CN215817911U - Zero current switch direct current buck-boost circuit and integrated circuit thereof - Google Patents

Zero current switch direct current buck-boost circuit and integrated circuit thereof Download PDF

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CN215817911U
CN215817911U CN202122037036.5U CN202122037036U CN215817911U CN 215817911 U CN215817911 U CN 215817911U CN 202122037036 U CN202122037036 U CN 202122037036U CN 215817911 U CN215817911 U CN 215817911U
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circuit
voltage
power switch
zero
transformer
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陈俊
张明超
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MILESTONE SEMICONDUCTOR Inc
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MILESTONE SEMICONDUCTOR Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The utility model provides a zero-current switch direct-current buck-boost circuit, which comprises a zero-crossing detection circuit, an overcurrent detection circuit, a trigger logic circuit, a drive circuit and a power switch, wherein the drive circuit is electrically connected with the logic trigger circuit and the power switch respectively; the zero-crossing detection circuit is respectively electrically connected with the transformer and the trigger logic circuit and is used for detecting whether the voltage of the secondary side of the transformer crosses zero or not and outputting the result to the trigger logic circuit; the overcurrent detection circuit is respectively electrically connected with the power switch, the logic trigger circuit and the transformer and is used for detecting whether the current of the primary side of the transformer exceeds a set value or not and outputting the result to the trigger logic circuit; the trigger logic circuit is electrically connected with the power switch, determines the state of the power switch by performing logic operation on output results of the zero-crossing detection circuit and the overcurrent detection circuit, and drives the power switch.

Description

Zero current switch direct current buck-boost circuit and integrated circuit thereof
Technical Field
The utility model belongs to the technical field of buck-boost circuits, and particularly relates to a zero-current switch direct-current buck-boost circuit and an integrated circuit thereof.
Background
At present, non-isolated BUCK chips are mostly used for vehicle chargers in the market, the voltage resistance of the non-isolated BUCK chips is low (mostly withstand voltage is about 30V), the non-isolated BUCK chips are unsafe, and in case of damage, rear-end electric appliances are extremely easy to damage or accidents are caused.
The capacitive energy storage type electronic igniter is used for generating electric sparks to ignite mixed gas in a cylinder so as to enable an engine to work, and is widely applied to equipment such as motorcycles, gasoline generators and the like. The capacitor energy storage type electronic igniter is composed of a direct current booster, an energy storage capacitor, a thyristor and a thyristor triggering circuit. The existing direct current booster is composed of an oscillator, a transformer and a rectifier.
The working frequency of the existing direct current booster is determined by an oscillator, and in order to reduce the volume of the transformer and improve the reliability, the working of the existing direct current booster is generally required to be ensured to be in a discontinuous mode. Because the time from the turn-off of the primary side switching tube to the completion of the energy output of the transformer is related to the voltage on the energy storage capacitor, the higher the voltage is, the faster the energy output of the transformer is; the lower the voltage, the slower the transformer energy output. In order to ensure that the output voltage still works in a discontinuous mode when being lower, the turn-off time of the switch tube needs to be longer. However, at high voltage, after the energy output of the transformer is completed, the next cycle can be started after the turn-off time is still required to elapse, so that the charging speed is relatively slow, and in order to compensate the charging speed, only the primary current can be increased, and the size of the transformer is correspondingly increased, so that the size of the igniter is large. Meanwhile, LC resonance occurs after the output of the transformer is completed, which causes energy waste and electromagnetic interference.
SUMMERY OF THE UTILITY MODEL
The utility model provides a zero-current switch direct-current buck-boost circuit, which has the advantages of safety, reliability and strong anti-interference capability.
