CN109905042A - A kind of power-supply device and its power circuit - Google Patents

Abstract

The present disclosure proposes a kind of power-supply device and its power circuits, the High Level AC Voltage of access is converted to high voltage direct current by high input voltage module by the power circuit, prime power control module samples the coupling output voltage at the ancillary coil end of transformer, transformer is controlled according to sampled result, and rechargeable energy is electrically generated according to high voltage direct current, secondary commutation control module generates charging voltage according to rechargeable energy, and charges after rectifying to charging voltage to load；Secondary commutation control module is also used to detect the output voltage in charging process, and result will test by transformer and feed back to prime power control module, prime power control module is according to testing result adjusted the input power of transformer, so that power circuit can to load effectively charging while circuit structure it is simple, to reduce the volume of power circuit, component number and the electronic waste of generation and at low cost.

Description

A kind of power-supply device and its power circuit

Technical field

This disclosure relates to power technique fields more particularly to a kind of power-supply device and its power circuit.

Background technique

In recent years, with the performance boost of the portable terminals such as mobile phone, tablet computer and quickly universal, matching electricity Explosive growth, such as the power supply of the portable terminal based on 5V1A and 5V2A is also presented in source device.

However, with the increase of charge power, the power circuit scheme more sophisticated of power-supply device, and with power circuit Scheme more sophisticated, the volume of power circuit increases, component number increases and increased costs, and can generate more electricity Sub- rubbish.

In conclusion that there are volumes is big, component number is more, the at high cost and electronics rubbish that generates for existing power circuit Problem more than rubbish.

Summary of the invention

The disclosure is designed to provide a kind of power-supply device and its power circuit, exists to solve existing power circuit Volume is big, component number is more, the problem more than at high cost and electronic waste.

The disclosure is achieved in that disclosure first aspect provides a kind of power circuit, and the power circuit includes:

High input voltage module, prime power control module, transformer and secondary commutation control module；

The connection of the primary coil of the high input voltage module and transformer, the prime power control module and the transformation The primary coil of device is connected with ancillary coil, and the secondary coil of the transformer is connect with the secondary commutation control module, institute It states secondary commutation control module and load connects；

The High Level AC Voltage of access is converted to high voltage direct current by the high input voltage module, and the prime power controls mould Block samples the coupling output voltage at the ancillary coil end of the transformer, controls the transformer root according to sampled result It is electrically generated rechargeable energy according to the high voltage direct current, the secondary commutation control module generates charging electricity according to the rechargeable energy Pressure, and charge after being rectified to the charging voltage to the load；The secondary commutation control module is also used to charging Output voltage in the process is detected, and be will test result by the transformer and fed back to the prime power control mould Block, the prime power control module are adjusted according to input power of the testing result to the transformer.

Disclosure second aspect provides a kind of power-supply device, and the power-supply device includes the electricity of power supply described in first aspect Road.

The present disclosure proposes a kind of power-supply device and its power circuit, the power circuit by using high input voltage module, Prime power control module, transformer and secondary commutation control module, so that high input voltage module is by the high-voltage alternating of access Electricity is converted to high voltage direct current, and prime power control module adopts the coupling output voltage at the ancillary coil end of transformer Sample controls transformer according to sampled result and is electrically generated rechargeable energy according to high voltage direct current, and secondary commutation control module is according to charging Energy generates charging voltage, and charges after rectifying to charging voltage to load；Secondary commutation control module is also used to filling Output voltage in electric process is detected, and be will test result by transformer and fed back to prime power control module, primary Power control module is according to testing result adjusted the input power of transformer, so that power circuit can have load Circuit structure is simple while effect charging, to reduce the volume of power circuit, component number and the electronics of generation rubbish Rubbish and at low cost.

Detailed description of the invention

It, below will be to embodiment or description of the prior art in order to illustrate more clearly of the technical solution in the embodiment of the present disclosure Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some of the disclosure Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is a kind of structural schematic diagram for power circuit that a kind of embodiment of the disclosure provides；

Fig. 2 is a kind of electrical block diagram for power circuit that a kind of embodiment of the disclosure provides；

Fig. 3 is the part electricity of the prime power control chip in a kind of power circuit that a kind of embodiment of the disclosure provides Line structure schematic diagram；

Fig. 4 is the part electricity of the prime power control chip in a kind of power circuit that a kind of embodiment of the disclosure provides Line structure schematic diagram；

Fig. 5 is the part electricity of the prime power control chip in a kind of power circuit that a kind of embodiment of the disclosure provides Line structure schematic diagram；

Fig. 6 is the circuit knot of the secondary commutation control chip in a kind of power circuit that a kind of embodiment of the disclosure provides Structure schematic diagram.

Specific embodiment

It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the disclosure are more clearly understood The disclosure is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the disclosure, and It is not used in the restriction disclosure.

Further, in being described below, for illustration and not for limitation, such as particular system structure, skill are proposed The detail of art etc, to understand thoroughly the embodiment of the present disclosure.However, it will be clear to one skilled in the art that not having Have and the disclosure also may be implemented in the other embodiments of these details.In other situations, it omits to well-known system The detailed description of system, apparatus, circuit and method, in case unnecessary details interferes the description of the disclosure.

Below in conjunction with the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete Site preparation description, it is clear that described embodiment is disclosure a part of the embodiment, instead of all the embodiments.Based on this public affairs Embodiment in opening, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example belongs to the range of disclosure protection.

