CN208369205U - Busbar voltage detection and protective module, Switching Power Supply control unit and switching power circuit - Google Patents
Busbar voltage detection and protective module, Switching Power Supply control unit and switching power circuit Download PDFInfo
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- CN208369205U CN208369205U CN201820780612.0U CN201820780612U CN208369205U CN 208369205 U CN208369205 U CN 208369205U CN 201820780612 U CN201820780612 U CN 201820780612U CN 208369205 U CN208369205 U CN 208369205U
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Abstract
The utility model provides a kind of busbar voltage detection and protective module, Switching Power Supply control unit; and a kind of switching power circuit, Switching Power Supply control unit include Switching Power Supply "ON" signal generating module, Switching Power Supply "Off" signal generator module, switch latch U125, drive module, busbar voltage sampling and keep module, above-mentioned busbar voltage detection and protective module or door U124；Through the busbar voltage after sampling compared with reference voltage, the detection and protection control of busbar voltage are realized.After electrifying startup before power tube switch, circuit detects whether busbar voltage occurs over-voltage or under-voltage automatically, the busbar voltage protection mechanism before realizing switch；After power tube enters normal switch, over-and under-voltage reference voltage range broadens automatically, realizes that busbar voltage protects lag function；Circuit, which is sampled by bus crest voltage with detecting, judges that overvoltage/undervoltage is protected, and realizes accurate detection and protection under different bus ripple voltages.
Description
Technical field
The utility model relates to technical field of integrated circuits, especially a kind of switching power circuit.
Background technique
With Internet of Things, the high speed development of integrated circuit technique, such as the performance of mobile phone, router internet-of-things terminal product
Obtain fast lifting, the magnitude of value is higher and higher, this to the Switching Power Supplies such as matched charger, adapter product performance,
The requirements such as price, reliability, upper machine qualification rate are also continuously improved.
It is used to meet in electronic equipment energy global range, just necessarily requires such as charger, adapter Switching Power Supply
Equipment is able to satisfy various countries' power standard.It is well known that the power standard of various countries is widely different in the world, some countries are to use
110V AC power supply, some countries are that also have country using voltages such as other voltages such as 120V using 220V AC power supply
Power supply, and the frequency of alternating current is also different, and the stability difference of gauze voltage is also especially big, instantaneous such as some countries
Gauze voltage can be more than 300V or more.In addition, Switching Power Supply product is to meet under the requirement for the cost performance being continuously improved, product is set
Meter surplus is constantly reducing, and is easy touching integrity problem.
Correspondingly, start to propose to increase Switching Power Supply product busbar voltage over voltage defencive function in the market.Early stage opens
Powered-down source busbar voltage detection and protection are to be realized by peripheral circuit, therefore the system cost of product is higher, volume compared with
Greatly.Hereafter, occur the switching power source chip of integrated switch power busbar voltage detection and protection in the market, but generally there is also
The problem of three classes typical case, especially with the size variation of load, detects voltage deviation very one is voltage detecting precision is not high
Greatly；The second is switch motion judges the overvoltage/undervoltage state of busbar voltage after occurring, there are security risks for this；The third is protection machine
It makes not perfect, such as fault latch function after protection and sluggish restores function.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of for Switching Power Supply bus
Voltage detecting and the circuit of protection, it is not high to solve busbar voltage detection precision, and especially detection voltage can be big with load current
It is small variation and variation issue；Busbar voltage is judged after solving the problems, such as switch motion generation, before realizing switch motion generation
Busbar voltage protection mechanism；It solves and perfect fault latch function and sluggish restores the protection mechanisms such as function.The utility model
The technical solution adopted is that:
A kind of busbar voltage detection and protective module, comprising: the first signal selector U201, second signal selector
U202, first comparator U203, the second comparator U204, over-and under-voltage control logic unit U205, d type flip flop U231, U206,
Or door U232, oscillator U207, the first time delay module U208, the second time delay module U209；
The low level selection signal input termination reference signal V211 of first signal selector U201, the first signal selector
The high level selection signal input termination reference signal V212 of U201；The signal behavior termination second of first signal selector U201
The output end of time delay module U209；The non-inverting input terminal of the output termination first comparator U203 of first signal selector U201；
The anti-phase input of first comparator U203 terminates busbar voltage voltage division signal VBUS_DIV, first comparator U203's
Output signal is UVP signal, one of input signal as over-and under-voltage control logic unit U205；
The low level selection signal input termination reference signal V214 of second signal selector U202, second signal selector
The high level selection signal input termination reference signal V215 of U202；The signal behavior termination second of second signal selector U202
The output end of time delay module U209；The inverting input terminal of the second comparator U204 of output termination of second signal selector U202；
The homophase input of second comparator U204 terminates busbar voltage voltage division signal VBUS_DIV, the second comparator U204's
Output signal is OVP signal, another input signal as over-and under-voltage control logic unit U205；
The input terminal of oscillator U207 connects electric enable signal EN, and output end is defeated to over-and under-voltage control logic unit U205
Clock signal clk out；
The input terminal of first time delay module U208 connects electric enable signal EN, the output termination of the first time delay module U208 the
The input terminal of two time delay module U209, and the reset terminal of d type flip flop U206 is connect, and connect the clock signal of d type flip flop U231
End；
The end D of an output termination d type flip flop U231 of over-and under-voltage control logic unit U205, and output signal OU_
signal；The reset terminal of d type flip flop U231 connects electric enable signal EN；
The another output of over-and under-voltage control logic unit U205 connects the clock signal terminal of d type flip flop U206, and defeated
Signal OU_CLK out；The D of d type flip flop U206 terminates high level；
The output end of d type flip flop U231 and the output end of d type flip flop U206 connect respectively or two input terminals of door U232；Or
Output end of the output end of door U232 as busbar voltage detection and protective module.
