CN110932546A - Constant-power boost output regulating circuit and circuit control method thereof - Google Patents
Constant-power boost output regulating circuit and circuit control method thereof Download PDFInfo
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- CN110932546A CN110932546A CN201911317104.4A CN201911317104A CN110932546A CN 110932546 A CN110932546 A CN 110932546A CN 201911317104 A CN201911317104 A CN 201911317104A CN 110932546 A CN110932546 A CN 110932546A
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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
- H02M3/02—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
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Abstract
The invention discloses a constant-power boost output regulating circuit and a circuit control method thereof. The power supply module supplies power to the booster circuit module, no matter built-in battery supplies power or external power supply supplies power, all need supply power to give the booster circuit module, the MCU module adjusts the duty ratio value through the Pwm boost control end, make booster circuit output a relatively stable preset voltage value, thereby when built-in battery supplies power and external power supply switches, booster circuit output voltage does not receive input voltage's influence, guarantee load motor operating voltage's stability. The load circuit control module controls the conduction of the second switch tube through the MCU module at the starting state of load starting, so that the load works for a short time by using a circuit without boosting, and the load is prevented from being output in a no-load mode and being burnt out.
Description
Technical Field
The invention relates to the field of circuit structures, in particular to a constant-power boost output regulating circuit and a circuit control method thereof.
Background
For a circuit with an external power supply and a built-in low-voltage battery, the problem that the voltages of two power supply ends are different generally exists, the voltages of a load motor are not necessarily the same, and when the power supply of the battery is switched over with the power supply of the external power supply, the working stability of the load motor can be influenced due to the difference between the voltage of the external power supply and the voltage of the battery.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a constant-power boost output regulating circuit, which can provide a constant-power output stable voltage for a load motor through a boost circuit, so that the load motor does not be influenced by the switching of battery power supply and external power supply.
The invention also provides a circuit control method applied to the constant-power boost output regulating circuit.
A constant power boost output regulation circuit according to an embodiment of the first aspect of the present invention includes:
the power supply module 100 comprises an external power supply input end VCC, a first diode D1, a second diode D2, a third diode D3 and a direct-current battery BT, wherein the external power supply input end VCC is connected with the anode of the third diode D3 and the anode of the first diode D1, the anode of the direct-current battery BT is connected with the cathode of the third diode D3 and the anode of the second diode D2, and the cathode of the direct-current battery BT is grounded;
the MCU module comprises a Pwm boost control end Pwm, a load circuit control end FAN and an eighteenth resistor R18, wherein one end of the eighteenth resistor R18 is connected with the cathode of a third diode D3 and the anode of the direct-current battery BT, and the other end of the eighteenth resistor R18 is connected with a power supply end of the MCU module;
the booster circuit module comprises a first inductor L1, a first switch tube Q1, a fourth diode D4, a second capacitor C2, a ninth resistor R9 and a tenth resistor R10, one end of the first inductor L1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, the other end of the first inductor L1 is connected to the anode of the fourth diode D4 and a switch pin of the first switch Q1, the cathode of the fourth diode D4 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is grounded to the other switch pin of the first switch Q1, one end of the ninth resistor R9 is connected to the control end of the first switch transistor Q1 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected to the Pwm boost control terminal Pwm, and the other end of the tenth resistor R10 is grounded;
the load circuit control module comprises a load motor M, a second switch tube Q2, an eleventh resistor R11 and a twelfth resistor R12, wherein the anode of the load motor M is connected with the cathode of the fourth diode D4, the cathode of the load motor M is connected with one switch pin of the second switch tube Q2, the other switch pin of the second switch tube Q2 is grounded, one end of the eleventh resistor R11 is connected with the load circuit control end FAN, the other end of the eleventh resistor R11 is connected with the control pin of the second switch tube Q2 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.