In order to illustrate the technical solution of the disclosure, the following is a description of specific embodiments.

The embodiment of the present disclosure provides a kind of power circuit 1, as shown in Figure 1, the power circuit 1 includes high input voltage module 10, prime power control module 11, transformer 12 and secondary commutation control module 13.

Wherein, high input voltage module 10 is connect with the primary coil of transformer 12, prime power control module 11 and transformation The primary coil of device 12 is connected with ancillary coil, and the secondary coil of transformer 12 is connect with secondary commutation control module 13, secondary Rectification control module 13 is connect with load (not shown).

Specifically, the High Level AC Voltage of access is converted to high voltage direct current, prime power control by high input voltage module 10 Module 11 samples the coupling output voltage at the ancillary coil end of transformer 12, controls 12, transformer according to sampled result It is electrically generated rechargeable energy according to high voltage direct current, secondary commutation control module 13 generates charging voltage according to rechargeable energy, and to charging Voltage charges after being rectified to load；Secondary commutation control module 13 is also used to examine the output voltage in charging process It surveys, and result will test by transformer 12 and feed back to prime power control module 11, prime power control module 11 is according to inspection Result is surveyed to be adjusted the input power of transformer 12.

In the present embodiment, the power circuit high input voltage module that the embodiment of the present disclosure provides is by the High Level AC Voltage of access High voltage direct current is converted to, prime power control module samples the coupling output voltage at the ancillary coil end of transformer, Transformer being controlled according to sampled result, rechargeable energy being electrically generated according to high voltage direct current, secondary commutation control module is according to rechargeable energy Charging voltage is generated, and is charged after being rectified to charging voltage to load；Secondary commutation control module is also used to charging Output voltage in journey is detected, and be will test result by transformer and fed back to prime power control module, prime power Control module is according to testing result adjusted the input power of transformer, so that power circuit can effectively fill load Circuit structure is simple while electric, reduce volume, component number and the electronic waste of generation of power circuit and at This is low, to solve existing power circuit there are volumes, big, component number is more, asking more than at high cost and electronic waste Topic.

Further, as a kind of embodiment of the disclosure, as shown in Fig. 2, the power circuit further includes filter module 14.

Wherein, filter module 14 is connect with the primary coil of high input voltage module 10 and transformer 12.Specifically, filtering Module 14 is used to carry out interference filtering to the high voltage direct current of the conversion output of high input voltage module 10.

In the embodiments of the present disclosure, by the way that filter module 14 is arranged in the circuit 1, so that the filter module 14 is defeated to high pressure Enter high voltage direct current made of module 10 is converted according to alternating current and carry out interference filtering, prevents the high voltage direct current of magazine to rear Terminal circuit has an impact, and ensure that the reliability of circuit.

Further, when it is implemented, as shown in Fig. 2, filter module 14 is real using inductance L1, capacitor C1 and capacitor C2 It is existing.

Specifically, the first end of inductance L1 and the first end of capacitor C1 connect altogether, and it is connect with high input voltage module 10, electricity The second end of sense L1 is connect with the primary coil of the first end of capacitor C2 and transformer 12, the second end and capacitor C2 of capacitor C1 Second end be connected to equipotential end altogether, and connect with high input voltage module 10.

Further, as a kind of embodiment of the disclosure, as shown in Fig. 2, high input voltage module 10 uses full-wave rectification Circuit and current-limiting resistance are realized.Wherein, full-wave rectifying circuit includes rectifier diode D1, D2, D3 and D4, and current-limiting resistance uses Resistance R1 is realized.

Specifically, the cathode of the anode and rectifier diode D4 of rectifier diode D1 connects altogether, and set with external communication power supply Standby anode connection, the cathode of rectifier diode D1 is connect with the cathode of rectifier diode D2, and first with inductance L1 simultaneously End connection, the anode of rectifier diode D2 connects altogether with the cathode of rectifier diode D3, and connect with the first end of current-limiting resistance R1, The second end of current-limiting resistance R1 is connect with the cathode of external communication power supply unit, the anode and rectifier diode of rectifier diode D3 The anode of D4 connects altogether, and connects altogether with the second end of capacitor C1 and the second end of capacitor C2 simultaneously.

Further, as a kind of embodiment of the disclosure, as shown in Fig. 2, prime power control module 11 includes primary Power control chip U1 and energy storage filter capacitor C3.

Wherein, primary coil, ancillary coil and the energy storage filter capacitor of prime power control chip U1 and transformer 12 C3 connection, energy storage filter capacitor C3 are connect with the ancillary coil of transformer 12.

Specifically, prime power, which controls chip U1, generates supply voltage according to the voltage of the outprimary of transformer 12, Energy storage filter capacitor C3 carries out energy storage according to supply voltage, to provide operating voltage to prime power control chip U1；

Prime power control chip U1 is also used to sample the coupling output voltage at the ancillary coil end of transformer 12, Transformer 12 is controlled according to sampled result, rechargeable energy is electrically generated according to high voltage direct current, and anti-according to secondary commutation control module 13 The testing result of feedback is adjusted the input power of transformer 12.

Further, as shown in Fig. 2, the 5th pin 5, the 6th pin 6, the 7th pin 7 of prime power control chip U1 And the 8th pin 8 connect altogether, and connect with the primary coil of transformer 12, prime power controls the first pin 1 of chip U1 It being connect with the ancillary coil of transformer 12, the second pin 2 of prime power control chip U1 is connect with energy storage filter capacitor C3, and The 4th pin 4 of prime power control chip U1 and energy storage filter capacitor C3 are connected to equipotential end altogether, energy storage filter capacitor C3 with The ancillary coil of transformer 12 connects.

