CN216564618U - Seamless switching circuit with anti-surge function - Google Patents
Seamless switching circuit with anti-surge function Download PDFInfo
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- CN216564618U CN216564618U CN202121099960.XU CN202121099960U CN216564618U CN 216564618 U CN216564618 U CN 216564618U CN 202121099960 U CN202121099960 U CN 202121099960U CN 216564618 U CN216564618 U CN 216564618U
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Abstract
The utility model discloses a seamless switching circuit with an anti-surge function, which comprises a sampling circuit, a surge suppression driving circuit and a switching control circuit which are sequentially connected; the positive end of power supply output is connected to the sampling circuit input, and surge suppression drive circuit connects TVS transient suppressor, and switching control circuit connects FJD switching control end, and surge suppression drive circuit ground connection, power input output negative terminal link to each other with the ground terminal. The utility model ensures seamless switching of power supply current, improves the efficiency of electronic equipment, reduces power loss, has simpler circuit form and reliability, and solves the problems of narrow input voltage range, and poor anti-surge and anti-interference capability of the existing power supply switching circuit.
Description
Technical Field
The utility model belongs to the technical field of power supply equipment, and particularly relates to a seamless switching circuit with an anti-surge function.
Background
Along with the development of industry, the requirement of users on electric equipment is higher and higher, the key that the stable and reliable operation of the electric equipment is influenced by a power supply part is realized, when an external power supply system is unstable, only a standby power supply can be switched, the halt or reset of a single chip microcomputer is easy to cause, a power supply switching circuit of the conventional stable power supply system mainly depends on a switching or comparator, a battery power supply is switched according to the requirement of airborne electric equipment to provide voltage for electric facilities, but the defects of narrow input voltage range, no over-voltage and under-voltage protection function and poor anti-surge and anti-interference capabilities exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a seamless switching circuit with a surge prevention function, and solves the problems of narrow input voltage range, and poor surge prevention and anti-jamming capabilities of the conventional power switching circuit.
The utility model adopts the technical scheme that the seamless switching circuit with the surge prevention function comprises a sampling circuit, a surge suppression driving circuit and a switching control circuit which are sequentially connected; the positive end of sampling circuit input is connected the positive end of power supply output, and surge suppression drive circuit connects TVS transient state suppressor, and switching control circuit connects FJD switching control end, and surge suppression drive circuit ground connection, power input output negative terminal links to each other with the ground terminal.
The present invention is also characterized in that,
the switching control circuit comprises a trigger U2, a comparator U3A, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C2 and a transmission device Q3, wherein a pin 1 of the comparator U3A is respectively connected with the resistor R9 and the resistor R10, a pin 2 of the amplifier U3A is connected with the resistor R8, the resistor R8 is connected with the trigger U2, a pin 1 of the trigger U2 is respectively connected with the resistor R7 and the resistor R8, a pin 3 of the amplifier U3A is respectively connected with the resistor R5 and the resistor R9, the resistor R5 is connected with the resistor R6, a pin 4 of the amplifier U3A is connected with the resistor R11, the resistor R10 and the resistor R11 are connected with the transmission device Q3, and the transmission device Q3 is connected with the capacitor C2 through the resistor R12 and then grounded.
The surge suppression driving circuit comprises a surge controller U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R13, a capacitor C1, a transmission device Q1 and a transmission device Q2, wherein an OUT interface and a SENS sensing signal end of the surge controller U1 are connected with the resistor R4, DGATE is connected with a transmission device Q2 through the resistor R, SOURCE is connected with the transmission device Q2, HGATE is connected with the transmission device Q1 through the resistor R2, VCC is grounded through the resistor R1 and the capacitor C1, SHDN and UV are connected with the resistor R12, OV, GND, FLT and EAOUT are grounded, TMR is connected with the capacitor C3, and FB is connected with the resistor R13; the input and output ends of the surge suppression driving circuit are merged into a corresponding TVS transient suppressor V1, the TVS transient suppressor V1 is connected with a unidirectional transient suppressor V2, and the unidirectional transient suppressor V2 is connected with a resistor R1.
