CN107786073B - Standard unit circuit and device of switching power supply - Google Patents
Standard unit circuit and device of switching power supply Download PDFInfo
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- CN107786073B CN107786073B CN201711299715.1A CN201711299715A CN107786073B CN 107786073 B CN107786073 B CN 107786073B CN 201711299715 A CN201711299715 A CN 201711299715A CN 107786073 B CN107786073 B CN 107786073B
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- 238000013461 design Methods 0.000 abstract description 10
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- 230000010354 integration Effects 0.000 abstract description 2
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- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- SWPMTVXRLXPNDP-UHFFFAOYSA-N 4-hydroxy-2,6,6-trimethylcyclohexene-1-carbaldehyde Chemical compound CC1=C(C=O)C(C)(C)CC(O)C1 SWPMTVXRLXPNDP-UHFFFAOYSA-N 0.000 description 2
- 101100507451 Drosophila melanogaster sip3 gene Proteins 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
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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
-
- 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
Abstract
The invention relates to a standard unit circuit and a device of a switching power supply, which comprise a pulse width modulator, an input overvoltage and undervoltage protection circuit, a prohibiting circuit, a signal processing circuit, a short-circuit protection circuit, a synchronous frequency output circuit, a synchronous frequency input circuit, an error signal feedback input circuit, an oscillating circuit and a soft starting circuit. The standard unit circuit of the switching power supply has high integration level and good reliability, and can realize standardized division and generalized design of a standard unit control circuit; the circuit adopts a hexahedral structure, and the chip, the resistor and the capacitor components of the standard unit control circuit are distributed on five surfaces of the structural member, so that a two-dimensional plane is converted into a three-dimensional surface, the area of the two-dimensional plane is effectively reduced by 80% through the space three-dimensional surface, the volume of a switching power supply is further reduced, the power density of the switching power supply is improved, and the switching power supply is convenient for electric interconnection with other substrates.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a standard unit circuit and a device of a switching power supply.
Background
The switching power supply is used as the heart of the electronic equipment and occupies a larger proportion in the whole system. Along with miniaturization and light weight development of the whole system, the miniaturization and light weight requirements of the switching power supply are unavoidable. Therefore, the control unit circuit in the switching power supply is standardized and divided and designed in a generalized mode, and the functions of the control unit circuit in the switching power supply, such as miniaturization, high performance, multifunction, high reliability, low cost and the like, are realized by adopting the SiP technology, such as a three-dimensional structure, chip stacking, chip-to-chip interconnection, flip chip, ball bonding, gradient welding and the like.
The standard unit control circuit (PWM control unit and auxiliary functional unit circuit) is an important component in a switching power supply control system, and has the functions of controlling the on-duty ratio of a power switching tube, and simultaneously having the functions of input overvoltage and undervoltage protection, synchronous frequency input and output, primary prohibition, output short-circuit protection and the like. The standard unit circuit IP core has the characteristics of strong driving capability, complete system functions, universality and the like, can be used as a standard unit circuit design, and is widely applied to various switching power supplies.
The invention relates to a standard unit circuit IP core of a switching power supply and its SiP three-dimensional structure design, which adopts the standardized design and miniaturized design technique of unit circuits; along with the miniaturization, localization, high reliability and improvement of functional requirements of weapon equipment systems, high-reliability H-level direct current-direct current converter products are widely applied; the standard unit circuit IP core of the switching power supply and the three-dimensional structure design of the SiP thereof are mainly used in direct current-direct current converters, other control circuits and miniaturized designs.