Further, as a kind of embodiment of the disclosure, as shown in figure 3, prime power control chip U1 includes voltage Sampling module 111, error amplification module 112, constant pressure and flow control module 113, Logic control module 114, the first drive module 115, current sampling module 116, overcurrent protection module 117, power initiation module 118, power switching module 119 and switching tube 120。

Wherein, the ancillary coil and mistake of voltage sample module 111 and transformer 12 (being not shown in the figure, please refer to Fig. 2) Poor amplification module 112 connects, and error amplification module 112 is connect with constant pressure and flow control module 113, constant pressure and flow control module 113 connect with Logic control module 114, Logic control module 114 and overcurrent protection module 117, power switching module 119 and The connection of first drive module 115, the first drive module 115 are connect with switching tube 120, switching tube 120 and power switching module 119 And the primary coil connection of transformer 12, power switching module 119 and power initiation module 118 and energy storage filter capacitor C3 (being not shown in the figure, please refer to Fig. 2) connection, current sampling module 116 and power switching module 119 and overcurrent protection module 117 connections.

Specifically, after power circuit 1 powers on, switching tube 120 according to the voltage turn-on of the outprimary of transformer 12, When primary power control chip U1 work, Logic control module 114 and power initiation module 118 control power switching module 119 are in the first on state, so that power switching module 119 exports supply voltage；118 pairs of power initiation module confessions later Piezoelectric voltage is detected, and when supply voltage is lower than the first default supply voltage, is controlled power supply with Logic control module 114 and opened It closes module 119 and is continuously in the first on state, and when supply voltage is higher than the second default supply voltage, with logic control mould Block 114 controls power switching module 119 and is continuously in the second on state；

Further, when switching tube 120 is connected and power switching module 119 is in the second on state, current sample Module 116 samples the outprimary electric current of transformer 12, and current sample result is fed back to overcurrent protection module 117, overcurrent protection module 117 generates overcurrent protection signal, logic control mould according to current sample result and overcurrent reference voltage Block 114 generates overcurrent protection according to overcurrent protection signal and controls signal to the first drive module 115；

Voltage sample module 111 samples the coupling output voltage at the ancillary coil end of transformer 12, is adopted with obtaining Sampled voltage is compared by sample voltage, error amplification module 112 with reference voltage, to generate error amplification signal, constant pressure and constant Flow control module 113 generates control signal according to error amplification signal, and Logic control module 114 is protected according to control signal and overcurrent Shield control signal generates first switch and controls signal, and the first drive module 115 controls Signal-controlled switch pipe according to first switch 120 on-off frequency；

Voltage sample module 111 is also used to generate load response signal, 112 basis of error amplification module according to testing result Load response signal generates load response amplified signal, and constant pressure and flow control module 113 is generated according to load response amplified signal Load response control signal, Logic control module 114 according to load response control signal generate second switch control signal, first Drive module 115 controls the on-off frequency of Signal-controlled switch pipe 120 according to second switch.

Further, as a kind of embodiment is disclosed, it further includes output line complementary modulus block which, which controls chip U1, 121, input voltage compensation module 122, overvoltage protective module 123 and short circuit protection module 124.

Wherein, output line complementary modulus block 121 and error amplification module 112 and voltage sample module 111 connect, input voltage Compensating module 122 is connect with voltage sample module 111 and overcurrent protection module 117, overvoltage protective module 123 and voltage sample Module 111 and Logic control module 114 connect, short circuit protection module 124 equally with voltage sample module 111 and logic control Molding block 114 connects.

Specifically, bring main side current deviation when input voltage compensation module 122 is for compensating high-low pressure input；Output Line complementary modulus block 121 is used to compensate the pressure drop in output cord in different loads；Overvoltage protective module 123 is by by sampled voltage Compare generation overvoltage protection signal with internal over pressure protection benchmark to export to Logic control module 114, to realize that output overvoltage is protected Shield；Short circuit protection module 124 by by sampled voltage and internal short-circuit protect benchmark compare generate short-circuit protection signal export to Logic control module 114, to realize output short circuit protection.

It should be noted that in the embodiments of the present disclosure, output line complementary modulus block 121, input voltage compensation module 122, mistake The circuit structure and working principle of pressing protective module 123 and short circuit protection module 124 and the output in existing power circuit Line complementary modulus block, input voltage compensation module, overvoltage protective module and short circuit protection module are identical, specifically refer to existing skill Art, details are not described herein again.

Further, when it is implemented, as shown in figure 4, voltage sample module 111 includes: the first comparing unit 111a, Two comparing unit 111b, Logical processing unit 111c and sampling unit 111d.

Wherein, it the ancillary coil of the first comparing unit 111a and transformer 12 (being not shown in the figure, please refer to Fig. 2) and patrols Volume processing unit 111c connection, the ancillary coil of the second comparing unit 111b and transformer 12, Logical processing unit 111c and Sampling unit 111d connection, Logical processing unit 111c (do not show with sampling unit 111d and error amplification module 112 in figure Out, Fig. 3 is please referred to) it connects, sampling unit 111d is connect with the ancillary coil of transformer 12 and error amplification module 112.