The technical scheme of the utility model is realized as follows: a zero current switch direct current buck-boost circuit comprises a zero crossing detection circuit, an overcurrent detection circuit, a trigger logic circuit, a drive circuit and a power switch, wherein the drive circuit is electrically connected with the logic trigger circuit and the power switch respectively;
the zero-crossing detection circuit is electrically connected with the transformer and the trigger logic circuit respectively and is used for detecting whether the voltage of the secondary side of the transformer crosses zero or not and outputting the result to the trigger logic circuit;
the overcurrent detection circuit is electrically connected with the power switch, the logic trigger circuit and the transformer respectively and is used for detecting whether the current of the primary side of the transformer exceeds a set value or not and outputting the result to the trigger logic circuit;
the trigger logic circuit is electrically connected with the power switch, determines the state of the power switch by performing logic operation on output results of the zero-crossing detection circuit and the over-current detection circuit, and drives the power switch.
As a preferred embodiment, the power switch includes any one of a MOS transistor, a triode, or an IGBT.
As a preferred implementation, the circuit further comprises an enable logic circuit, a voltage feedback circuit, a state output circuit, an over-temperature protection circuit, an overvoltage protection circuit and an overcurrent protection circuit; the output ends of the enabling logic circuit, the voltage feedback circuit, the over-temperature protection circuit, the overvoltage protection circuit and the overcurrent protection circuit are electrically connected with the input end of the triggering logic circuit; the input end of the state output circuit is connected with the output end of the trigger logic circuit.
In a preferred embodiment, the input terminal of the zero-crossing detection circuit is connected with the homonymous terminal of the secondary side of the transformer,
when the power switch is in a turn-off state and the voltage of the dotted terminal of the secondary side of the transformer is less than or equal to OV, the energy output of the transformer is finished, and the output of the zero-crossing detection circuit allows the trigger logic circuit to turn on the power switch;
when the overcurrent detection circuit detects that the current passing through the primary side of the transformer reaches a current limiting value, the output of the overcurrent detection circuit can trigger the logic circuit to turn off the power switch, and meanwhile, the secondary side carries out energy output until the energy output of the transformer is completed, and after the voltage of the same-name end of the secondary side of the transformer is reduced to be less than or equal to OV, the power switch is turned on again to enter the next working cycle to charge the output capacitor.
As a preferred embodiment, after the external power source VCC is powered on, the reference generating circuit generates three reference voltages VR1, VR2 and VR3, an output end of the reference generating circuit is connected to inputs of the zero-crossing detecting circuit, the voltage feedback circuit and the over-current detecting circuit, respectively, the reference voltage VR1 is connected to one input end of the zero-crossing detecting circuit, the reference voltage VR2 is connected to one input end of the feedback circuit, and the reference voltage VR3 is connected to one input end of the over-current detecting circuit; when the voltage VS at the other input end of the voltage feedback circuit is higher than the reference voltage VR2, the output voltage reaches a set value, and the trigger logic circuit prohibits the power switch from being turned on; when the voltage VS IS lower than the reference voltage VR2, the output voltage of the transformer does not reach the set value, the trigger logic circuit allows the power switch to be turned on, and the state of the power switch IS determined by the voltage ZS of the other input end of the zero-crossing detection circuit and the output voltage IS of the power switch; when the voltage ZS IS lower than the reference voltage VR1 and the voltage IS IS lower than the reference voltage VR3, the trigger logic circuit controls the power switch to be turned on; after the power switch IS turned on, until the voltage IS reaches the reference voltage VR3, the trigger logic circuit controls the power switch to be turned off; then the voltage ZS is pulled to a high level, the voltage ZS is not reduced to 0 until the energy output of the transformer is finished, and at the moment, the power switch is turned on again to enter the next period; the chip prohibits the power switch from being turned on until the output voltage reaches a set value, i.e., the voltage VS exceeds the reference voltage VR 2.
A zero-current switch DC buck-boost integrated circuit comprises a zero-current switch DC buck-boost circuit.
In a preferred embodiment, the integrated circuit further includes a power switch.
After the technical scheme is adopted, the utility model has the beneficial effects that:
the scheme of replacing discrete devices can reduce peripheral devices and improve the performance and reliability of products; the ZS end is subjected to partial pressure sampling through RZS1 and RZS2, and the power tube is turned on only when the ZS end detects that the current is zero, so that the switching loss is effectively reduced; the utility model has the advantages of safe and reliable circuit and strong anti-interference capability; the isolation voltage reduction scheme can effectively avoid the damage of a rear-end electric device, has high voltage resistance which can reach 100V and is constant in current and voltage.