Disclosure of Invention
The invention aims to provide a standard unit circuit and a standard unit device of a switching power supply, which can further promote the miniaturization of the volume of a power supply product besides realizing the performance index of the switching power supply.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a standard unit circuit of a switching power supply comprises a pulse width modulator, an input overvoltage and undervoltage protection circuit, a prohibiting circuit, a signal processing circuit, a short circuit protection circuit, a synchronous frequency output circuit, a synchronous frequency input circuit, an error signal feedback input circuit, an oscillating circuit and a soft start circuit, wherein the input overvoltage and undervoltage protection circuit, the prohibiting circuit, the signal processing circuit, the short circuit protection circuit, the synchronous frequency output circuit, the synchronous frequency input circuit, the error signal feedback input circuit, the oscillating circuit and the soft start circuit are connected with the pulse width modulator;
the input overvoltage and undervoltage protection circuit is used for sampling input voltage and comparing the input voltage with a preset voltage reference, and the output pulse signal of the pulse width modulator is controlled to be turned off when the input voltage is too low and too high so as to protect the internal power components of the switching power supply; the disabling circuit is used for enabling control of the pulse width modulator; the error signal feedback input circuit is used for controlling the voltage stabilization of the output voltage of the switching power supply; the soft start circuit is used for controlling the output pulse signal width of the pulse width modulator; the short-circuit protection circuit is used for detecting an input current signal, controlling the voltage loop feedback control circuit to turn off PWM output when the output is short-circuited, and protecting the internal power element of the switching power supply and the system power supply circuit from working in a safe area; the signal processing circuit is used for detecting and processing the current signal and providing a current sampling signal for the pulse width modulator.
As a further improvement of the above technical scheme:
the prohibiting circuit adopts a diode V11, the anode of the diode V11 is connected with the compensation end Comp of the pulse width modulator, and the cathode of the diode V11 is the input end of the signal.
The error signal feedback input circuit comprises a resistor R5, a capacitor C14 and a capacitor C15, the oscillating circuit comprises a resistor R3, a capacitor C11 and a resistor R10, a first end of the resistor R5 and a first end of the capacitor C15 are connected with a compensation end Comp of the pulse width modulator N4, a second end of the resistor R5 is connected with a reference end Ref of the pulse width modulator N4 through the capacitor C14, the reference end Ref is grounded, and a second end of the capacitor C15 is grounded.
The signal processing circuit is composed of a capacitor C13 and a resistor R6, wherein a first end of the capacitor C13 is connected with a current detection end Isense of the pulse width modulator N4, a second end of the capacitor C13 is grounded, a first end of the resistor R6 is connected with the first end of the capacitor C13, and a second end of the resistor R6 is connected with the current detection end Isense of the pulse width modulator N4.
The short-circuit protection circuit comprises a comparator N2, a triode V10, a diode V12, a voltage dividing circuit and a rectifying and filtering circuit, wherein the in-phase input end of the comparator N2 is connected with the output end of the rectifying and filtering circuit, the input end of the rectifying and filtering circuit is connected with a current detection end Isense of a pulse width modulator N4, the inverting input end of the comparator N2 is connected with the output end of the voltage dividing circuit, the input end of the voltage dividing circuit is connected with a reference end Ref of the pulse width modulator N4, the output end of the comparator N2 is connected with the anode of the diode V12, the cathode of the diode V12 is connected with the base electrode of the triode V10 through a resistor R4, the collector electrode of the triode V10 is connected with a compensation end Comp of the pulse width modulator N4, and the emitter of the triode V10 is grounded.
The voltage dividing circuit is composed of a resistor R7 and a resistor R9, the rectifying and filtering circuit is composed of a diode V1, a resistor R8 and a capacitor C17, a first end of the resistor R7 is connected with a reference end Ref of the pulse width modulator N4, a second end of the resistor R7 is connected with an inverting input end of the comparator N2, a first end of the resistor R9 is connected with an inverting input end of the comparator N2, and a second end of the resistor R9 is grounded; the cathode of the diode V1 is connected with the non-inverting input end of the comparator N2, and the anode of the diode V is connected with the current detection end Isense of the pulse width modulator N4.
The synchronous frequency output circuit comprises a comparator N1 and a triode V13, wherein the non-inverting input end of the comparator N1 is connected with an oscillation end RT/CT of the pulse width modulator N4, the inverting input end of the comparator N1 is connected with a collector electrode of the triode V13 through a resistor R11, the output end of the comparator N1 is connected with a base electrode of the triode V13 through a resistor R13, an emitter electrode of the triode V13 is grounded through a resistor R14 and is connected with the inverting input end of the comparator N1 through a resistor R12, and the collector electrode of the triode V13 is connected with a reference end Ref of the pulse width modulator N4.