Specifically, over-and under-voltage control logic unit U205 includes: NOT gate U407, the first counter U401, rising edge inspection
Survey module U402, latch U403 or door U410, the second counter U411；
The output termination of the first comparator U203 or an input terminal of door U410；
The output end of the second comparator U204 meets the reset terminal of the first counter U401, Yi Jizhi by NOT gate U407
Connect the set end of latch U403；
The output end of the oscillator U207 is coupled with clock signal terminal and the second counting of the first counter U401
The clock signal terminal of device U411；
The output end of first counter U401 connects the input terminal of rising edge detection module U402；Rising edge detection module U402
Output terminate to the reset terminal of latch U403；The output end Q of latch U403 connects or another input terminal of door U410；Or
The reset terminal of the second counter U411 of output termination of door U410, and one as over-and under-voltage control logic unit U205 is defeated
The end D of d type flip flop U231 is terminated out；The output end of second counter U411 is another as over-and under-voltage control logic unit U205's
One output end, connects the clock signal terminal of d type flip flop U206.
A kind of Switching Power Supply control unit, including Switching Power Supply "ON" signal generating module, Switching Power Supply "Off" signal produce
Raw module, switch latch U125, drive module, busbar voltage sampling and keep module, above-mentioned busbar voltage detection and protection
Module or door U124；
The input terminal of busbar voltage sampling and keep module is for connecing busbar voltage sampling voltage division signal VBUS_IN, bus electricity
The output termination busbar voltage detection and protective module of sampling and keep module are pressed, it is female to busbar voltage detection and protective module output
Line voltage voltage division signal VBUS_DIV；One end of the output termination or door U124 of busbar voltage detection and protective module；
The input terminal of Switching Power Supply "ON" signal generating module is used to connect the auxiliary winding partial pressure feedback signal FB of transformer,
The set end of the output termination switch lock storage U125 of Switching Power Supply "ON" signal generating module；
The input terminal of Switching Power Supply "Off" signal generator module is used to connect the sampled signal of primary current sampling resistor anode
CS, the output termination of Switching Power Supply "Off" signal generator module or the other end of door U124；
Or the reset terminal of the output termination switch lock storage U125 of door U124；
The input terminal of the Q termination drive module of latch U125 is switched, the output end of drive module is for connecing power tube
The switch control terminal of Q131.
A kind of switching power circuit, comprising: input rectifying filter circuit, above-mentioned Switching Power Supply control unit, transformer
T106, output rectifier and filter, RCD absorbing circuit, power tube Q131, primary current sampling resistor Rcs, busbar voltage detection
Resistance R103, R104, auxiliary winding divide feed circuit；
The primary side winding different name end of the positive output termination transformer T106 of input rectifying filter circuit, negative output terminate primary side
Ground；
Concatenated busbar voltage detection resistance R103, R104 are with being connected to positive output end and the primary side of input rectifying filter circuit
Between, busbar voltage sampling voltage division signal VBUS_IN is obtained from series resistance R103, R104 tie point, busbar voltage is connected to and adopts
The input terminal of sample holding module；
RCD absorbing circuit connects at the both ends of transformer T106 primary side winding；
The current input terminal of transformer T106 primary side winding termination power tube Q131 of the same name, the electric current output of power tube Q131
The one end primary current sampling resistor Rcs is terminated, and is connected to the input terminal of Switching Power Supply "Off" signal generator module, primary current
Another termination primary side of sampling resistor Rcs；
The vice-side winding of transformer T106 connects output rectifier and filter, exports direct current by output rectifier and filter
Pressure；
The auxiliary winding two of transformer T106 terminates auxiliary winding and divides feed circuit；Auxiliary winding divides feed circuit packet
Two concatenated resistance R112, R113 are included, obtain auxiliary winding partial pressure from the tie point of this two concatenated resistance R112, R113
Feedback signal FB is connected to the input terminal of Switching Power Supply "ON" signal generating module.
Utility model has the advantages that the utility model realizes overvoltage/undervoltage by sampling and detecting bus crest voltage
Protection, solve the problems, such as busbar voltage because caused by ripple difference under different output load conditions detection accuracy it is not high.
Detailed description of the invention
Fig. 1 is the utility model for Switching Power Supply busbar voltage detection and the circuit diagram of protection.
Fig. 2 is the busbar voltage detection and protective module schematic diagram of the utility model.
Fig. 3 is the busbar voltage detection of the utility model and the clock signal figure of defencive function.