The sampling circuit comprises a capacitor C4 and a capacitor C6, wherein the capacitor C4 is connected with a resistor R4 and a resistor R13 in series after being connected with a capacitor C6 in parallel.
The surge suppressor U1 includes a timed current limit circuit breaker.
The surge controller U1 is of LTC4364 type.
The transmission device Q1, the transmission device Q2 and the transmission device Q3 all adopt N-MOSFET tubes.
The utility model has the beneficial effects that: adopt surge protection peak suppression circuit, promote electrical power generating system's interference killing feature, merge corresponding TVS transient state suppressor into at surge protection circuit's input and output, have fine effect to absorbing the peak pulse. For power supply drop interference, a power supply chip with a wide voltage input range is selected, and a filter capacitor of a power supply is added.
Drawings
FIG. 1 is a schematic block diagram of a seamless switching circuit with surge protection of the present invention;
FIG. 2 is a schematic diagram of a seamless switching circuit with surge protection of the present invention;
FIG. 3 is a SHQHDL001 seamless handover module outline diagram according to an embodiment of the present invention;
in the figure, 1 is a positive circuit input terminal, 2 is a negative circuit input and output terminal, 3 is a circuit switching control terminal, and 4 is a positive circuit output terminal.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model relates to a seamless switching circuit with anti-surge function, as shown in fig. 1 and fig. 2, comprising a sampling circuit, a surge suppression driving circuit and a switching control circuit which are connected in sequence; the positive end of sampling circuit input is connected the positive end of power supply output, and surge suppression drive circuit connects TVS transient state suppressor, and switching control circuit connects FJD switching control end, and surge suppression drive circuit ground connection, power input output negative terminal links to each other with the ground terminal.
The switching control circuit comprises a trigger U2, a comparator U3A, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C2 and a transmission device Q3, wherein a pin 1 of the comparator U3A is respectively connected with the resistor R9 and the resistor R10, a pin 2 of the amplifier U3A is connected with the resistor R8, the resistor R8 is connected with the trigger U2, a pin 1 of the trigger U2 is respectively connected with the resistor R7 and the resistor R8, a pin 3 of the amplifier U3A is respectively connected with the resistor R5 and the resistor R9, the resistor R5 is connected with the resistor R6, a pin 4 of the amplifier U3A is connected with the resistor R11, the resistor R10 and the resistor R11 are connected with the transmission device Q3, and the transmission device Q3 is connected with the capacitor C2 through the resistor R12 and then grounded; the trigger U2 controls the on-off of the transmission device Q3 to complete voltage reduction conversion, and the overcurrent protection function is achieved.
The sampling circuit comprises a capacitor C4 and a capacitor C6, wherein the capacitor C4 is connected with a resistor R4 and a resistor R13 in series after being connected with a capacitor C6 in parallel.
The surge suppression driving circuit comprises a surge controller U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R13, a capacitor C1, a transmission device Q1 and a transmission device Q2, wherein an OUT interface and a SENS sensing signal end of the surge controller U1 are connected with the resistor R4, DGATE is connected with a transmission device Q2 through the resistor R, SOURCE is connected with the transmission device Q2, HGATE is connected with the transmission device Q1 through the resistor R2, VCC is grounded through the resistor R1 and the capacitor C1, SHDN and UV are connected with the resistor R12, OV, GND, FLT and EAOUT are grounded, TMR is connected with the capacitor C3, and FB is connected with the resistor R13; the input and output ends of the surge suppression driving circuit are merged into a corresponding TVS transient suppressor V1, a TVS transient suppressor V1 is connected with a unidirectional transient suppressor V2, and a unidirectional transient suppressor V2 is connected with a resistor R1.