Specifically, the first comparing unit 111a generates the first sampling comparison signal, logical process according to coupling output voltage Unit 111c generates the first sampling control signal according to the first sampling comparison signal, and sampling unit 111d is according to the first controlling of sampling Signal samples coupling output voltage, to export sampled voltage；Second comparing unit 111b according to coupling output voltage and Sampled voltage generates the second sampling comparison signal, and Logical processing unit 111c generates the second sampling according to the second sampling comparison signal Signal is controlled, sampling unit 111d stops sampling coupling output voltage according to the second sampling control signal；

In addition, the first comparing unit 111a is also used to generate the under-voltage comparison signal of load, logical process according to testing result Unit 111c generates load response signal according to under-voltage comparison signal, and load response signal is exported to error amplification module 112。

Further, when it is implemented, as shown in figure 4, the first comparing unit 111a is using comparator CMP1 realization, the ratio First input end compared with device CMP1 is connect with the ancillary coil of transformer 12, and the second input terminal of comparator CMP1 receives benchmark The output end of voltage, comparator CMP1 is connect with Logical processing unit 111c.

Likewise, as shown in figure 4, the second comparing unit 111b is realized using comparator CMP2, the of comparator CMP2 One input terminal is connect with the symbol ancillary coil of transformer 12, and the second input terminal and sampling unit 111d of comparator CMP2 connects It connects, the output end of comparator CMP2 is connect with Logical processing unit 111c.

Further, as a kind of embodiment of the disclosure, as shown in figure 4, sampling unit includes: first resistor R2, One switch element M1 and first capacitor C4.

Wherein, the first end of first resistor R2 and the ancillary coil of transformer 12 (being not shown in the figure, please refer to Fig. 2) connect Connect, the second end of first resistor R2 is connect with the input terminal of first switching element M1, the control terminal of first switching element M1 with patrol Collect processing unit 111c connection, the output end of first switching element M1 and the first end of first capacitor C4 and error amplification module 112 connections, the second end of first capacitor C4 are connect with equipotential end.

It should be noted that in the embodiments of the present disclosure, first switching element M1 is realized using N-type transistor, the N-type is brilliant The grid of body pipe is the control terminal of first switching element M1, and the drain electrode of the N-type transistor is the input terminal of first switching element M1, The source electrode of the N-type transistor is the output end of first switching element M1；Certainly it will be appreciated by persons skilled in the art that N-type Transistor is illustrating for first switching element M1, is not limited to that in the disclosure.

Further, as a kind of embodiment of the disclosure, as shown in figure 5, current sampling module 116 includes: second to open Close element M2 and third switch element M3.

Wherein, the control terminal of second switch element M2 and input terminal connect altogether, and with the control terminal of third switch element M3 with And power switching module 119 connects, the input terminal of the output end of second switch element M2 and third switch element M3 with etc. it is electric The connection of gesture end, the output end of third switch element M3 are connect with overcurrent protection module 117.

It should be noted that in the embodiments of the present disclosure, second switch element M2 and third switch element M3 are brilliant using N-type Body Guan Shixian, the grid of the N-type transistor are the control terminal of second switch element M2 and third switch element M3, the N-type crystal The drain electrode of pipe is the input terminal of second switch element M2 and third switch element M3, and the source electrode of the N-type transistor is second switch The output end of element M2 and third switch element M3；Certainly it will be appreciated by persons skilled in the art that N-type transistor is the Two switch element M2's and third switch element M3 illustrates, and is not limited to that in the disclosure.

Further, as a kind of embodiment of the disclosure, as shown in figure 5, power switching module 119 includes: the 4th to open Close element M4, the 5th switch element M5 and NAND gate NAND1.

Wherein, the input terminal of the 4th switch element M4 is connect with the input terminal of switching tube 120 and the 5th switch element M5, The control terminal of 4th switch element M4 is connect with the first input end of Logic control module 114, NAND gate NAND1, the 4th switch The output end of element M4 is connect with current sampling module 116, the second input terminal and power initiation module 118 of NAND gate NAND1 (being not shown in the figure, please refer to Fig. 3) connection, the output end of NAND gate NAND1 are connect with the control terminal of the 5th switch element M5, the The output end of five switch element M5 is connected with energy storage filter capacitor C3 (being not shown in the figure, please refer to Fig. 2).

It should be noted that in the embodiments of the present disclosure, the 4th switch element M4 and the 5th switch element M5 are brilliant using N-type Body Guan Shixian, the grid of the N-type transistor are the control terminals of the 4th switch element M4 and the 5th switch element M5, the N-type crystal The drain electrode of pipe is the input terminal of the 4th switch element M4 and the 5th switch element M5, and the source electrode of the N-type transistor is the 4th switch The output end of element M4 and the 5th switch element M5；Certainly it will be appreciated by persons skilled in the art that N-type transistor is the Four switch element M4's and the 5th switch element M5 illustrates, and is not limited to that in the disclosure.

Further, as a kind of embodiment of the disclosure, as shown in Fig. 2, secondary commutation control module 13 includes: secondary Rectification control chip U2 and output capacitance.

Wherein, the secondary coil of primary rectifier control chip U2 and transformer 12, output capacitance C5 and load connect.

Specifically, secondary commutation, which controls chip U2, generates charging voltage according to rechargeable energy, and charging voltage is carried out whole It charges after stream to load；Secondary commutation control chip U2 is also used to detect the output voltage in charging process, and passes through Transformer 12 will test result and feed back to prime power control module 11；Output capacitance C5 carries out energy storage according to output voltage, with To secondary commutation control chip U2 power supply.