Fig. 4 is the over-and under-voltage control logic unit schematic diagram of the utility model.
Specific embodiment
Below with reference to specific drawings and examples, the utility model is described in further detail.
As shown in Figure 1, important core is internal institute the utility model proposes a kind of Switching Power Supply control unit 120
The busbar voltage detection and protective module 122 for including；
As shown in Fig. 2, busbar voltage detection and protective module 122, comprising: the first signal selector U201, second signal
Selector U202, first comparator U203, the second comparator U204, over-and under-voltage control logic unit U205, d type flip flop
U231, U206 or door U232, oscillator U207, the first time delay module U208, the second time delay module U209；
The low level selection signal input termination reference signal V211 of first signal selector U201, the first signal selector
The high level selection signal input termination reference signal V212 of U201；The signal behavior termination second of first signal selector U201
The output end of time delay module U209；The non-inverting input terminal of the output termination first comparator U203 of first signal selector U201；
The anti-phase input of first comparator U203 terminates busbar voltage voltage division signal VBUS_DIV, first comparator U203's
Output signal is UVP signal, one of input signal as over-and under-voltage control logic unit U205；
The low level selection signal input termination reference signal V214 of second signal selector U202, second signal selector
The high level selection signal input termination reference signal V215 of U202；The signal behavior termination second of second signal selector U202
The output end of time delay module U209；The inverting input terminal of the second comparator U204 of output termination of second signal selector U202；
The homophase input of second comparator U204 terminates busbar voltage voltage division signal VBUS_DIV, the second comparator U204's
Output signal is OVP signal, another input signal as over-and under-voltage control logic unit U205；
The input terminal of oscillator U207 connects electric enable signal EN, and output end is defeated to over-and under-voltage control logic unit U205
Clock signal clk out；
The input terminal of first time delay module U208 connects electric enable signal EN, the output termination of the first time delay module U208 the
The input terminal of two time delay module U209, and the reset terminal of d type flip flop U206 is connect, and connect the clock signal of d type flip flop U231
End；
The end D of an output termination d type flip flop U231 of over-and under-voltage control logic unit U205, and output signal OU_
signal；The reset terminal of d type flip flop U231 connects electric enable signal EN；
The another output of over-and under-voltage control logic unit U205 connects the clock signal terminal of d type flip flop U206, and defeated
Signal OU_CLK out；The D of d type flip flop U206 terminates high level；
The output end of d type flip flop U231 and the output end of d type flip flop U206 connect respectively or two input terminals of door U232；Or
Output end of the output end of door U232 as busbar voltage detection and protective module 122；
As shown in figure 4, over-and under-voltage control logic unit U205 includes: NOT gate U407, the first counter U401, rising edge
Detection module U402, latch U403 or door U410, the second counter U411；
The output termination of the first comparator U203 or an input terminal of door U410；
The output end of the second comparator U204 meets the reset terminal of the first counter U401, Yi Jizhi by NOT gate U407
Connect the set end of latch U403；
The output end of the oscillator U207 is coupled with clock signal terminal and the second counting of the first counter U401
The clock signal terminal of device U411；
The output end of first counter U401 connects the input terminal of rising edge detection module U402；Rising edge detection module U402
Output terminate to the reset terminal of latch U403；The output end Q of latch U403 connects or another input terminal of door U410；Or
The reset terminal of the second counter U411 of output termination of door U410, and one as over-and under-voltage control logic unit U205 is defeated
The end D of d type flip flop U231 is terminated out；The output end of second counter U411 is another as over-and under-voltage control logic unit U205's
One output end, connects the clock signal terminal of d type flip flop U206；
A kind of Switching Power Supply control unit 120, as shown in Figure 1, including Switching Power Supply "ON" signal generating module 121, opening
Powered-down source "Off" signal generator module 123, switch latch U125, drive module 126, busbar voltage sampling and keep module 127,
Busbar voltage detection and protective module 122 or door U124；
The input terminal of busbar voltage sampling and keep module 127 is for connecing busbar voltage sampling voltage division signal VBUS_IN, bus
Voltage sample keeps the output termination busbar voltage detection and protective module 122 of module 127, to busbar voltage detection and protection mould
Block 122 exports busbar voltage voltage division signal VBUS_DIV；The output termination or door U124 of busbar voltage detection and protective module 122
One end；
The input terminal of Switching Power Supply "ON" signal generating module 121 is for connecing auxiliary winding partial pressure feedback signal FB, switch
The set end of the output termination switch lock storage U125 of power supply "ON" signal generating module 121；
The input terminal of Switching Power Supply "Off" signal generator module 123 is used to connect the sampling letter of primary current sampling resistor anode
Number CS, the output termination of Switching Power Supply "Off" signal generator module 123 or the other end of door U124；
Or the reset terminal of the output termination switch lock storage U125 of door U124；
The input terminal of the Q termination drive module 126 of latch U125 is switched, the output end of drive module 126 is for connecing function
The switch control terminal of rate pipe Q131；
It is a kind of for Switching Power Supply busbar voltage detection and the circuit of protection, as shown in Figure 1, comprising: input rectifying filtering