Drawings
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 that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a zero current switching DC buck-boost circuit;
FIG. 2 is an internal block diagram of a zero current switching DC buck-boost integrated circuit;
FIG. 3 is a schematic diagram of the zero crossing detection circuit of FIG. 2;
FIG. 4 is a schematic diagram of the over-current detection circuit of FIG. 2;
FIG. 5 is a schematic diagram of the driving circuit of FIG. 2;
FIG. 6 is a diagram of the present invention applied as a boost circuit;
FIG. 7 is a diagram of the application of the present invention as a voltage step-down circuit.
The depressurization is taken as a typical application diagram of an isolation vehicle.
In the figure, 1-zero crossing detection circuit; 2-an over-current detection circuit; 3-a drive circuit; 4-a power switch; 5-logic trigger circuit.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, a zero-current switch dc buck-boost circuit includes a zero-cross detection circuit 1, an overcurrent detection circuit 2, a trigger logic circuit, a driving circuit 3 and a power switch 4, wherein the driving circuit 3 is electrically connected to the logic trigger circuit 5 and the power switch 4 respectively;
the zero-crossing detection circuit 1 is respectively electrically connected with the transformer and the trigger logic circuit and is used for detecting whether the voltage of the secondary side of the transformer crosses zero or not and outputting the result to the trigger logic circuit;
the overcurrent detection circuit 2 is respectively electrically connected with the power switch 4, the logic trigger circuit 5 and the transformer, and is used for detecting whether the current of the primary side of the transformer exceeds a set value and outputting the result to the trigger logic circuit;
the trigger logic circuit is electrically connected with the power switch 4, determines the state of the power switch 4 by performing logic operation on the output results of the zero-crossing detection circuit 1 and the over-current detection circuit 2, and drives the power switch 4.
The power switch 4 includes any one of a MOS transistor, a triode, or an IGBT.
The circuit also comprises an enabling logic circuit, a voltage feedback circuit, a state output circuit, an over-temperature protection circuit, an overvoltage protection circuit and an overcurrent protection circuit; the output ends of the enabling logic circuit, the voltage feedback circuit, the over-temperature protection circuit, the overvoltage protection circuit and the overcurrent protection circuit are electrically connected with the input end of the triggering logic circuit; the input end of the state output circuit is connected with the output end of the trigger logic circuit.
The input end of the zero-crossing detection circuit 1 is connected with the homonymous end of the secondary side of the transformer,
when the power switch 4 is in a turn-off state and the voltage of the dotted terminal of the secondary side of the transformer is less than or equal to OV, the energy output of the transformer is finished, and the output of the zero-crossing detection circuit 1 allows the trigger logic circuit to turn on the power switch 4;
when the overcurrent detection circuit 2 detects that the current passing through the primary side of the transformer reaches a current limiting value, the output of the overcurrent detection circuit 2 can trigger the logic circuit to turn off the power switch 4, and meanwhile, the secondary side carries out energy output until the energy output of the transformer is completed, and after the voltage of the dotted terminal of the secondary side of the transformer is reduced to be less than or equal to OV, the power switch 4 is turned on again to enter the next working cycle to charge the output capacitor.