The synchronous frequency input circuit comprises a triode V7, a resistor R1 and a capacitor C8, the soft start circuit comprises a triode V8, a diode V9, a resistor R2 and a capacitor C9, the base electrode of the triode V7 is connected in series through the resistor R1 and the capacitor C8 to serve as a synchronous frequency input port, the emitting electrode of the triode V7 is connected at a node between the resistor R10 and the capacitor C11, the collector electrode of the triode V8 is grounded, the emitting electrode of the triode V8 is connected with the Comp of the compensation end of the pulse width modulator N4, the base electrode of the triode V8 is connected with the anode of the diode V9, the cathode of the diode V9 is connected with the reference end Ref of the pulse width modulator N4, the collector electrode of the triode V8 is connected with the base electrode of the triode V8 through the capacitor C9, and the base electrode of the triode V8 is connected with the collector electrode of the triode V7 through the resistor R2.
The pulse width modulator adopts a chip with the model number of UC 1843A.
The device comprises the switching power supply standard unit circuit which is of a hexahedral three-dimensional structure and is arranged on five surfaces of the hexahedral device.
According to the technical scheme, the standard unit circuit of the switching power supply can realize the standardized division and the generalized design of the standard unit control circuit, and has the characteristics of high integration level, good reliability, suitability for other control circuit structural designs and the like; the standard unit circuit has a wide working range, can work in a temperature range of-55 ℃ to +125 ℃, and has a structural part quality grade of H level. The device adopted by the circuit is of a 3D structure, the 3D structure is based on an LTCC/HTCC multilayer substrate to realize a hexahedral structure, and chips, resistors and capacitance components of a standard unit control circuit are distributed on five surfaces of a structural member, so that a two-dimensional plane is converted into a three-dimensional surface, the area of the two-dimensional plane is effectively reduced by 80% through a space three-dimensional surface, the volume of a switching power supply is further reduced, and the power density of the switching power supply is improved. Through the surface and inside metallization wiring, realize the electrical connection of electronic components, bottom design BGA (or welded surface), realize with the electrical connection of power electronic components on the Al2O3 film formation base plate, adopt hexahedral structure, be convenient for with other base plates electrical interconnection.
Drawings
FIG. 1 is a circuit block diagram of a standard cell circuit of a switching power supply of the present invention;
FIG. 2 is a circuit diagram of a standard cell circuit of the switching power supply of the present invention;
FIG. 3 is a block diagram of a specific application of the standard cell circuit of the switching power supply of the present invention;
fig. 4 is a schematic view of the structure of the device of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the switching power supply standard unit circuit of the present embodiment includes a pulse width modulator N4, and an input overvoltage/undervoltage protection circuit 20, a disable circuit 11, a signal processing circuit 19, a short-circuit protection circuit 13, a synchronous frequency output circuit 18, a synchronous frequency input circuit 17, an error signal feedback input circuit 16, an oscillation circuit 14, and a soft start circuit 15 connected to the pulse width modulator N4.
The prohibiting circuit 11 is an enabling control for the pulse width modulator 12, and when the INH port inputs a low level, the output pulse signal of the pulse width modulator 12 is turned off, so that the switching power supply has no output voltage;
the pulse width modulator 12 is a core device of the whole circuit, adopts a current control chip with the model of UC1843A, outputs a pulse signal with adjustable duty ratio through a peripheral circuit thereof, and drives the power conversion circuit 2;
the short-circuit protection circuit 13 is used for detecting an input current signal, providing a direct-current voltage signal subjected to rectification and filtration to a forward end of the comparator, comparing the direct-current voltage signal with a reference voltage value at a reverse end of the comparator, and enabling an output signal of the comparison circuit to be low level when the switching power supply works normally; when the output is short-circuited, the output signal of the comparator is high level, the output pulse signal of the pulse width modulator 12 is controlled, the pulse signal output of the pulse width modulator 12 is turned off, and the output voltage is turned off, so that the power element in the switch power supply and the system power supply circuit are protected to work in a safe area;
the oscillating circuit 14 provides clock signals for the pulse width modulator 12, and forms an oscillating circuit through reference voltage, capacitance and resistance of the pulse width modulator 12 to provide constant oscillating frequency signals for the switching power supply circuit;
a soft start circuit 15 for controlling the output pulse signal width at the start-up of the pulse width modulator 12;
the error signal feedback input circuit 16 adopts an amplified error signal to output voltage through a standard unit feedback control circuit, is isolated through photoelectric coupling or transformer coupling 9, and is input to the error signal feedback input circuit 16 to control the voltage stabilization of the output voltage of the switching power supply;
the synchronous frequency input 17 is a pulse signal input to the SYNi port, and is input to the pulse width modulator 12 after being processed by a triode, a capacitor and a resistor so as to realize the frequency synchronization of the oscillation frequency of the pulse width modulator 12 and the pulse signal input to the SYNi port;
the synchronous frequency output 18 is an oscillation frequency signal of the pulse width modulator 12, and is output to the SYNo port after being processed by the comparator, so that the synchronous output of the oscillation frequency of the pulse width modulator 12 is realized;
the signal processing circuit 19 performs signal processing on the current signal detection to provide a current sampling signal for the pulse width modulator 12;
the input overvoltage and undervoltage protection circuit 20 samples the input voltage, compares the input voltage with a preset voltage reference, controls the output pulse signal of the pulse width modulator 12, and turns off the output pulse signal of the pulse width modulator 12 when the input voltage is too low or too high, so as to protect power components and electronic equipment in the switching power supply and provide an input overvoltage and undervoltage protection prohibiting function for the standard unit circuit.