Circuit, Switching Power Supply control unit 120, transformer T106, output rectifier and filter 107, RCD absorbing circuit 109, power tube
Q131, primary current sampling resistor Rcs, busbar voltage detection resistance R103, R104, auxiliary winding divide feed circuit 108；
The primary side winding different name end of the positive output termination transformer T106 of input rectifying filter circuit, negative output terminate primary side
Ground；Input rectifying filter circuit mainly by Fig. 1 rectifier bridge D101 and filter capacitor C102 constitute；
Concatenated busbar voltage detection resistance R103, R104 are with being connected to positive output end and the primary side of input rectifying filter circuit
Between, busbar voltage sampling voltage division signal VBUS_IN is obtained from series resistance R103, R104 tie point, busbar voltage is connected to and adopts
The input terminal of sample holding module 127；
RCD absorbing circuit 109 connects at the both ends of transformer T106 primary side winding；
The current input terminal of transformer T106 primary side winding termination power tube Q131 of the same name, the electric current output of power tube Q131
The one end primary current sampling resistor Rcs is terminated, and is connected to the input terminal of Switching Power Supply "Off" signal generator module 123, it is primary
Another termination primary side of current sampling resistor Rcs；
The vice-side winding of transformer T106 connects output rectifier and filter 107, is exported by output rectifier and filter straight
Galvanic electricity pressure；Output rectifier and filter 107 includes diode D102, filter capacitor C110, the resistance R111 of Fig. 1；This part is
Mature circuit, repeats no more；
The auxiliary winding two of transformer T106 terminates auxiliary winding and divides feed circuit 108；Auxiliary winding partial pressure feedback electricity
Road 108 includes two concatenated resistance R112, R113, is assisted from the tie point of this two concatenated resistance R112, R113
Winding divides feedback signal FB, is connected to the input terminal of Switching Power Supply "ON" signal generating module 121；
The working principle of the utility model introduced below；
Switching Power Supply control unit 120 is the core of the utility model；NMOS tube can be used in power tube Q131, drain,
Source electrode is respectively as current input terminal and current output terminal, and grid is as switch control terminal；NPN triode can also be used；
For the application principle of Switching Power Supply busbar voltage detection and the circuit of protection referring to Fig. 1, auxiliary winding partial pressure is anti-
Feedback signal FB is connected to the input terminal of Switching Power Supply "ON" signal generating module 121, Switching Power Supply "ON" signal generating module 121
Switching frequency is calculated according to the height of auxiliary winding partial pressure feedback signal FB, and exports leading for "ON" signal control power tube Q131
Logical, when the output signal of Switching Power Supply "ON" signal generating module 121 is by low get higher, switch latch U125 is triggered, defeated
Signal ON is high level out, and ON high level state is kept to be reset until switch latch U125, switchs the defeated of latch 125
After the signal amplification that signal ON passes through drive module 126 out, the conducting of driving power pipe Q131.
Similar, the shutdown of driving power pipe Q131 is controlled by the reset to switch lock storage U125, switch lock
The reset signal of storage U125 is a combination signal, the output signal including Switching Power Supply "Off" signal generator module 123, with
And the output signal of busbar voltage detection and protective module 122.
The output signal of Switching Power Supply "Off" signal generator module 123 is controlled by the pressure drop of primary current sampling resistor Rcs,
After power tube Q131 conducting, primary current increases, and the pressure drop of primary current sampling resistor Rcs is consequently increased, when the pressure drop of Rcs
When reaching a reference value of internal preset, the output signal of Switching Power Supply "Off" signal generator module 123 is got higher by low, and switch latches
Device U125 is reset；123 Cycle by Cycle output reset signal of Switching Power Supply "Off" signal generator module.
Busbar voltage detection and protective module 122 are by carrying out busbar voltage voltage division signal VBUS_DIV and reference signal
Compare, when busbar voltage voltage division signal VBUS_DIV is fallen in reference signal window ranges, busbar voltage detection and protective module
122 output low levels, the low level signal do not control the shutdown of power tube Q131；As denominator line voltage voltage division signal VBUS_DIV
It falls in outside reference signal window ranges, busbar voltage detection and protective module 122 export high level, which controls immediately
The shutdown of power tube Q131 processed.Further, the reset of switch trigger U125 has higher priority (i.e. reset terminal than set
With set end simultaneously high level when, execute homing action), after busbar voltage detection and protective module 122 export high level, power
Pipe Q131 conducting will no longer be triggered.
The function of busbar voltage detection and protective module 122 is referring to fig. 2；After electrifying startup, enable signal EN is got higher by low,
Oscillator U207 starts to work, and exports clock signal, the timing for busbar voltage protection detection.First U208 pairs of time delay module
The enable signal EN of input carries out 2mS delay, i.e., enable signal EN by it is low get higher 2mS after, the first time delay module U208's is defeated
Signal dly1 is got higher by low out；Second time delay module U209 to input signal dly1 carry out 100 μ S delay, i.e., signal dly by
It is low get higher 100uS after, the output signal dly2 of the second time delay module U209 is got higher by low.When the delay of the first time delay module U208
It is long usually to select 1ms~20ms, it is 2ms in this example；The delay duration of second time delay module U209 does not have particular requirement, such as
From tens of μ S to several ms.