The surge controller U1 includes a timed current limiting circuit breaker. In the event of a fault, an adjustable fault timer must be terminated before the transmission device Q1 and the transmission device Q2 turn off and automatically restarted after a delay.
Surge controller U1 is of the type LTC4364 for protection of the load from high voltage transients.
The pass device Q1, the pass device Q2, and the pass device Q3 all use N-MOSFET transistors, which limit and regulate the output during overvoltage by controlling the voltage drop across the N-MOSFET transistor of the pass device Q2. The pass device Q1 provides reverse input protection, reducing voltage drop and power loss. The surge controller U1 accurately monitors the input power supply for an under-voltage (UV) condition and controls the forward voltage drop across the N-MOSFET of the pass device Q2 to keep it off under the under-voltage condition and to minimize reverse current transients during power failures, under-voltages or input shorts.
By driving the switch N-MOSFET, high precision output voltage is provided under a wide input voltage range.
The SHQHDL001 seamless switching module in one embodiment of the utility model has the shape shown in fig. 3, and the circuit is integrated in a product power supply design part by adopting the SMT, the ceramic copper clad laminate (DCB) and the eutectic soldering process technology, so that the integration level is improved, the size is reduced, the heat dissipation is fast, and the weight is light. The positive input terminal 1 of the circuit is used as a leading-out terminal IN + and is 3.0mm2X150mm red line, 3.0mm for taking the negative input and output terminals of the circuit as 2 as leading-OUT terminals IN- (OUT-)2X350mm black line, circuit switching control end 3 adopts 0.35mm as leading-out end FJD2X150mm red line, the positive output terminal 4 of the circuit is used as the leading-OUT terminal OUT + and 3.0mm is adopted2X150mm red line. The technical performance indexes of the seamless switching circuit taking SHQHDL001 as an example in this embodiment are shown in table 1:
technical performance index of SHQHDL001 seamless switching circuit in Table 1
Table 1 the product of this example can withstand a surge voltage of 100V for a duration of 100 mS; spike voltage 250V, duration 50 uS.
The utility model relates to a working principle of a seamless switching circuit with an anti-surge function; the lithium battery is controlled to supply power to the electric load, when the generator generates power normally, the battery pack is switched off to output power, and when the generator stops generating power or has faults, the battery is switched on to output power, so that the hybrid vehicle energy recovery system can be used. The input voltage of the peak suppression circuit, the surge protection circuit and the over-voltage and under-voltage protection circuit of the seamless switching mode circuit for filtering abnormal conditions is controlled by the switching circuit to output voltage to the electronic equipment.
The utility model relates to a working process of a seamless switching circuit with an anti-surge function, which comprises the following steps: the circuit adopts a series control mode, when the voltage of the FJD terminal is divided by a resistor R5 and a resistor R6, the divided voltage value is larger than the reference voltage of U2, a comparator U3A reverses, the output is high level, a transmission device Q3 is controlled to be switched on, the transmission device Q1 and a transmission device Q2 are controlled to be switched off by a surge controller U1, and no output of a product is achieved; when the voltage of the FJD terminal is divided by the resistor R5 and the resistor R6, the divided voltage value is smaller than the reference voltage of the trigger U2, the comparator U3A does not reverse, the output is low level, the transmission device Q3 is turned off, the surge controller U1 controls the transmission device Q1 and the transmission device Q2 to be turned on, the output result of the product is achieved, and the switching function is achieved; the input end and the output end of the surge protection circuit are connected into a corresponding TVS transient suppressor V1 to absorb spike pulses; the voltage is divided to a surge controller U1 through a sampling circuit resistor R4 and a resistor R13, the voltage drop at two ends of an N-MOSFET transmission device of a transmission device Q2 is controlled, the surge controller U1 limits and regulates output in an overvoltage process, and reverse current transient when a power supply fault, undervoltage or input short circuit is restrained to the maximum extent.