The constant-power boost output regulating circuit provided by the embodiment of the invention at least has the following technical effects: when a direct-current battery is used for supplying power to a load motor, the battery voltage supplies power to the booster circuit module through a second diode D2, and the MCU module regulates the duty ratio of the first switching tube Q1 by controlling a Pwm boosting control end Pwm, so that the booster voltage outputs a stable preset voltage value; when an external power supply is switched to supply power to a load motor, the voltage of the external power supply supplies power to the booster circuit module through the first diode D1, and similarly, the MCU module performs duty ratio adjustment on the first switching tube Q1 by controlling the Pwm boosting control end Pwm, so that the boosted voltage outputs a stable preset voltage value and is not influenced by input voltage, the boosted output voltage cannot be fluctuated when the power supply is switched, and the working stability of the load motor is ensured; at the starting state of load motor start-up, provide a high level for load circuit control end FAN through the MCU module, produce the voltage difference at eleventh resistance R11 both ends to switch on second switch tube Q2, let load motor M use not booster circuit work a short segment of time earlier, prevent because of booster circuit module output is no-load output, make booster voltage too high and burn out load motor M.
According to some embodiments of the present invention, the MCU module further includes an output voltage detection circuit, the output voltage detection circuit includes a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is connected to the negative electrode of the fourth diode D4, the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and the output voltage detection terminal FB, and the other end of the fourteenth resistor R14 is grounded.
According to some embodiments of the present invention, the MCU module further includes a battery voltage detection circuit, the battery voltage detection circuit further includes a battery voltage detection terminal Vfb, the battery voltage detection circuit includes a sixth resistor R6 and a fifth resistor R5, one end of the sixth resistor R6 is connected to the positive electrode of the power supply through an eighteenth resistor R18, the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and the battery voltage detection terminal Vfb, respectively, and the other end of the fifth resistor R5 is grounded.
According to some embodiments of the present invention, the MCU module further includes an external power input voltage detection circuit, the external power input voltage detection circuit includes a nineteenth resistor R19 and a twentieth resistor R20, one end of the nineteenth resistor R19 is connected to the external power input VCC, the other end of the nineteenth resistor R19 is connected to the external power input voltage detection terminal EXP and one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is grounded.
According to some embodiments of the invention, the mobile phone further comprises a switch key module, the switch key module comprises a second resistor R2 and a first key SW1, one end of the second resistor R2 is connected with the MCU module, the other end of the second resistor R2 is connected with one end of the first key SW1, and the other end of the first key SW1 is grounded.
According to some embodiments of the present invention, the first switch Q1 is a mos transistor, and the second switch Q2 is a triode.
According to some embodiments of the invention, the second capacitor C2 is an electrolytic capacitor.
The circuit control method applied to the constant-power boost output regulation circuit according to the first aspect embodiment of the invention comprises the following steps:
presetting a fixed working voltage value, and regulating the output voltage of the booster circuit module by controlling the duty ratio of a Pwm signal output by the Pwm boost control end Pwm;
when the output voltage of the boosting circuit module is larger than the fixed working voltage value, the duty ratio value of a Pwm signal output by the Pwm boosting control end Pwm is reduced, so that the output voltage of the boosting circuit module is reduced;
when the output voltage of the boosting circuit module is smaller than the fixed working voltage value, increasing the duty ratio value of a Pwm signal output by the Pwm boosting control end Pwm, thereby increasing the output voltage of the boosting circuit module;
when the load motor M is started, the MCU module outputs a high level from the load circuit control terminal FAN, turns on the second switching tube Q2, and first allows the load motor M to operate for a period of time using a non-boost circuit, and then controls the duty ratio of the Pwm signal output from the Pwm boost control terminal Pwm, so as to adjust the output voltage of the boost circuit module to the fixed operating voltage value.
The circuit control method provided by the embodiment of the invention at least has the following effects: the output of the booster circuit module is not influenced by the input voltage, so that the booster output voltage is not fluctuated when the power supply is switched, and the working stability of a load motor M is ensured; the output end of the booster circuit module is in no-load output, so that the load motor M is prevented from being burnt out due to overhigh boost voltage.
According to some embodiments of the invention, further comprising the steps of:
the MCU module detects the output voltage detection end FB constantly, when the value of the output voltage detection end FB is higher than the fixed working voltage value by a larger value, the duty ratio value of a Pwm signal output by the Pwm boost control end Pwm is changed into 0, and after a certain time interval, the duty ratio value of the Pwm signal is increased again; if the value of the output voltage detection terminal FB is still larger, adjusting the duty ratio value of the Pwm signal to 0 again, and repeating the cycle for a plurality of times; and if the value of the output voltage detection end FB is still larger, closing the voltage boost control end Pwm of the Pwm and closing the load motor M.