Signal V211, V212, V213, V214 are internal reference signal；Reference signal V211, V212 is as busbar voltage
Under-voltage judgement benchmark, wherein reference signal V211 is higher than reference signal V212；Reference signal V213, V214 is as busbar voltage mistake
Pressure judges benchmark, and wherein reference signal V215 is higher than reference signal V214；Reference signal V214 is higher than V211；As shown in Figure 3；The
The output signal dly2 of two time delay module U209 alternatively signal；When selection signal dly2 is low level, the choosing of the first signal
It selects device U201 selection reference signal V211, second signal selector U202 and selects reference signal V214；When selection signal dly2 is
When high level, the first signal selector U201 selects reference signal V212, second signal selector U202 to select reference signal
V215；As a result, after selection signal dly24 is by low get higher, the benchmark window of over-and under-voltage protection responsively increases.
First comparator U203 is used for the under-voltage detection of busbar voltage, and the homophase input of the comparator terminates the first signal behavior
The anti-phase input of the output end of device U201, the comparator terminates busbar voltage voltage division signal VBUS_DIV, when the first comparator
When the output signal of U203 is by low get higher, indicate that busbar voltage is under-voltage.
Similar, the second comparator U204 is detected for busbar voltage over-voltage, and the homophase input of the comparator terminates bus
Voltage signal VBUS_DIV, the output end of the anti-phase input termination second signal selector U202 of the comparator, when the ratio
When output signal compared with device U204 is by low get higher, busbar voltage over-voltage is indicated.
The output of comparator U203 and U204 are coupled with over-and under-voltage control logic unit U205, as comparator U203 and
The output of U204 it is any be high level when, the output signal OU_signal of over-and under-voltage control logic unit U205 is got higher by low,
Meanwhile over-and under-voltage control logic unit U205 carries out timing to the high level lasting time of signal OU_signal, works as signal
The high level of OU_signal is continued above default timing duration, the output signal OU_ of over-and under-voltage control logic unit U205
CLK is got higher by low；In the timing course of default timing duration, if low level occurs in signal OU_signal, timing is clear
Zero, waiting signal OU_signal gets higher reclocking after level；Default timing duration need to be greater than 1 power frequency period, select in this example
Select 120mS.
D type flip flop U231 latches busbar voltage over-and under-voltage detection signal when powering on；The D of d type flip flop U231 was terminated
Press the output signal OU_signal of under-voltage control logic unit U205, clock signal termination the first delay mould of d type flip flop U231
The output signal dly1 of block U208, the reset terminal of d type flip flop U231 connect electric enable signal EN.It powers on before enabling, d type flip flop
U231 resets, and the output end Q of d type flip flop U231 is zero.It powers on after enabling, the output of over-and under-voltage control logic unit U205 is believed
Number OU_signal can change according to the output signal of comparator U203 and U204, when comparator U203 and U204 output are all
When low level, signal OU_signal is low level, when it is high level that comparator U203 and U204 output are any, signal OU_
Signal is high level.After powering on enabled delay 2mS, the output signal dly1 of the first time delay module U208 is got higher by low, will be believed
Number OU_signal is latched into d type flip flop U231, and when the output of d type flip flop U231 is high level, indication circuit is when powering on
It has been detected by busbar voltage and over-voltage or under-voltage occurs, the high level lasts for reset above-mentioned latch U125 shields power tube
The conducting of Q131, the state will continue to reset maintained until resetting after re-powering.
D type flip flop U206 is latched in the busbar voltage over-and under-voltage signal occurred in the Switching Power Supply course of work.D type flip flop
The D of U206 terminates high level, and the clock signal terminal of d type flip flop U206 connects the output signal of over-and under-voltage control logic unit U205
OU_CLK.When powering on, if busbar voltage voltage division signal VBUS_DIV is fallen in the window ranges of benchmark, OU_signal
Signal is zero, and the output of d type flip flop U231 is also zero, and circuit initially enters normal switching process, meanwhile, in the second delay mould
After the delay of block 209, increase the window ranges of benchmark by signal dly2.In the circuit course of work, when triggering
Pressure or when under-voltage protection, which can't be triggered immediately, but carrying out 120mS(is default timing duration) meter
When come shield because busbar voltage disturbance due to bring erroneous judgement problem.In the timing duration of this 120mS, when over-voltage or under-voltage
Lasting to occur, over-and under-voltage control logic unit U205 its output signal OU_CLK after the completion of 120mS timing is got higher by low, will
High level signal is latched into d type flip flop U206, indication circuit detect during the work time busbar voltage occur over-voltage or
Under-voltage, d type flip flop U206 exports the high level meeting above-mentioned latch U125 of lasts for reset to shield the conducting of power tube Q131, the shape
State will continue to reset maintained until resetting after re-powering.
Busbar voltage detection and protection timing are as shown in Figure 3 when powering on.In Fig. 3 signal include: vdd voltage signal 302, on
Output signal dly2, the mother of electric enable signal EN, the output signal dly1 of the first time delay module U208, the second time delay module U209
Line voltage voltage division signal VBUS_DIV, over-voltage benchmark 342 and under-voltage benchmark 343；Over-voltage benchmark 342 includes reference signal V214
With two sections of V215, under-voltage benchmark 343 include two sections of reference signal V211 and V212.