The current signal detection is to detect the current flowing through the resistor Rs by the power conversion circuit 2, and respectively input the current to the short-circuit protection circuit 13 and the signal processing 19, and provide an output fault detection signal for the short-circuit protection circuit 13 and a current sampling signal for the pulse width modulator 12; the short-circuit protection circuit 13 is used for controlling the output pulse of the pulse width modulator 12, and when the output is short-circuited, the PWM output is turned off, and the output voltage is turned off, so that the internal power elements of the switching power supply and the system power supply circuit are protected to work in a safe area.
As shown in fig. 2, the prohibiting circuit 11 employs a diode V11, an anode of the diode V11 is connected to the compensation terminal Comp of the pwm, and a cathode of the diode V11 is an input terminal of the standard cell circuit prohibiting function signal.
The error signal feedback input circuit 16 comprises a resistor R5, a capacitor C14 and a capacitor C15; the first end of the resistor R5 and the first end of the capacitor C15 are connected with the reference end Ref of the pulse width modulator N4, the second end of the resistor R5 is connected with the compensation end Comp of the pulse width modulator N4, and the second end of the capacitor C14 is grounded.
The oscillating circuit 14 includes a resistor R3, a capacitor C11, and a resistor R10; the first end of the resistor R3 and the first end of the capacitor C11 are connected with the first end of the resistor R10 and the oscillating end Rt/Ct of the pulse width modulator N4, the second end of the resistor R3 is connected with the reference end Ref of the pulse width modulator N4, and the second end of the resistor R10 is grounded.
The signal processing circuit 19 includes a capacitor C13 and a resistor R6; the first end of the capacitor C13 is connected to the current detection end Isense of the pulse width modulator N4, the second end of the capacitor C13 is grounded, the first end of the resistor R6 is connected to the first end of the capacitor C13, and the second end of the resistor R6 is connected to the external Irs.
The short-circuit protection circuit 13 includes a diode V1, a resistor R8, a capacitor C17 (rectifying and filtering circuit), a resistor R7, a resistor R9 (voltage dividing circuit), a comparator N2, a diode V12, a resistor R4, a capacitor C10, and a transistor V10; the positive pole of the diode V1 is connected with the Irs outside, the negative pole of the diode V1 is connected with the first end of the resistor R8, the first end of the capacitor C17 and the non-inverting input end of the comparator N2, the second end of the resistor R8 and the second end of the capacitor C17 are connected with the ground end, the first ends of the resistor R7 and the resistor R9 are connected with the inverting input end of the comparator N2, the second end of the resistor R7 is connected with the reference end Ref of the pulse width modulator N4, the second end of the resistor R9 is connected with the ground end, the output end of the comparator N2 is connected with the positive pole of the diode V12, the negative pole of the diode V12 is connected with the first end of the resistor R4, the second end of the resistor R4 is connected with the base electrode of the triode V10 and the first end of the capacitor C10, the second end of the capacitor C10 is grounded, the collector electrode of the triode V10 is connected with the compensation end Comp of the pulse width modulator N4, and the emitter of the triode V10 is connected with the ground end.