When it is implemented, the first pin 1, second pin 2, the third pin 3 and the 4th of secondary commutation control chip U2 Pin 4 connects altogether, and connect with the secondary coil of transformer 12, and secondary commutation controls the 8th pin 8 and transformer of chip U2 The first end connection of 12 secondary coil, output capacitance C5, secondary commutation control the 5th pin 5 of chip U2, the 6th pin 6 with And the 7th pin 7 and output capacitance C5 be connected to ground altogether.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, secondary commutation control chip U2 includes: starting Power supply module 130, division module 131, overvoltage protective module 132, under-voltage protective module 133, rectification starting module 134, rectification Closedown module 135, control module 136, the second drive module 137 and switch module 138.

Wherein, start power supply module 130 and output capacitance C5 (being not shown in the figure, please refer to Fig. 2), division module 131, mistake Press protective module 132, under-voltage protective module 133, rectification starting module 134, rectification closedown module 135, control module 136 and The connection of second drive module 137, overvoltage protective module 132 are connect with output capacitance C5 and division module 131, under-voltage protection mould Block 133 is connect with division module 131 and control module 136, and rectification starting module 134 is connect with control module 136, and rectification is closed Die closing block 135 is connect with control module 136, and control module 136 is connect with the second drive module 137, the second drive module 137 with Switch module 138 connects, and switch module 138 and the secondary coil of transformer 12 (being not shown in the figure, please refer to Fig. 2) connect.

Specifically, starting power supply module 130 is supplied according to modules of the output voltage into secondary commutation control chip U2 Electricity；Division module 131 carries out partial pressure sampling to output voltage, to obtain branch pressure voltage；Overvoltage protective module 132 is in branch pressure voltage When greater than being higher than overvoltage protection voltage, discharge the output voltage of secondary commutation control chip U2；Under-voltage protective module 133 When branch pressure voltage is lower than low-voltage variation voltage, UVP signal, control module 136 and second are exported to control module 136 Drive module 137 is off working condition according to 133 control switch module 138 of under-voltage protective module, logical will test result It crosses transformer 12 and feeds back to prime power control module 11 (being not shown in the figure, please refer to Fig. 2).

Rectification starting module 134 detects the voltage of the out-secondary of transformer 12, when the secondary of transformer 12 When the voltage of coil-end is not less than synchronous rectification starting voltage threshold, output rectification open signal to control module 136 controls mould Block 136 and the second drive module 137 are on working condition according to rectification open signal control switch module 138；

Rectification closedown module 135 detects the voltage of the out-secondary of transformer 12, when the secondary of transformer 12 When the voltage of coil-end closes voltage threshold not less than synchronous rectification, output rectification shutdown signal to control module 136 controls mould Block 136 and the second drive module 137 are off working condition according to rectification shutdown signal control switch module 138.

It should be noted that in the embodiments of the present disclosure, Fig. 6 illustrates only starting power supply module 130 and secondary commutation control The connection relationship of part of module in coremaking piece U2, and start each mould in power supply module 130 and secondary commutation control chip U2 The specific connection relationship of block can refer to word segment explanation.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, division module 131 include divider resistance R3 with R4。

Wherein, the first end of divider resistance R3 and starting power supply module 130 and overvoltage protective module 132 practice grade, partial pressure The second end of resistance R3 is connect with the first end of divider resistance R4 and under-voltage protective module 133, the second end of divider resistance R4 Ground connection.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, overvoltage protective module 132 includes comparator CMP4, switch element M6 and resistance R5.

Wherein, the first input end of comparator CMP4 is connect with the second end of divider resistance R3, and the second of comparator CMP4 Input terminal receives overvoltage protection voltage, and the output end of comparator CMP4 is connect with the control terminal of switch element M6, switch element M6 Output end connect with equipotential end, the input terminal of switch element M6 is connect with the first end of resistance R5, the second end of resistance R5 It is connect with the first end of divider resistance R3 and starting power supply module 130.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, under-voltage protective module 133 includes comparator The first input end of CMP5, comparator CMP5 are connect with the first end of the second end of divider resistance R3 and divider resistance R4, The second input terminal of comparator CMP5 receives low-voltage variation voltage, and the output end and control module 136 of comparator CMP5 connects It connects.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, rectification starting module 134 includes comparator The first input end of CMP6, comparator CMP6 are connect with the input terminal of switch module 138, the second input of comparator CMP6 End receives synchronous rectification and starts voltage, and the output end of comparator CMP6 is connect with control module 136.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, rectification closedown module 135 includes comparator The first input end of CMP7, comparator CMP7 are connect with the input terminal of switch module 138, the second input of comparator CMP7 End receives synchronous rectification and closes voltage, and the output end of comparator CMP7 is connect with control module 136.

Further, as a kind of embodiment of the disclosure, as shown in fig. 6, switch module 138 includes switch element M7, The control terminal of switch element M7 is connect with the second drive module 137, and the input terminal of switch element M7 is switch module 138 Input terminal, the output end of switch element M7 are the output end of switch module 138.

It should be noted that in the embodiments of the present disclosure, switch element M6 and switch element M7 are real using N-type transistor Existing, the grid of the N-type transistor is the control terminal of switch element M6 and switch element M7, and the drain electrode of the N-type transistor is switch The input terminal of element M6 and switch element M7, the source electrode of the N-type transistor are the output end of switch element M6 and switch element M7； Certainly it will be appreciated by persons skilled in the art that N-type transistor is illustrating for switch element M6 and switch element M7, It is not limited to that in the disclosure.