After system electrification, after vdd voltage is gradually lifted to UVLO threshold voltage, powers on enable signal EN and got higher by low, mistake
Under-voltage reference voltage is pressed also to establish therewith, whether circuit real-time detection busbar voltage voltage division signal VBUS_DIV falls in datum windows
In mouthful；After the system delay of 2mS, signal dly1 is got higher by low, and confirms that busbar voltage voltage division signal VBUS_DIV falls in base
After in quasi- window, circuit initially enters normal work, and signal dly2 is got higher by low after 100uS delay, and benchmark window increases.
As shown in figure 4, the first counter U401 is cleared, latch after the high level pulse OVP of over-voltage detection is generated
U403 is set or the output of door U410 is high level, and the second counter U411 starts from scratch timing, the second counter U411's
The default timing duration (being greater than a power frequency period) that time-count cycle is 120ms；After signal OVP returns to low level, the first meter
Number device U401 start from scratch timing, are set as a power frequency half wave cycles time-count cycle between two power frequency half wave cycles, when
Signal OVP regenerates high level pulse in adjacent next power frequency half wave cycles, then after the first counter U401 is reset
Start from scratch again timing, at this moment or the output of door U410 is continuously high level, the second counter U411 keeping count；When
Signal OVP does not generate high level pulse in adjacent next power frequency half wave cycles, then the first counter U401 is not clear
Zero, after the timing time (a power frequency half wave cycles are between two power frequency half wave cycles) of setting reaches, export one
By the low signal got higher, rising edge detection module U402 generates a high level pulse, reset latch U403, at this time or door
The output of U410 is lower, and the second counter U411 is cleared, and protects reclocking.
Under-voltage protection is relatively easy, and the timing course of the second counter U411 is directly related to the state of signal UVP, works as letter
When number UVP is permanent High level, the second counter U411 enters protection after completing timing.
The utility model is by comparing the voltage division signal of busbar voltage and the size relation of reference voltage, to realize bus electricity
The detection and protection control of pressure.After electrifying startup, first compare whether bus voltage division signal falls in over-voltage, under-voltage benchmark window ranges
Interior, this process is completed within the 2mS time after the power-up；When busbar voltage voltage division signal falls in over-voltage, under-voltage benchmark window
In range, start output switching signal after the delay of 2mS time, while increasing over-voltage, under-voltage benchmark window ranges, realizes
The sluggish of protection restores function, in switching process, if the continuous 120mS of busbar voltage voltage division signal is more than the mistake after increasing
Pressure, under-voltage benchmark window ranges, over voltage protection signal are latched, and switching signal stops, and restarts after VDD power down；This
It outside, is more than over-voltage, under-voltage benchmark window ranges within busbar voltage voltage division signal 2mS time after the power-up, over voltage is protected
Shield signal is directly latched, no longer output switching signal, is restarted after VDD power down, and the busbar voltage before realizing switch is protected
Protection mechanism.
It should be noted last that the above specific embodiment is only to illustrate the technical solution of the utility model rather than limits
System, although the utility model is described in detail referring to example, those skilled in the art should understand that, it can be right
The technical solution of the utility model is modified or replaced equivalently, without departing from the spirit and model of technical solutions of the utility model
It encloses, should all cover in the scope of the claims of the utility model.
Claims (10)
1. a kind of busbar voltage detection and protective module (122) characterized by comprising the first signal selector U201, second
Signal selector U202, first comparator U203, the second comparator U204, over-and under-voltage control logic unit U205, d type flip flop
U231, U206 or door U232, oscillator U207, the first time delay module U208, the second time delay module U209；
Low level selection signal input termination the reference signal V211, the first signal selector U201 of first signal selector U201
High level selection signal input termination reference signal V212；The second delay of signal behavior termination of first signal selector U201
The output end of module U209；The non-inverting input terminal of the output termination first comparator U203 of first signal selector U201；
The anti-phase input of first comparator U203 terminates busbar voltage voltage division signal VBUS_DIV, the output of first comparator U203
Signal is UVP signal, one of input signal as over-and under-voltage control logic unit U205；
Low level selection signal input termination the reference signal V214, second signal selector U202 of second signal selector U202
High level selection signal input termination reference signal V215；The second delay of signal behavior termination of second signal selector U202
The output end of module U209；The inverting input terminal of the second comparator U204 of output termination of second signal selector U202；
The homophase input of second comparator U204 terminates busbar voltage voltage division signal VBUS_DIV, the output of the second comparator U204
Signal is OVP signal, another input signal as over-and under-voltage control logic unit U205；
The input terminal of oscillator U207 connects electric enable signal EN, when output end is exported to over-and under-voltage control logic unit U205
Clock signal CLK；
The input terminal of first time delay module U208 connects electric enable signal EN, and the output termination second of the first time delay module U208 is prolonged
When module U209 input terminal, and connect the reset terminal of d type flip flop U206, and connect the clock signal terminal of d type flip flop U231；
The end D of an output termination d type flip flop U231 of over-and under-voltage control logic unit U205, and output signal OU_
signal；The reset terminal of d type flip flop U231 connects electric enable signal EN；
The another output of over-and under-voltage control logic unit U205 connects the clock signal terminal of d type flip flop U206, and exports letter
Number OU_CLK；The D of d type flip flop U206 terminates high level；
The output end of d type flip flop U231 and the output end of d type flip flop U206 connect respectively or two input terminals of door U232；Or door
Output end of the output end of U232 as busbar voltage detection and protective module (122).