The synchronous frequency input circuit 17 comprises a capacitor C8, a resistor R1 and a triode V7; the first end of the capacitor C8 is connected with an external synchronous input end SYNi, the second end of the capacitor C8 is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the base electrode of the triode V7, the collector electrode of the triode V7 is connected with the reference end Ref of the pulse width modulator N4, and the emitter electrode of the triode V7 is connected with the first ends of the capacitor C11 and the resistor R3.
The synchronous frequency output circuit 18 comprises a comparator N1, a triode V13, a resistor R14, a resistor R11 and a resistor R12; the first end of the resistor R11 and the first end of the resistor R12 are connected with the reverse input end of the comparator N1, the second end of the resistor R11 is connected with the reference end Ref of the pulse width modulator N4, the second end of the resistor R12 is connected with the ground end, the forward input end of the comparator N1 is connected with the oscillating end Rt/Ct of the pulse width modulator N4, the output end of the comparator N1 is connected with the first end of the resistor R13, the second end of the resistor R13 is connected with the base electrode of the triode V13, the collector electrode of the triode V13 is connected with the reference end Ref of the pulse width modulator N4, the emitter electrode of the triode V13 is connected with the first end of the resistor R14 and the external SYNo end, and the second end of the resistor R14 is connected with the ground end.
The soft start circuit 15 comprises a triode V8, a diode V9, a resistor R2 and a capacitor C9; the base electrode of the triode V8 is connected with the first end of the resistor R2, the first end of the capacitor C9 and the anode of the diode V9, the collector electrode of the triode V8 and the second end of the capacitor C9 are connected with the ground terminal, the second end of the resistor R2 and the cathode of the diode V9 are connected with the reference end Ref of the pulse width modulator N4, and the emitter electrode of the triode V8 is connected with the compensation end Comp of the pulse width modulator N4.
In this embodiment, the pwm employs a chip model UC 1843A.
The prohibiting circuit 11 controls the output terminal Out of the pulse width modulator N4, when the external INH port is set to a low level, the Comp level of the compensating terminal of the pulse width modulator N4 is low, the output terminal Out of the pulse width modulator N4 has no output, so that the switching power supply has no output voltage; the output voltage is isolated by a standard unit feedback control circuit 10 through photoelectric coupling or transformer coupling 9 and is input to an error signal feedback input circuit 16 to control the voltage stabilization of the output voltage of the switching power supply. The current flowing through the resistor Rs of the power conversion circuit 2 is detected by the signal processing circuit 19, and a current sampling signal is provided for the current detection terminal Isense of the pulse width modulator 12; meanwhile, the direct-current voltage signal after rectification and filtration through the diode V13, the resistor R5 and the capacitor C17 is input into the positive input end of the comparator N2 to provide an output fault detection signal for the short-circuit protection circuit 13, is compared with the preset voltage divided by the resistor R7 and the resistor R9 and is input into the negative input end of the comparator N2, and the output pulse of the pulse width modulator 12 is controlled through the short-circuit protection circuit 13. When the switching power supply works normally, the output signal of the comparator N2 is at a low level; when the output is short-circuited, the output signal of the comparator N2 is at a high level, the output of the pwm 12 is turned off, and the output voltage is turned off, so that the internal power elements of the switching power supply and the system power supply circuit are protected.
The triangular wave of the oscillation end RT/CT of the pulse width modulator N4 is input into the non-inverting input end of the comparator N1 through the synchronous frequency output circuit 18, compared with the preset voltage divided by the inverting input end of the comparator N1 through the resistor R11 and the resistor R12, the output end of the comparator N1 is driven through the resistor R13 and the base electrode of the triode V13 and the resistor R14, and synchronous frequency pulse signals with fixed duty ratio are output. The external pulse signal SYNi is processed by the capacitor C8, the resistor R1 and the triode V7 and then is input to the oscillating circuit 14, so that external frequency synchronization is realized. When the circuit is started, the capacitor C9 is charged through the resistor R2, and the voltage of the Comp at the compensation end of the pulse width modulator N4 is slowly increased through the base control of the triode V8, so that the pulse width of the output Out of the pulse width modulator N4 is gradually released, and the soft start is realized.