After an external power supply VCC is electrified, a reference generating circuit generates three reference voltages VR1, VR2 and VR3, the output end of the reference generating circuit is respectively connected with the input ends of a zero-crossing detection circuit 1, a voltage feedback circuit and an overcurrent detection circuit 2, a reference voltage VR1 is connected with one input end of the zero-crossing detection circuit 1, a reference voltage VR2 is connected with one input end of the feedback circuit, and a reference voltage VR3 is connected with one input end of the overcurrent detection circuit 2; when the voltage VS at the other input end of the voltage feedback circuit is higher than the reference voltage VR2, the output voltage reaches a set value, and the trigger logic circuit prohibits the power switch 4 from being turned on; when the voltage VS IS lower than the reference voltage VR2, the output voltage of the transformer does not reach the set value, at this time, the trigger logic circuit allows the power switch 4 to be turned on, and the state of the power switch 4 IS determined by the voltage ZS at the other input end of the zero-crossing detection circuit 1 and the output voltage IS of the power switch 4; when the voltage ZS IS lower than the reference voltage VR1 and the voltage IS IS lower than the reference voltage VR3, the trigger logic circuit controls the power switch 4 to be turned on; after the power switch 4 IS turned on, until the voltage IS reaches the reference voltage VR3, the trigger logic circuit controls the power switch 4 to turn off; then the voltage ZS is pulled to a high level, the voltage ZS is not reduced to 0 until the energy output of the transformer is finished, and at the moment, the power switch 4 is turned on again to enter the next period; the chip inhibits the power switch 4 from turning on until the output voltage reaches a set value, i.e. the voltage VS exceeds the reference voltage VR 2.
A zero-current switch DC buck-boost integrated circuit comprises a zero-current switch DC buck-boost circuit. The aforementioned power switch 4 is also integrated on this integrated circuit.
In the zero-crossing detection circuit 1, a zero-crossing comparator is composed of N7, N8, P8 and P9, ZS compares the collected signals with GND connected with the source end of N7 through a resistor R1, the collected signals are filtered through an output end filter to obtain effective zero-crossing signals ZS1_2, and a comparator composed of P13, P14, N1, N2, N3, P3 and P4 judges whether the output end is short-circuited or not by detecting whether the ZS signals are larger than 1.5V or not. The output short-circuit protection threshold is matched with Rzs1 and Rzs2 to set the output short-circuit judgment voltage, referring to an application circuit diagram 1, when a power MOS tube is turned off, a transformer supplies power to VOUT through D0, and at the moment, the positive terminal voltage of D0 is VOUT + VF. In the period of turning off the power MOS, VOUT + V does not exceed Vzssth (Rzs1+ Rzs2)/Rzs2 all the time, and the output is considered to be short-circuited, thereby triggering a short-circuit protection mechanism.
The over-current detection circuit 2 is composed of two comparators, generates a voltage when the current of power tube flows in resistance RSEN, gathers this voltage and compares with reference voltage, and the chip reaches the current limiting value when time voltage is greater than 0.15V, and the MOS pipe is shut off, thinks that the chip overflows when this voltage is greater than 0.2V, closes MOS immediately this moment and prevents the chip damage.
The driving circuit performs level conversion with a VCC power supply through a 5V internal power supply, VCC with higher voltage is made into MOS driving, and the driving circuit 3 is delayed by a capacitor C1 so as to effectively prevent the P5 and N4 from being conducted simultaneously. (VCC is supplied by an external power supply or VIN is supplied by a resistor, and when VCC is more than 10V, the clamping state is entered.)
When the voltage boosting circuit is used for boosting as shown in fig. 6, 5-15V of power supplied by a storage battery of a circuit motorcycle is input and boosted to 200V to be used as a motorcycle igniter, and the voltage boosting circuit is matched with MST2219 to be used as the igniter.
When the voltage reduction circuit is used for voltage reduction as shown in fig. 7, the vehicle-mounted DCDC output end supplies power or the storage battery directly supplies power (12V-100V input), and the voltage is reduced to 5V to be used as a vehicle-mounted isolation vehicle charge.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A zero current switch direct current buck-boost circuit is electrically connected with a transformer and is characterized by comprising a zero-crossing detection circuit, an overcurrent detection circuit, a trigger logic circuit, a drive circuit and a power switch, wherein the drive circuit is respectively electrically connected with the logic trigger circuit and the power switch;
the zero-crossing detection circuit is respectively electrically connected with the transformer and the trigger logic circuit and is used for detecting whether the voltage of the secondary side of the transformer crosses zero or not and outputting the result to the trigger logic circuit;
the overcurrent detection circuit is respectively electrically connected with the power switch, the logic trigger circuit and the transformer and is used for detecting whether the current of the primary side of the transformer exceeds a set value or not and outputting the result to the trigger logic circuit;
the trigger logic circuit is electrically connected with the power switch, determines the state of the power switch by performing logic operation on output results of the zero-crossing detection circuit and the over-current detection circuit, and drives the power switch.