According to some embodiments of the invention, further comprising the steps of:
setting a maximum limit value for the duty ratio value of a Pwm signal output by the Pwm boost control terminal Pwm, and when the duty ratio value of the Pwm signal reaches the maximum limit value, not adjusting the duty ratio value of the Pwm signal;
detecting the battery voltage detection end Vfb, and reducing the fixed working voltage value of the boosted voltage when the battery voltage is lower;
when the constant power boost output regulating circuit does not work, the MCU module sets the battery voltage detection end Vfb, the output voltage detection end FB and the grounding end AGND to be high level output.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic circuit diagram of a constant power boost output regulator circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A constant power boost output regulation circuit according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, a constant power boost output regulation circuit according to an embodiment of the present invention includes:
the power supply module 100 comprises an external power supply input end VCC, a first diode D1, a second diode D2, a third diode D3 and a direct-current battery BT, wherein the external power supply input end VCC is connected with the anode of the third diode D3 and the anode of the first diode D1, the anode of the direct-current battery BT is connected with the cathode of the third diode D3 and the anode of the second diode D2, and the cathode of the direct-current battery BT is grounded;
the MCU module 200 comprises a Pwm boost control end Pwm, a load circuit control end FAN and an eighteenth resistor R18, one end of the eighteenth resistor R18 is connected with the negative electrode of the third diode D3 and the positive electrode of the direct-current battery BT, and the other end of the eighteenth resistor R18 is connected with a power supply end of the MCU module 200;
the boost circuit module 300 comprises a first inductor L1, a first switch tube Q1, a fourth diode D4, a second capacitor C2, a ninth resistor R9 and a tenth resistor R10, wherein one end of the first inductor L1 is connected with the cathode of the first diode D1 and the cathode of the second diode D2, the other end of the first inductor L1 is connected with the anode of the fourth diode D4 and one switch pin of the first switch tube Q1, the cathode of the fourth diode D4 is connected with one end of the second capacitor C2, the other end of the second capacitor C2 and the other switch pin of the first switch tube Q1 are grounded, one end of the ninth resistor R9 is connected with the control end of the first switch tube Q1 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected with the boost control end Pwm, and the other end of the tenth resistor R10 is grounded;
the load circuit control module 400 includes a load motor M, a second switch tube Q2, an eleventh resistor R11, and a twelfth resistor R12, wherein the anode of the load motor M is connected to the cathode of the fourth diode D4, the cathode of the load motor M is connected to a switch pin of the second switch tube Q2, another switch pin of the second switch tube Q2 is grounded, one end of the eleventh resistor R11 is connected to the load circuit control terminal FAN, the other end of the eleventh resistor R11 is connected to the control pin of the second switch tube Q2 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.
According to the constant-power boost output regulating circuit provided by the embodiment of the invention, when a direct-current battery is used for supplying power to a load motor, the battery voltage supplies power to the boost circuit module 300 through the second diode D2, and the MCU module 200 regulates the duty ratio of the first switching tube Q1 by controlling the Pwm boost control end Pwm, so that the boost voltage outputs a stable preset voltage value; when an external power supply is switched to supply power to the load motor, the external power supply voltage supplies power to the booster circuit module 300 through the first diode D1, and similarly, the MCU module 200 performs duty ratio adjustment on the first switching tube Q1 by controlling the Pwm boost control terminal Pwm, so that the boost voltage outputs a stable preset voltage value, which is not affected by the input voltage, and when the power supply is switched, the boost output voltage is not fluctuated, thereby ensuring the stability of the operation of the load motor M; in the starting state of the load motor M, the MCU module 200 provides a high level to the load circuit control terminal FAN, and a voltage difference is generated across the eleventh resistor R11, so as to turn on the second switch Q2, so that the load motor M can operate for a short time without the voltage boost circuit, thereby preventing the load motor M from being burned out due to the over-high boost voltage caused by the no-load output of the output terminal of the voltage boost circuit module 300.
As shown in fig. 1, in some embodiments of the present invention, the MCU module further includes an output voltage detection circuit 500, the output voltage detection circuit 500 further includes an output voltage detection terminal FB, the output voltage detection circuit 500 includes a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is connected to the negative electrode of the fourth diode D4, the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and the output voltage detection terminal FB, and the other end of the fourteenth resistor R14 is grounded. After the boost output of the boost circuit module 300, the MCU module 200 feeds back the voltage divided by the thirteenth resistor R13 and the fourteenth resistor R14 to the MCU module 200, and the MCU module 200 adjusts the duty ratio through the Pwm boost control terminal Pwm to stabilize the output voltage of the boost circuit module 300 at the preset value.