Fig. 3 shows a specific application of the switch power supply standard unit circuit in the switch power supply, as shown in fig. 3, the switch power supply circuit comprises an input filter circuit 1, a power conversion circuit 2, a high-frequency transformer 3, an output rectifying circuit 4, an output filter circuit 5, a standard unit feedback control circuit 10, a standard unit circuit 8 and a photoelectric coupling or transformer coupling circuit 9, wherein the output end of the input filter circuit 1 is connected with the input end of the high-frequency transformer 3 through the power conversion circuit 2, the output end of the high-frequency transformer 3 is connected with the input end of the output rectifying circuit 4, the output end of the output rectifying circuit 4 is connected with the input end of the output filter circuit 5, the output end of the output rectifying filter circuit 5 is connected with a load, the input end of the standard unit feedback control circuit 10 is connected with the input end of the standard unit circuit 8 through a photoelectric coupling or transformer coupling circuit 9, the output end of the standard unit circuit 8 is connected with the input end of the power conversion circuit 2, and the output end of the input filter circuit 1 is connected with the standard unit control circuit 8 through an auxiliary power supply 7. The standard cell circuit 8 used in this embodiment is shown in fig. 1 and 2.
Working principle: the input direct-current voltage is supplied by an auxiliary power supply 7 through an input filter circuit 1, the working voltage of a standard unit circuit 8 is supplied by the standard unit circuit 8, a driving signal is supplied to a power switching tube in the power conversion circuit 2, and the direct-current voltage is obtained through an output rectifying circuit 4 and an output filter circuit 5 after the direct-current voltage is isolated and coupled and transformed through a high-frequency transformer 3. In order to realize the required stable output voltage, the standard unit feedback control circuit 10 directly samples the output voltage, compares and amplifies the output voltage with the reference voltage, and feeds back the output voltage to the standard unit control circuit 8 through the photoelectric coupling or the transformer coupling 9 to adjust the duty ratio of the standard unit control circuit 8, thereby realizing the closed-loop control of the output voltage.
In this embodiment, when the circuit is manufactured into a circuit board device, a hexahedral three-dimensional structure is adopted, and the standard unit circuit of the switching power supply is laid out on five surfaces of the hexahedral device, as shown in fig. 4.
According to the basic composition of the circuit function of the switching power supply and through circuit analysis and device characteristic research, the standard unit control circuit realizes a hexahedral 3D structure based on an LTCC/HTCC multilayer substrate, circuit components are arranged on five surfaces of a structural member, a two-dimensional plane is converted into a three-dimensional surface, the area of the two-dimensional plane is effectively reduced by 80% through a space three-dimensional surface, the volume of the switching power supply is further reduced, and the power density of the switching power supply is improved.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The switching power supply device is characterized by being of a hexahedral three-dimensional structure, wherein a switching power supply standard unit circuit is arranged on five surfaces of the hexahedral device and comprises a pulse width modulator, an input overvoltage and undervoltage protection circuit, a prohibiting circuit, a signal processing circuit, a short circuit protection circuit, a synchronous frequency output circuit, a synchronous frequency input circuit, an error signal feedback input circuit, an oscillating circuit and a soft starting circuit, wherein the input overvoltage and undervoltage protection circuit, the prohibiting circuit, the signal processing circuit, the short circuit protection circuit, the synchronous frequency output circuit, the synchronous frequency input circuit, the error signal feedback input circuit and the soft starting circuit are connected with the pulse width modulator;
the input overvoltage and undervoltage protection circuit is used for sampling input voltage and comparing the input voltage with a preset voltage reference, and the output pulse signal of the pulse width modulator is controlled to be turned off when the input voltage is too low and too high so as to protect the internal power components of the switching power supply;
the disabling circuit is used for enabling control of the pulse width modulator, and when the port of the disabling circuit is placed in a low level, the output pulse signal of the pulse width modulator is turned off;
the error signal feedback input circuit is used for controlling the voltage stabilization of the output voltage of the switching power supply;
the soft start circuit is used for controlling the output pulse signal width of the pulse width modulator when the switching power supply is started;
the short-circuit protection circuit is used for detecting an input current signal, controlling the voltage loop feedback control circuit to turn off the output of the pulse width modulator when the output is short-circuited, and protecting the power element in the switch power supply and the system power supply circuit from working in a safe area;