2. The zero-current switch DC buck-boost circuit according to claim 1, wherein said power switch comprises any one of MOS transistor, triode or IGBT.
3. The zero-current switch direct-current buck-boost circuit according to claim 1 or 2, wherein the input end of the zero-crossing detection circuit is connected with the dotted terminal of the secondary side of the transformer, when the power switch is in an off state and the voltage of the dotted terminal of the secondary side of the transformer is less than or equal to OV, the transformer energy output is completed, and the output of the zero-crossing detection circuit allows the trigger logic circuit to turn on the power switch; when the overcurrent detection circuit detects that the current passing through the primary side of the transformer reaches a current limiting value, the output of the overcurrent detection circuit can trigger the logic circuit to turn off the power switch, and meanwhile, the secondary side carries out energy output until the energy output of the transformer is completed, and after the voltage of the same-name end of the secondary side of the transformer is reduced to be less than or equal to OV, the power switch is turned on again to enter the next working cycle to charge the output capacitor.
4. The zero-current switch dc buck-boost circuit according to claim 1 or 2, further comprising a voltage feedback circuit and a protection circuit, both of which are electrically connected to the input of the trigger logic circuit.
5. The zero-current switch dc buck-boost circuit according to claim 4, wherein after the external power source VCC is powered on, the reference generating circuit generates three reference voltages VR1, VR2 and VR3, and the output terminals of the reference generating circuit are respectively connected to the inputs of the zero-crossing detecting circuit, the voltage feedback circuit and the over-current detecting circuit.
6. The zero-current switching DC buck-boost circuit according to claim 5, wherein said reference voltage VR1 is connected to an input of the zero-crossing detection circuit, said reference voltage VR2 is connected to an input of the feedback circuit, and said reference voltage VR3 is connected to an input of the over-current detection circuit; when the voltage VS at the other input end of the voltage feedback circuit is higher than the reference voltage VR2, the output voltage reaches a set value, and the trigger logic circuit prohibits the power switch from being turned on; when the voltage VS IS lower than the reference voltage VR2, the output voltage of the transformer does not reach the set value, the trigger logic circuit allows the power switch to be turned on, and the state of the power switch IS determined by the voltage ZS of the other input end of the zero-crossing detection circuit and the output voltage IS of the power switch; when the voltage ZS IS lower than the reference voltage VR1 and the voltage IS IS lower than the reference voltage VR3, the trigger logic circuit controls the power switch to be turned on; after the power switch IS turned on, until the voltage IS reaches the reference voltage VR3, the trigger logic circuit controls the power switch to be turned off; then the voltage ZS is pulled to a high level, the voltage ZS is not reduced to 0 until the energy output of the transformer is finished, and at the moment, the power switch is turned on again to enter the next period; the chip prohibits the power switch from being turned on until the output voltage reaches a set value, i.e., the voltage VS exceeds the reference voltage VR 2.
7. A zero-current switching DC buck-boost integrated circuit, comprising the zero-current switching DC buck-boost circuit of any one of claims 1 to 6.
8. The zero-current switching dc buck-boost integrated circuit of claim 7, further integrated with a power switch.
CN202122037036.5U 2021-08-27 2021-08-27 Zero current switch direct current buck-boost circuit and integrated circuit thereof Active CN215817911U (en)

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Application Number Priority Date Filing Date Title
CN202122037036.5U CN215817911U (en) 2021-08-27 2021-08-27 Zero current switch direct current buck-boost circuit and integrated circuit thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122037036.5U CN215817911U (en) 2021-08-27 2021-08-27 Zero current switch direct current buck-boost circuit and integrated circuit thereof

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CN215817911U true CN215817911U (en) 2022-02-11

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