The specific works of the power circuit 1 provided by taking Fig. 2 to circuit shown in fig. 6 as an example the embodiment of the present disclosure below are former Reason is illustrated, and details are as follows:

Firstly, as shown in Fig. 2, right by the high input voltage module 10 that rectifier diode D1 to D4 and current-limiting resistance R1 are formed After the High Level AC Voltage of access is rectified, the high voltage direct current electricity output that rectification is obtained is to by inductance L1, capacitor C1 and electricity Hold the filter circuit of C2 composition, which exports after being filtered to high voltage direct current.

After the filter circuit is by filtered high voltage direct current electricity output, the primary coil of the transformer 12 is according to the high pressure Direct current passes through energy storage filtered electrical by prime power control chip U1 starting, and after prime power control chip U1 starting Hold C3 and provides stable operating voltage to prime power control chip U1.After prime power control chip U1 work, just Grade power control chip U1 can directly sample the output voltage information of the end the ancillary coil NA coupling of transformer T1, and in adjustment The high voltage transistor working frequency and duty ratio set are to stabilize the output voltage and electric current, and without in existing power circuit Start-up resistor, feedback two poles and inspection leakage resistance.

When primary power control chip U1 adjustment built-in high voltage transistor working frequency and duty ratio, so that transformer After the energy assembled on 12 exports stable output voltage and electric current, secondary commutation controls chip U2 and passes through the first pin 1, second The secondary coil NS waveform of pin 2, third pin 3 and the 4th pin 4 detection transformer 12 realizes synchronous rectification, in turn The charging voltage needed is provided, to load to realize the charging of load；In addition, secondary commutation control microarray biochip U2 can be carried out Output detection, and prime power is fed back to by transformer 12 and controls chip U1, to prevent output overvoltage or under-voltage.

Further, referring to FIG. 3, power initiation module 118 and power supply are opened when primary power control chip U1 work It closes module 119 and controls chip U1 to prime power under the control and driving effect of drive module 115 and Logic control module 114 Power supply, so that prime power control chip U1 can work normally；In addition, power initiation module 118 can produce primary function Rate controls various voltage and current benchmark required for inside chip U1.

Further, current sampling module 116 is for sampling main side loop of power circuit (by the primary of the transformer 12 in Fig. 2 The circuit of switching tube 120, switch element M4 and M2 composition in coil and Fig. 5) electric current and be transferred to overcurrent protection module 117, in order to which overcurrent protection module 117 generates corresponding mistake according to the electric current and overcurrent protection reference current of main side loop of power circuit Stream protection control signal, and overcurrent protection control signal is sent to Logic control module 114；Voltage sample module 111 is logical Cross prime power control chip U1 the first pin 1 (FB pin) directly sampling external transformer 12 ancillary coil (feedback around Group) on can react the voltage signal of output voltage, i.e. coupling electricity of the voltage sample module 111 to the ancillary coil end of transformer 12 Pressure is sampled, and to obtain sampled voltage, and the sampled voltage is sent to error amplification module 112 and is compared, error is put Big module 112 generates error amplification signal after being compared sampled voltage with reference voltage, and by the error amplification signal It is transferred to constant pressure and flow control module 113；Constant pressure and flow control module 113 is according to defeated after error amplification signal generation control signal Out to Logic control module 114, in order to which Logic control module 114 is exported according to control signal and overcurrent protection module 117 Overcurrent protection control signal generate first switch and control signal, and the switch control signal is sent to the first drive module 115, so that the first drive module 115 controls the on-off frequency of Signal-controlled switch pipe 120 according to the first switch, and then make It obtains power circuit 1 and exports stable charging voltage.

Further, the secondary windings that voltage sample module 111 also can detecte transformer 12 is mapped to feedback winding Signal is controlled, and is transmitted to Logic control module 114, so that Logic control module 114 and drive module 115 are according to this The on-off of Signal-controlled switch pipe 120 is controlled, the function of controlling with achievement unit gradation grade.For example, when secondary commutation controls chip After the output voltage that U2 passes through transformer 12 to prime power control chip U1 fed power supplies circuit 1 is under-voltage, voltage sample module 111 generate load response signal according to the testing result that secondary commutation controls chip U2 feedback, and the load response signal is sent out It send to error amplification module 112；Error amplification module 112 generates load response amplified signal according to the load response signal, and Constant pressure and flow control module 113 is sent it to, constant pressure and flow control module 113 generates negative according to the load response amplified signal Responsive control signal is carried, and outputs this to Logic control module 114, Logic control module 114 is controlled according to load response to be believed Number generate second switch control signal, the first drive module 115 according to second switch control Signal-controlled switch pipe 120 on-off Frequency, to realize load response.

Further, as shown in figure 4, when voltage sample module 111 works, compared by the detection of secondary UVP signal Device CMP1 detection is generated by secondary commutation control chip U2 (being not shown in the figure, please refer to Fig. 2) and is transferred to just by transformer 12 The signal of grade power control chip U1 loads under-voltage comparison signal to generate, and the under-voltage comparison signal of the load is sent to and is patrolled Processing unit 111c is collected, Logical processing unit 111c generates load response signal QR after identifying to the under-voltage comparison signal, And then export the load response signal to error amplification module 112, so that error amplification module 112 is total with terminal circuit thereafter Same-action realizes the load response between primary and secondary.