As shown in fig. 1, in some embodiments of the present invention, the MCU module further includes a battery voltage detection circuit 600, the battery voltage detection circuit 600 further includes a battery voltage detection terminal Vfb, the battery voltage detection circuit 600 includes a sixth resistor R6 and a fifth resistor R5, one end of the sixth resistor R6 is connected to the positive electrode of the power supply through an eighteenth resistor R18, the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5 and the battery voltage detection terminal Vfb, and the other end of the fifth resistor R5 is grounded. The voltage value of the battery is judged by detecting the voltage dividing resistors of the fifth resistor R5 and the trickle resistor R6, and when the voltage of the battery is lower, the set value of the boost output voltage is reduced, so that the input current is reduced, and the working time of a product can be prolonged.
As shown in fig. 1, in some embodiments of the present invention, the MCU module further includes an external power input voltage detection circuit 700, the external power input voltage detection circuit 700 further includes an external power input voltage detection terminal EXP, the external power input voltage detection circuit 700 includes a nineteenth resistor R19 and a twentieth resistor R20, one end of the nineteenth resistor R19 is connected to the external power input terminal VCC, the other end of the nineteenth resistor R19 is connected to the external power input voltage detection terminal EXP and one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is grounded.
As shown in fig. 1, in some embodiments of the invention, the switch key module 210 further includes a second resistor R2 and a first key SW1, one end of the second resistor R2 is connected to the MCU module 200, the other end of the second resistor R2 is connected to one end of the first key SW1, and the other end of the first key SW1 is grounded.
In some embodiments of the present invention, as shown in fig. 1, the first switch Q1 is a mos transistor, and the second switch Q2 is a triode.
In some embodiments of the invention, as shown in fig. 1, the second capacitor C2 is an electrolytic capacitor. The electrolytic capacitor has large capacitance and low price.
According to an embodiment of the second aspect of the present invention, the circuit control method applied to the constant power boost output regulating circuit of the first aspect of the present invention includes the following steps:
presetting a fixed working voltage value, and adjusting the output voltage of the booster circuit module 300 by controlling the duty ratio of a Pwm signal output by a Pwm boost control end Pwm;
when the output voltage of the booster circuit module 300 is larger than the fixed operating voltage value, the duty ratio of the Pwm signal output by the Pwm boost control terminal Pwm is reduced, thereby reducing the output voltage of the booster circuit module 300;
when the output voltage of the booster circuit module 300 is smaller than the fixed operating voltage value, the duty ratio of the Pwm signal output by the Pwm boost control terminal Pwm is increased, thereby increasing the output voltage of the booster circuit module 300;
when the load motor M is started, the MCU module 200 outputs a high level from the load circuit control terminal FAN, turns on the second switching tube Q2, first allows the load motor M to operate for a period of time using a non-boost circuit, then controls the duty ratio of the Pwm signal output from the Pwm boost control terminal Pwm, and adjusts the output voltage of the boost circuit module 300 to a fixed operating voltage value;
the circuit control method provided by the embodiment of the invention at least has the following effects: the direct-current battery power supply or the external power supply supplies power to the booster circuit module 300 firstly, the output voltage is adjusted through the duty ratio value of the Pwm boosting control end Pwm, the output of the booster circuit module 300 is not influenced by the input voltage, the boosted output voltage cannot be fluctuated when the power supply is switched, and the working stability of a load motor is ensured; the load motor is prevented from being burnt out due to overhigh boosted voltage because the output end of the booster circuit module 300 is in no-load output.
In some embodiments of the present invention, the method further comprises the steps of: the MCU module 200 constantly detects the output voltage detection terminal FB, changes the duty ratio of the Pwm signal output by the Pwm boost control terminal Pwm to 0 when the value of the output voltage detection terminal FB is higher than the fixed working voltage value, and increases the duty ratio of the Pwm signal again after a certain time interval; if the value of the output voltage detection end FB is still larger, the duty ratio value of the Pwm signal is adjusted to 0 again, and the cycle is repeated for a plurality of times; and if the value of the output voltage detection end FB is still larger, closing the voltage boost control end Pwm of the Pwm and closing the load motor M. The load is prevented from being suddenly disconnected, so that the load becomes no-load output and is easily damaged.
