage conversion circuit is directly turned off. Replacing this feature will affect the time the battery supplies power to the appliance.
The second alternative embodiment of the present invention is characterized in that the battery supply voltage is output by linear voltage conversion only when the linear output voltage is higher than a certain (rated) voltage output by the electric appliance and a voltage value higher than the certain (rated) voltage; when the linear output voltage is lower than a certain (rated) voltage value of the electric appliance or lower, the voltage conversion circuit is turned off, and the linear conversion output of the battery voltage is stopped. Replacing this feature will affect the time the battery supplies power to the appliance.
In yet another embodiment of the present invention, the method further comprises:
if the power supply voltage is smaller than the preset low-power state voltage, generating a turn-off instruction, wherein the turn-off instruction is used for indicating a first switching device and a second switching device in the DC-DC conversion circuit to be turned off, and at the moment, a power supply stops supplying power to electrical equipment;
and generating a low-power prompt instruction, wherein the low-power prompt instruction is used for instructing the prompt module to send out a low-power prompt.
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; 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 such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A voltage output apparatus connected between a power supply source and an electrical device, comprising: the device comprises a voltage detection module, a control module and a DC-DC conversion circuit;
the voltage detection module is used for detecting the power supply voltage of the power supply and transmitting the power supply voltage to the control module;
the control module is used for generating a control instruction according to the power supply voltage, and the control instruction is used for indicating the DC-DC conversion circuit to carry out voltage conversion;
and the DC-DC conversion circuit is used for responding to the control instruction, performing voltage conversion on the power supply voltage of the power supply and transmitting the output voltage after the voltage conversion to the electrical equipment.
2. The voltage output apparatus of claim 1, wherein the DC-DC converter circuit has a first control terminal, a second control terminal, a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal;
the first control end of the DC-DC conversion circuit is connected with the first control end of the control module, the second control end of the DC-DC conversion circuit is connected with the second control end of the control module, the positive input end of the DC-DC conversion circuit is connected with the positive pole of the power supply, the negative input end of the DC-DC conversion circuit is connected with the negative pole of the power supply, the positive output end of the DC-DC conversion circuit is connected with the positive power transmission end of the electrical equipment, and the negative output end of the DC-DC conversion circuit is connected with the negative power transmission end of the electrical equipment.
3. The voltage output apparatus according to claim 2, wherein the DC-DC conversion circuit includes: the circuit comprises a first switch device, a first diode, a first inductor, a second switch device, a second diode and a first capacitor;
the control end of the first switch device is connected with the first control end of the DC-DC conversion circuit, the first connection end of the first switch device is connected with the positive input end of the DC-DC conversion circuit, the second connection end of the first switch device is connected with the negative connection end of the first diode, the positive connection end of the first diode is connected with the negative input end of the DC-DC conversion circuit, one end of the first inductor is connected with the negative connection end of the first diode, the other end of the first inductor is connected with the first connection end of the second switch device, the second connection end of the second switch device is connected with the negative connection end of the first diode, the control end of the second switch device is connected with the second control end of the DC-DC conversion circuit, and the other end of the inductor is connected with the positive connection end of the second diode, the negative connection end of the second diode is connected with one end of the first capacitor, the other end of the first capacitor is connected with the second connection end of the second switching device, one end of the first capacitor is connected with the positive output end of the DC-DC conversion circuit, and the other end of the first capacitor is connected with the negative output end of the DC-DC conversion circuit.
4. The voltage output device of claim 1, wherein the voltage detection module has a detection terminal and an output terminal;
the detection end of the voltage detection module is connected with the positive electrode of the power supply, and the output end of the voltage detection module is connected with the input end of the control module.
5. The voltage output apparatus according to claim 4, wherein the voltage detection module includes: a first resistor, a second resistor and a second capacitor;
the first connection end of the first resistor is connected with the detection end of the voltage detection module, the second connection end of the first resistor is connected with the first connection end of the second capacitor, the second connection end of the second capacitor is grounded, the second connection end of the first resistor is connected with the output end of the voltage detection module, the first connection end of the first resistor is connected with the first connection end of the second resistor, and the second connection end of the second resistor is connected with the second connection end of the second capacitor.
6. The voltage output apparatus of claim 5, wherein the voltage detection module further comprises: at least one divider resistor connected in series;
one end of the series branch of at least one divider resistor is connected with the detection end of the voltage detection module, and the other end of the series branch is connected with the first connection end of the first resistor.
7. The voltage output apparatus of claim 1, wherein the control module comprises: a main control chip;
the first I/O pin of the main control chip is connected with the first control end of the control module, the second I/O pin of the main control chip is connected with the second control end of the control module, and the third I/O pin of the main control chip is connected with the input end of the control module.
8. The voltage output apparatus according to claim 1, characterized by further comprising: a prompt module;
the control module is further configured to generate a low-power prompt instruction when the power supply voltage of the power supply is lower than a preset low-power state voltage, where the low-power prompt instruction is used for instructing the prompt module to send a low-power prompt;
and the prompt module is used for responding to the low-power prompt instruction and sending out a low-power prompt.
9. A voltage output control method applied to the control module according to any one of claims 1 to 8, the method comprising:
receiving a supply voltage of the power supply;
generating a control instruction according to the power supply voltage, wherein the control instruction is used for instructing the DC-DC conversion circuit to carry out voltage conversion;
and sending the control instruction to the DC-DC conversion circuit to enable the DC-DC conversion circuit to respond to the control instruction, convert the power supply voltage of the power supply and transmit the converted output voltage to the electrical equipment.
10. The voltage output control method according to claim 9, wherein the generating a control instruction according to the supply voltage, the control instruction being for instructing the DC-DC conversion circuit to perform voltage conversion, includes:
and generating a circuit state switching instruction according to the power supply voltage, wherein the circuit state switching instruction is used for indicating the on-off state of a first switching element and a second switching element in the DC-DC conversion circuit so as to switch the circuit state of the DC-DC conversion circuit between a Buck circuit and a Boost circuit.
11. The voltage output control method according to claim 10, wherein a circuit state switching instruction is generated according to the supply voltage, the circuit state switching instruction being used for indicating on/off states of a first switching device and a second switching device in a DC-DC conversion circuit so as to switch a circuit state of the DC-DC conversion circuit between a Buck circuit and a Boost circuit, and the method comprises:
if the power supply voltage is smaller than a preset rated voltage, generating a first PWM control signal and a first turn-off signal, wherein the first PWM control signal is used for indicating the on-off of the first switching device, the first turn-off signal is used for indicating the turn-off of the second switching device, and the circuit state of the DC-DC conversion circuit is a Buck circuit;
if the power supply voltage is greater than the preset low-power state voltage and less than the preset output voltage, generating a first conduction signal and a second PWM control signal, wherein the first conduction signal is used for indicating the conduction of the first switching device, the second PWM control signal is used for indicating the on-off of the second switching device Q2, and the circuit state of the DC-DC conversion circuit is a Boost circuit.
12. The voltage output control method of claim 9, further comprising:
if the power supply voltage is smaller than the preset low-power state voltage, generating a turn-off instruction, wherein the turn-off instruction is used for indicating a first switching device and a second switching device in the DC-DC conversion circuit to be turned off;
and generating a low-power prompt instruction, wherein the low-power prompt instruction is used for instructing the prompt module to send out a low-power prompt.
CN202010990013.3A 2020-09-18 2020-09-18 Voltage output device and voltage output control method Pending CN112117803A (en)

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