In addition, comparator CMP1 can also generate the first sampling according to the coupling output voltage at the multiple ancillary coil end of transformer Comparison signal, and the first sampling comparison signal is exported to Logical processing unit 111c, Logical processing unit 111c is according to this First sampling comparison signal generates the first sampling control signal, is opened with control by what resistance R2, switch M1 and capacitor C4 were formed The switch M1 conducting in capacitor sampling circuit is closed, and then the voltage of FB foot is sampled, to obtain sampled voltage；It needs to illustrate , since feedback winding and secondary windings the ratio setting of transformer are smaller, there is no need to divider resistance, and chip can be with low Voltage sample function can be realized in pressure technique.

Further, comparator CMP2 is the comparator of an included imbalance, and input terminal is respectively the voltage signal at the end FB With the voltage signal after switch RC sampling, when specific works, comparator CMP2 is generated according to coupling output voltage and sampled voltage Second sampling comparison signal, and the second sampling comparison signal is exported to Logical processing unit 111c, Logical processing unit 111c generates the second sampling control signal according to the second sampling comparison signal, to control by resistance R2, switch M1 and capacitor Switch M1 in the switching capacity sample circuit of C4 composition is disconnected, and then stops sampling coupling output voltage.

It further, is prime power control chip U1 as shown in figure 5, C foot connects the primary coil of external transformer The 5th pin 5, the 6th pin 6, the 7th pin 7 and the 8th pin 8, switching tube 120 be high-voltage power transistor, resistance Rcb is the high-tension resistive between the collector and base stage of switching tube 120, can be what device technology integrated, can also be added in Chip exterior is not particularly limited herein.When primary power control chip U1 work, prime power controls the specific of chip U1 Power supply process are as follows: high-voltage end exports ideal base drive current to switching tube 120 by resistance Rcb, and switching tube 12 is opened at this time, and 114 control switch element M4 of Logic control module close and Logic control module 114 and power initiation module 118 and with NOT gate NAND1 co- controlling switch element M5 is opened, and the emitter current of switching tube 120 can be flowed to just by switching tube M5 at this time The VDD foot of grade power control chip U1, i.e. second pin 2, until prime power control chip U1 is opened.When primary power control When chip U1 works, if prime power control chip U1 detects that vdd voltage is relatively low, Logic control module 114 will switched Pipe 120 be connected certain a period of time in control switch M4 it is continuously off, and with power initiation module 118 and NAND gate NAND1 co- controlling switch M5 is persistently opened, so that electric current passes through the power supply capacitor C3 of VDD foot to ground, forms current path, And be VDD capacitor charging, and then to prime power control chip U1 power supply, and if when prime power control chip U1 is detected When vdd voltage is excessively high, then Logic control module 114 by within certain a period of time that switching tube 120 is connected control switch M4 be connected, And it is continuously off with power initiation module 118 and NAND gate NAND1 co- controlling switch M5, to disconnect VDD foot and power supply Current path between capacitor C3；It should be noted that in the embodiments of the present disclosure, since above-mentioned power supply process is benefit when utilizing It is powered in periodic main side inductive current, and when output no-load, power circuit working frequency is extremely low, and power-up period prolongs It is long, it is under-voltage so to would potentially result in VDD, therefore prime power control chip U1 will be connected in switching tube 120, and switch element In the time that M4 is disconnected, be connected by control switch element M5 to realize the power supply to VDD, therefore be not necessarily to external start-up resistor In the case where feedback power supply circuit, starting also may be implemented in prime power control chip U1 can function of supplying power.

Further, as shown in figure 5, the specific working mode of current sampling module 116 are as follows: switch element M2 and switch member Part M3 forms current mirror, and then forms main side current sample with switching tube 120, i.e., as switching tube 120 and switch element M4 and When switch element M2 is connected, flow through the electric current of transformer 12 with flow through the identical of switch element M4 and switch element M2, and by In switch element M3 and switch element M3 be current mirror, therefore can be scaled by main side electric current by mirror image, to obtain phase The current sample answered is as a result, overcurrent protection comparator CMP3 can carry out the current sample result and internal overcurrent reference voltage Compare and generate overcurrent protection signal, to realize overcurrent protection.

Further, as shown in fig. 6, the concrete operating principle of secondary commutation control chip U2 are as follows: starting power supply module 130 According to modules power supply of the output voltage into secondary commutation control chip U2, i.e. offer secondary commutation controls chip U2 chip Voltage needed for working；Output voltage is divided by the branch pressure voltage that resistance R3 and R4 are formed, to obtain branch pressure voltage；Compare Device CMP4 is VCC overvoltage protection comparator, and when the end VCC voltage is more than overvoltage protection voltage threshold, comparator CMP1 is overturn simultaneously Protection signal is generated, with control switch element M6 conducting, to discharge VCC；Comparator CMP5 is VCC under-voltage protection ratio Compared with device, when loading switching at runtime or output voltage undershoot, comparator CMP5 will be generated according to the output voltage variation detected Signal is protected, and by the protection signal transmission to control module 136, to realize response protection, such as when branch pressure voltage is lower than low When pressure protection voltage, comparator CMP5 exports UVP signal, control module 136 and the second driving mould to control module 136 Block 137 is off working condition according to under-voltage protective module control switch element M7, passes through transformer 12 will test result Feed back to prime power control module 11 (being not shown in the figure, please refer to Fig. 2).