2. busbar voltage detection as described in claim 1 and protective module (122), which is characterized in that
Over-and under-voltage control logic unit U205 include: NOT gate U407, the first counter U401, rising edge detection module U402,
Latch U403 or door U410, the second counter U411；
The output termination of the first comparator U203 or an input terminal of door U410；
The output end of the second comparator U204 connects the reset terminal of the first counter U401 by NOT gate U407, and directly connects
The set end of latch U403；
The output end of the oscillator U207 is coupled with the clock signal terminal and the second counter of the first counter U401
The clock signal terminal of U411；
The output end of first counter U401 connects the input terminal of rising edge detection module U402；Rising edge detection module U402's is defeated
The reset terminal of latch U403 is terminated to out；The output end Q of latch U403 connects or another input terminal of door U410；Or door
The reset terminal of the second counter U411 of output termination of U410, and an output as over-and under-voltage control logic unit U205
Terminate the end D of d type flip flop U231；The output end of second counter U411 is another as over-and under-voltage control logic unit U205's
A output end connects the clock signal terminal of d type flip flop U206.
3. busbar voltage detection as described in claim 1 and protective module (122), which is characterized in that
The delay duration of first time delay module U208 selects 1ms~20ms.
4. busbar voltage detection as described in claim 1 and protective module (122), which is characterized in that
Reference signal V211, V212 is as the under-voltage judgement benchmark of busbar voltage, and wherein reference signal V211 is higher than reference signal
V212；Reference signal V213, V214 judges benchmark as busbar voltage over-voltage, and wherein reference signal V215 is higher than reference signal
V214；Reference signal V214 is higher than V211；The output signal dly2 of second time delay module U209 alternatively signal；When selection is believed
When number dly2 is low level, the first signal selector U201 selects reference signal V211, second signal selector U202 to select base
Calibration signal V214；When selection signal dly2 is high level, the first signal selector U201 selects reference signal V212, the second letter
Number selector U202 selects reference signal V215；As a result, after selection signal dly24 is by low get higher, the base of over-and under-voltage protection
Quasi- window responsively increases.
5. busbar voltage detection as described in claim 1 and protective module (122), which is characterized in that
When it is high level that the output of comparator U203 and U204 are any, the output signal of over-and under-voltage control logic unit U205
OU_signal is got higher by low, meanwhile, when over-and under-voltage control logic unit U205 continues the high level of signal OU_signal
Between carry out timing, when the high level of signal OU_signal is continued above default timing duration, over-and under-voltage control logic unit
The output signal OU_CLK of U205 is got higher by low；In the timing course of default timing duration, if signal OU_signal occurs
Low level, then timing is reset, and waiting signal OU_signal gets higher reclocking after level；Default timing duration need to be greater than 1 work
The frequency period.
6. busbar voltage detection as claimed in claim 2 and protective module (122), which is characterized in that
It is set as a power frequency half wave cycles time-count cycle of first counter U401 between two power frequency half wave cycles；Second
It is set greater than a power frequency period time-count cycle of counter U411.
7. a kind of Switching Power Supply control unit (120), which is characterized in that including Switching Power Supply "ON" signal generating module (121),
Switching Power Supply "Off" signal generator module (123), switch latch U125, drive module (126), busbar voltage sampling keep mould
Block (127), busbar voltage detection such as according to any one of claims 1 to 6 and protective module (122) or door U124；
The input terminal of busbar voltage sampling and keep module (127) is for connecing busbar voltage sampling voltage division signal VBUS_IN, bus electricity
The output termination busbar voltage detection and protective module (122) for pressing sampling and keep module (127), to busbar voltage detection and protection
Module (122) exports busbar voltage voltage division signal VBUS_DIV；The output of busbar voltage detection and protective module (122) terminate or
One end of door U124；
The input terminal of Switching Power Supply "ON" signal generating module (121) is used to connect the auxiliary winding partial pressure feedback signal of transformer
FB, the set end of the output termination switch lock storage U125 of Switching Power Supply "ON" signal generating module (121)；
The input terminal of Switching Power Supply "Off" signal generator module (123) is used to connect the sampled signal of primary current sampling resistor anode
CS, the output termination of Switching Power Supply "Off" signal generator module (123) or the other end of door U124；
Or the reset terminal of the output termination switch lock storage U125 of door U124；
The input terminal of Q termination drive module (126) of latch U125 is switched, the output end of drive module (126) is for connecing function
The switch control terminal of rate pipe Q131.