In some embodiments of the present invention, the method further comprises the steps of: setting a maximum limit value for the duty ratio value of a Pwm signal output by a Pwm boost control terminal Pwm, and when the duty ratio value of the Pwm signal reaches the maximum limit value, not adjusting the duty ratio value of the Pwm signal; detecting a battery voltage detection end Vfb, and reducing the fixed working voltage value of the boosted voltage when the battery voltage is lower; when the constant power boost output regulator circuit does not operate, the MCU block 200 sets the battery voltage detection terminal Vfb, the output voltage detection terminal FB, and the ground terminal AGND to a high level output.
When the battery voltage is reduced, the duty ratio value of the Pwm signal needing boosting needs to be increased, and the maximum limit value of the duty ratio value is set, so that the situation that a continuously larger duty ratio value has a larger influence on the components of the boosting circuit can be prevented; meanwhile, the voltage value of the battery is detected by using the voltage dividing resistors of the fifth resistor R5 and the sixth resistor R6, and when the voltage of the battery is lower, the set value of the boosted output voltage is reduced, so that the input current is reduced, and the working time of the product can be prolonged; when the product does not work, the MCU control module sets the Vfb terminal, the FB terminal and the AGND terminal to be high-level output, so that voltage differences do not exist at the two ends of the fifth resistor R5, the sixth resistor R6, the thirteenth resistor R13 and the fourteenth resistor R4, a loop is not formed, current is not consumed, and standby loss of the product is reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A constant power boost output regulation circuit, comprising:
the power supply module comprises an external power supply input end VCC, a first diode D1, a second diode D2, a third diode D3 and a direct-current battery BT, wherein the external power supply input end VCC is connected with the anode of the third diode D3 and the anode of the first diode D1, the anode of the direct-current battery BT is connected with the cathode of the third diode D3 and the anode of the second diode D2, and the cathode of the direct-current battery BT is grounded;
the MCU module comprises a Pwm boost control end Pwm, a load circuit control end FAN and an eighteenth resistor R18, wherein one end of the eighteenth resistor R18 is connected with the cathode of a third diode D3 and the anode of the direct-current battery BT, and the other end of the eighteenth resistor R18 is connected with a power supply end of the MCU module;
the booster circuit module comprises a first inductor L1, a first switch tube Q1, a fourth diode D4, a second capacitor C2, a ninth resistor R9 and a tenth resistor R10, one end of the first inductor L1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, the other end of the first inductor L1 is connected to the anode of the fourth diode D4 and a switch pin of the first switch Q1, the cathode of the fourth diode D4 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is grounded to the other switch pin of the first switch Q1, one end of the ninth resistor R9 is connected to the control end of the first switch transistor Q1 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is connected to the Pwm boost control terminal Pwm, and the other end of the tenth resistor R10 is grounded;
the load circuit control module comprises a load motor M, a second switch tube Q2, an eleventh resistor R11 and a twelfth resistor R12, wherein the anode of the load motor M is connected with the cathode of the fourth diode D4, the cathode of the load motor M is connected with one switch pin of the second switch tube Q2, the other switch pin of the second switch tube Q2 is grounded, one end of the eleventh resistor R11 is connected with the load circuit control end FAN, the other end of the eleventh resistor R11 is connected with the control pin of the second switch tube Q2 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.
2. A constant power boost output regulation circuit according to claim 1, further comprising an output voltage detection circuit, said MCU module further comprising an output voltage detection terminal FB, said output voltage detection circuit comprising a thirteenth resistor R13 and a fourteenth resistor R14, one end of said thirteenth resistor R13 being connected to the negative electrode of said fourth diode D4, the other end of said thirteenth resistor R13 being connected to one end of said fourteenth resistor R14 and said output voltage detection terminal FB, respectively, and the other end of said fourteenth resistor R14 being grounded.
3. A constant power boost output regulation circuit according to claim 1, further comprising a battery voltage detection circuit, said MCU module further comprising a battery voltage detection terminal Vfb, said battery voltage detection circuit comprising a sixth resistor R6 and a fifth resistor R5, one end of said sixth resistor R6 being connected to the positive electrode of the power supply through an eighteenth resistor R18, the other end of said sixth resistor R6 being connected to one end of said fifth resistor R5 and said battery voltage detection terminal Vfb, respectively, and the other end of said fifth resistor R5 being grounded.