The utility model applies surge protection and peak suppression technology, realizes reverse connection prevention, surge protection and sharp pulse absorption, ensures the priority of alternating current power supply and the seamless switching of current, simultaneously improves the efficiency of electronic equipment, reduces power loss, has simpler circuit form and reliability, can be used in the environments of hybrid electric vehicles, industrial control and the like, such as the energy recovery control problem of hybrid electric vehicles, can effectively solve the problems of surge interference resistance and wide input voltage range work, is favorable for bringing good social, economic and ecological benefits to the reliable work of vehicle-mounted, airborne and other electronic equipment and the improvement of labor productivity, and has good popularization market and prospect.
Claims (7)
1. A seamless switching circuit with an anti-surge function is characterized by comprising a sampling circuit, a surge suppression driving circuit and a switching control circuit which are sequentially connected; the positive end of sampling circuit input is connected the positive end of power supply output, and surge suppression drive circuit connects TVS transient state suppressor, and switching control circuit connects FJD switching control end, and surge suppression drive circuit ground connection, power input output negative terminal links to each other with the ground terminal.
2. The seamless switching circuit with the surge protection function according to claim 1, wherein the switching control circuit comprises a trigger U, a comparator U3, a resistor R, a capacitor C and a transmission device Q, a pin 1 of the comparator U3 is respectively connected with the resistor R and the resistor R, a pin 2 of the amplifier U3 is connected with the resistor R, the resistor R is connected with the trigger U, a pin 1 of the trigger U is respectively connected with the resistor R and the resistor R, a pin 3 of the amplifier U3 is respectively connected with the resistor R and the resistor R, the resistor R is connected with the resistor R, a pin 4 of the amplifier U3 is connected with the resistor R, the resistor R and the resistor R are connected with the transmission device Q, and the transmission device Q is connected with the capacitor C through the resistor R and then grounded.
3. The seamless switching circuit with the surge protection function of claim 2, wherein the sampling circuit comprises a capacitor C4 and a capacitor C6, and a resistor R4 and a resistor R13 are connected in series after the capacitor C4 is connected in parallel with the capacitor C6.
4. The seamless switching circuit with the surge protection function according to claim 3, wherein the surge suppression driving circuit comprises a surge controller U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R13, a capacitor C1, a transmission device Q1 and a transmission device Q2, an OUT interface of the surge controller U1 and a SENS sensing signal terminal are connected with the resistor R4, DGATE is connected with the transmission device Q2 through the resistor R, SOURCE is connected with the transmission device Q2, HGATE is connected with the transmission device Q1 through the resistor R2, VCC is grounded after being connected with the resistor R1 and the capacitor C1, SHDN and UV are connected with the resistor R12, OV, FLT and EAOUT are grounded, TMR is connected with the capacitor C3, and FB is connected with the resistor R13; the input and output ends of the surge suppression driving circuit are merged into a corresponding TVS transient suppressor V1, the TVS transient suppressor V1 is connected with a unidirectional transient suppressor V2, and the unidirectional transient suppressor V2 is connected with a resistor R1.
5. The seamless switching circuit with surge protection function of claim 4, wherein the surge controller U1 comprises a timed current limiting circuit breaker.
6. The seamless switching circuit with surge protection function according to claim 4, wherein the surge controller U1 is of LTC4364 type.
7. The seamless switching circuit with surge protection function according to claim 4, wherein the transmission device Q1, the transmission device Q2 and the transmission device Q3 are all N-MOSFET tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121099960.XU CN216564618U (en) | 2021-05-21 | 2021-05-21 | Seamless switching circuit with anti-surge function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121099960.XU CN216564618U (en) | 2021-05-21 | 2021-05-21 | Seamless switching circuit with anti-surge function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216564618U true CN216564618U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121099960.XU Active CN216564618U (en) | 2021-05-21 | 2021-05-21 | Seamless switching circuit with anti-surge function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216564618U (en) |
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2021
- 2021-05-21 CN CN202121099960.XU patent/CN216564618U/en active Active
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