the signal processing circuit is used for detecting and processing the current signal and providing a current sampling signal for the pulse width modulator;
the synchronous frequency output circuit comprises a comparator N1 and a triode V13, wherein the non-inverting input end of the comparator N1 is connected with an oscillation end RT/CT of the pulse width modulator N4, the inverting input end of the comparator N1 is connected with a collector electrode of the triode V13 through a resistor R11, the output end of the comparator N1 is connected with a base electrode of the triode V13 through a resistor R13, an emitter electrode of the triode V13 is grounded through a resistor R14 and is connected with the inverting input end of the comparator N1 through a resistor R12, and the collector electrode of the triode V13 is connected with a reference end Ref of the pulse width modulator N4;
the synchronous frequency input circuit comprises a triode V7, a resistor R1 and a capacitor C8, the soft start circuit comprises a triode V8, a diode V9, a resistor R2 and a capacitor C9, the base electrode of the triode V7 is connected in series through the resistor R1 and the capacitor C8 to serve as a synchronous frequency input port, the emitting electrode of the triode V7 is connected at a node between the resistor R10 and the capacitor C11, the collector electrode of the triode V8 is grounded, the emitting electrode of the triode V8 is connected with the Comp of the compensation end of the pulse width modulator N4, the base electrode of the triode V8 is connected with the anode of the diode V9, the cathode of the diode V9 is connected with the reference end Ref of the pulse width modulator N4, the collector electrode of the triode V8 is connected with the base electrode of the triode V8 through the capacitor C9, and the base electrode of the triode V8 is connected with the collector electrode of the triode V7 through the resistor R2.
2. The switching power supply standard cell circuit of claim 1, wherein: the prohibiting circuit adopts a diode V11, the anode of the diode V11 is connected with the compensation end Comp of the pulse width modulator, and the cathode of the diode V11 is the input end of the signal.
3. The switching power supply standard cell circuit of claim 1, wherein: the error signal feedback input circuit comprises a resistor R5, a capacitor C14 and a capacitor C15, the oscillating circuit comprises a resistor R3, a capacitor C11 and a resistor R10, a first end of the resistor R5 and a first end of the capacitor C15 are connected with a compensation end Comp of the pulse width modulator N4, a second end of the resistor R5 is connected with a reference end Ref of the pulse width modulator N4 through the capacitor C14, the reference end Ref is grounded, and a second end of the capacitor C15 is grounded.
4. A switching power supply standard cell circuit according to claim 3, wherein: the signal processing circuit is composed of a capacitor C13 and a resistor R6, wherein a first end of the capacitor C13 is connected with a current detection end Isense of the pulse width modulator N4, a second end of the capacitor C13 is grounded, a first end of the resistor R6 is connected with the first end of the capacitor C13, and a second end of the resistor R6 is connected with the current detection end Isense of the pulse width modulator N4.
5. The switching power supply standard cell circuit of claim 1, wherein: the short-circuit protection circuit comprises a comparator N2, a triode V10, a diode V12, a voltage dividing circuit and a rectifying and filtering circuit, wherein the in-phase input end of the comparator N2 is connected with the output end of the rectifying and filtering circuit, the input end of the rectifying and filtering circuit is connected with a current detection end Isense of a pulse width modulator N4, the inverting input end of the comparator N2 is connected with the output end of the voltage dividing circuit, the input end of the voltage dividing circuit is connected with a reference end Ref of the pulse width modulator N4, the output end of the comparator N2 is connected with the anode of the diode V12, the cathode of the diode V12 is connected with the base electrode of the triode V10 through a resistor R4, the collector electrode of the triode V10 is connected with a compensation end Comp of the pulse width modulator N4, and the emitter of the triode V10 is grounded.
6. The switching power supply standard cell circuit of claim 5, wherein: the voltage dividing circuit is composed of a resistor R7 and a resistor R9, the rectifying and filtering circuit is composed of a diode V1, a resistor R8 and a capacitor C17, a first end of the resistor R7 is connected with a reference end Ref of the pulse width modulator N4, a second end of the resistor R7 is connected with an inverting input end of the comparator N2, a first end of the resistor R9 is connected with an inverting input end of the comparator N2, and a second end of the resistor R9 is grounded; the cathode of the diode V1 is connected with the non-inverting input end of the comparator N2, and the anode of the diode V is connected with the current detection end Isense of the pulse width modulator N4.
7. The switching power supply standard cell circuit of claim 1, wherein: the pulse width modulator adopts a chip with the model number of UC 1843A.
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