4. The constant-power boost output regulation circuit according to claim 1, further comprising an external power input voltage detection circuit, wherein the MCU module further comprises an external power input voltage detection terminal EXP, the external power input voltage detection circuit comprises a nineteenth resistor R19 and a twentieth resistor R20, one end of the nineteenth resistor R19 is connected to the external power input terminal VCC, the other end of the nineteenth resistor R19 is connected to the external power input voltage detection terminal EXP and one end of the twentieth resistor R20, respectively, and the other end of the twentieth resistor R20 is grounded.
5. A constant power boost output regulation circuit according to claim 1, further comprising a switch key module, said switch key module comprising a second resistor R2 and a first key SW1, one end of said second resistor R2 being connected to said MCU module, the other end of said second resistor R2 being connected to one end of said first key SW1, the other end of said first key SW1 being grounded.
6. A constant power boost output regulator circuit according to claim 1, wherein said first switch transistor Q1 is mos transistor and said second switch transistor Q2 is triode.
7. A constant power boost output regulation circuit according to claim 1 wherein the second capacitor C2 is an electrolytic capacitor.
8. A circuit control method applied to a constant power boost output regulation circuit according to any one of claims 1 to 7, characterized by comprising the steps of:
presetting a fixed working voltage value, and regulating the output voltage of the booster circuit module by controlling the duty ratio of a Pwm signal output by the Pwm boost control end Pwm;
when the output voltage of the boosting circuit module is larger than the fixed working voltage value, the duty ratio value of a Pwm signal output by the Pwm boosting control end Pwm is reduced, so that the output voltage of the boosting circuit module is reduced;
when the output voltage of the boosting circuit module is smaller than the fixed working voltage value, increasing the duty ratio value of a Pwm signal output by the Pwm boosting control end Pwm, thereby increasing the output voltage of the boosting circuit module;
when the load motor M is started, the MCU module outputs a high level from the load circuit control terminal FAN, turns on the second switching tube Q2, and first allows the load motor M to operate for a period of time using a non-boost circuit, and then controls the duty ratio of the Pwm signal output from the Pwm boost control terminal Pwm, so as to adjust the output voltage of the boost circuit module to the fixed operating voltage value.
9. The circuit control method according to claim 8, further comprising the steps of:
the MCU module detects the output voltage detection end FB constantly, when the value of the output voltage detection end FB is higher than the fixed working voltage value by a larger value, the duty ratio value of a Pwm signal output by the Pwm boost control end Pwm is changed into 0, and after a certain time interval, the duty ratio value of the Pwm signal is increased again; if the value of the output voltage detection terminal FB is still larger, adjusting the duty ratio value of the Pwm signal to 0 again, and repeating the cycle for a plurality of times; and if the value of the output voltage detection end FB is still larger, closing the voltage boost control end Pwm of the Pwm and closing the load motor M.
10. The circuit control method according to claim 8, further comprising the steps of:
setting a maximum limit value for the duty ratio value of a Pwm signal output by the Pwm boost control terminal Pwm, and when the duty ratio value of the Pwm signal reaches the maximum limit value, not adjusting the duty ratio value of the Pwm signal;
detecting the battery voltage detection end Vfb, and reducing the fixed working voltage value of the boosted voltage when the battery voltage is lower;
when the constant power boost output regulating circuit does not work, the MCU module sets the battery voltage detection end Vfb, the output voltage detection end FB and the grounding end AGND to be high level output.
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| CN201911317104.4A CN110932546A (en) | 2019-12-19 | 2019-12-19 | Constant-power boost output regulating circuit and circuit control method thereof |
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| CN115454196A (en) * | 2022-09-30 | 2022-12-09 | 广东金莱特智能科技有限公司 | Reference voltage control device, method and storage medium |
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| CN113937856A (en) * | 2021-10-16 | 2022-01-14 | 深圳市海曼科技股份有限公司 | System and method for preventing singlechip in battery power supply equipment from being reset due to voltage reduction |
| CN115454196A (en) * | 2022-09-30 | 2022-12-09 | 广东金莱特智能科技有限公司 | Reference voltage control device, method and storage medium |
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