8. Switching Power Supply control unit (120) as claimed in claim 7, which is characterized in that
Busbar voltage detection and protective module (122) are by comparing busbar voltage voltage division signal VBUS_DIV with reference signal
Compared with, when busbar voltage voltage division signal VBUS_DIV is fallen in reference signal window ranges, busbar voltage detection and protective module
(122) low level is exported, which does not control the shutdown of power tube Q131；As denominator line voltage voltage division signal VBUS_
DIV is fallen in outside reference signal window ranges, and busbar voltage detection and protective module (122) export high level, the high level signal
The shutdown of power tube Q131 is immediately controlled.
9. Switching Power Supply control unit (120) as claimed in claim 7, which is characterized in that
The reset of switch trigger U125 has higher priority than set.
10. a kind of switching power circuit characterized by comprising input rectifying filter circuit, as described in claim 7,8 or 9
Switching Power Supply control unit (120), transformer T106, output rectifier and filter (107), RCD absorbing circuit (109), function
Rate pipe Q131, primary current sampling resistor Rcs, busbar voltage detection resistance R103, R104, auxiliary winding divide feed circuit
(108)；
The primary side winding different name end of the positive output termination transformer T106 of input rectifying filter circuit, negative output is with terminating primary side；
Concatenated busbar voltage detection resistance R103, R104 with being connected to positive output end and the primary side of input rectifying filter circuit it
Between, busbar voltage sampling voltage division signal VBUS_IN is obtained from series resistance R103, R104 tie point, is connected to busbar voltage sampling
Keep the input terminal of module (127)；
RCD absorbing circuit (109) connects at the both ends of transformer T106 primary side winding；
The current input terminal of transformer T106 primary side winding termination power tube Q131 of the same name, the current output terminal of power tube Q131 connect
The one end primary current sampling resistor Rcs, and it is connected to the input terminal of Switching Power Supply "Off" signal generator module (123), primary electrical
With flowing another termination primary side of sampling resistor Rcs；
The vice-side winding of transformer T106 connects output rectifier and filter (107), exports direct current by output rectifier and filter
Voltage；
The auxiliary winding two of transformer T106 terminates auxiliary winding partial pressure feed circuit (108)；Auxiliary winding divides feed circuit
(108) it obtains auxiliary winding and divides feedback signal FB, be connected to the input terminal of Switching Power Supply "ON" signal generating module (121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820780612.0U CN208369205U (en) | 2018-05-24 | 2018-05-24 | Busbar voltage detection and protective module, Switching Power Supply control unit and switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820780612.0U CN208369205U (en) | 2018-05-24 | 2018-05-24 | Busbar voltage detection and protective module, Switching Power Supply control unit and switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208369205U true CN208369205U (en) | 2019-01-11 |
Family
ID=64929873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820780612.0U Withdrawn - After Issue CN208369205U (en) | 2018-05-24 | 2018-05-24 | Busbar voltage detection and protective module, Switching Power Supply control unit and switching power circuit |
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| Country | Link |
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| CN (1) | CN208369205U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565843A (en) * | 2018-05-24 | 2018-09-21 | 无锡硅动力微电子股份有限公司 | Busbar voltage detection and protection module, Switching Power Supply control unit and for Switching Power Supply busbar voltage detection and the circuit of protection |
| CN110138376A (en) * | 2019-05-21 | 2019-08-16 | 电子科技大学 | A kind of bad row protection circuit applied to non-refrigerating infrared focal plane reading circuit |
| CN110224373A (en) * | 2019-07-15 | 2019-09-10 | 合肥惠科金扬科技有限公司 | A kind of overvoltage crowbar and over-pressure safety device |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN112730956A (en) * | 2020-12-18 | 2021-04-30 | 杭州士兰微电子股份有限公司 | Switching power supply, voltage detection circuit and voltage detection method thereof |
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2018
- 2018-05-24 CN CN201820780612.0U patent/CN208369205U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108565843A (en) * | 2018-05-24 | 2018-09-21 | 无锡硅动力微电子股份有限公司 | Busbar voltage detection and protection module, Switching Power Supply control unit and for Switching Power Supply busbar voltage detection and the circuit of protection |
| CN110138376A (en) * | 2019-05-21 | 2019-08-16 | 电子科技大学 | A kind of bad row protection circuit applied to non-refrigerating infrared focal plane reading circuit |
| CN110138376B (en) * | 2019-05-21 | 2023-02-24 | 电子科技大学 | Bad row protection circuit applied to uncooled infrared focal plane reading circuit |
| CN110224373A (en) * | 2019-07-15 | 2019-09-10 | 合肥惠科金扬科技有限公司 | A kind of overvoltage crowbar and over-pressure safety device |
| CN110224373B (en) * | 2019-07-15 | 2021-09-28 | 重庆惠科金扬科技有限公司 | Overvoltage protection circuit and overvoltage protection device |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN112730956A (en) * | 2020-12-18 | 2021-04-30 | 杭州士兰微电子股份有限公司 | Switching power supply, voltage detection circuit and voltage detection method thereof |
| CN112730956B (en) * | 2020-12-18 | 2023-11-21 | 杭州士兰微电子股份有限公司 | Switching power supply, voltage detection circuit thereof and voltage detection method |
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