Further, comparator CMP6 is that comparator is opened in synchronous rectification, when voltage, that is, secondary commutation of VD foot controls core The first pin 1 of piece U2, the voltage at 4 end of second pin 2, third pin 3 and the 4th pin reach synchronous rectification starting voltage When threshold value, comparator CMP6, which overturns and generates rectification open signal, is transferred to control module 136, and control module 136 and second drive Dynamic model block 137 is connected according to the synchronous rectification open signal control switch element M7, and comparator CMP7 is that ratio is closed in synchronous rectification Compared with device, when the voltage of VD foot, which reaches synchronous rectification, closes voltage threshold, comparator CMP7 overturns and generates rectification shutdown signal Control module 136, control module 136 and the second drive module 137 are transferred to according to the synchronous rectification shutdown signal control switch Element M7 is disconnected, and the secondary synchronization rectification of power circuit 1 is realized with this.

It should be noted that in the embodiments of the present disclosure, when control module 136 in the second drive module 137 according to under-voltage Protective module control switch element M7 is off working condition, feeds back to prime power will test result by transformer 12 When control module 11, control module 136 can generate a pulse control signal in the security interval of synchronous rectification shut-in time, And a bit of time is connected according to pulse control signal control switch element M7 with the second drive module 137, thus will output Under-voltage signal is transferred to prime power by transformer 12 and controls chip U1, and prime power control chip U1 detects that the output is owed It will be responded after pressure signal, to realize the secondary load response function of detecting and control.

In addition, in the embodiments of the present disclosure, it is another on the one hand since secondary commutation control chip U2 has certain power consumption Aspect secondary commutation control chip U2 when power circuit 1 is unloaded the work of controllable power circuit in extremely low working frequency, from And make unloaded output power minimum, therefore secondary commutation control chip U2 eliminates dummy resistance, simplify power supply electricity The circuit structure on road；In addition, since secondary commutation controls chip U2 load response function, when power circuit 1 is in extremely low work When working under working frequency, if access load suddenly, secondary commutation control chip U2 also can detecte and feed back output electricity at this time The situation of change of pressure, and the situation of change is transferred to prime power control chip U1, so that prime power controls chip U1 Load variation is responded, realizes outstanding load response performance.

In the embodiments of the present disclosure, the disclosure provide power circuit 1 by using prime power control chip U1 and time Grade rectification control chip U2, so that for the power circuit 1 is compared to existing power circuit, without chip start-up resistor, instead Supply network, feedback divider resistance, inspection leakage resistance and dummy resistance are presented, a large amount of peripheral cells are reduced, high degree The circuit structure of entire power circuit is simplified, so that the circuit structure of the power circuit is simpler, convenient for design while side Case integrated level is high, is conducive to charger and minimizes, and scheme cost substantially reduces, and integrated level is high, and then can bring higher Reliability and safety.

Further, the disclosure additionally provides a kind of power-supply device, which includes power circuit 1.It needs to illustrate , by the power circuit of power-supply device provided by the embodiment of the present disclosure and Fig. 1 to Fig. 6 power circuit 1 it is identical, because This, the concrete operating principle of the power circuit 1 in power-supply device provided by the embodiment of the present disclosure can refer to previously with regard to Fig. 1 To the detailed description of Fig. 6, details are not described herein again.

In the embodiments of the present disclosure, the power circuit high input voltage module that the disclosure provides turns the High Level AC Voltage of access It is changed to high voltage direct current, prime power control module samples the coupling output voltage at the ancillary coil end of transformer, root Rechargeable energy is electrically generated according to high voltage direct current according to sampled result control transformer, secondary commutation control module is raw according to rechargeable energy It charges at charging voltage, and after being rectified to charging voltage to load；Secondary commutation control module is also used to charging process In output voltage detected, and result will test by transformer and feed back to prime power control module, prime power control Molding block is according to testing result adjusted the input power of transformer, so that power circuit can be to load effectively charging While circuit structure it is simple, thus reduce the volume of power circuit, component number and the electronic waste of generation and It is at low cost.

Above embodiments are only to illustrate the technical solution of the disclosure, rather than its limitations；Although with reference to the foregoing embodiments The disclosure is described in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or Replacement, the spirit and scope of each embodiment technical solution of the disclosure that it does not separate the essence of the corresponding technical solution should all include Within the protection scope of the disclosure.

Claims (10)

1. a kind of power circuit, which is characterized in that the power circuit includes:

High input voltage module, prime power control module, transformer and secondary commutation control module；

The connection of the primary coil of the high input voltage module and transformer, the prime power control module and the transformer Primary coil is connected with ancillary coil, and the secondary coil of the transformer is connect with the secondary commutation control module, and described time Grade rectification control module and load connect；

The High Level AC Voltage of access is converted to high voltage direct current, the prime power control module pair by the high input voltage module The coupling output voltage at the ancillary coil end of the transformer is sampled, and controls the transformer according to institute according to sampled result It states high voltage direct current and is electrically generated rechargeable energy, the secondary commutation control module generates charging voltage according to the rechargeable energy, and It charges after being rectified to the charging voltage to the load；The secondary commutation control module is also used to in charging process Output voltage detected, and result will test by the transformer and feed back to the prime power control module, it is described Prime power control module is adjusted according to input power of the testing result to the transformer.

2. power circuit as described in claim 1, which is characterized in that the prime power control module includes:

Prime power controls chip and energy storage filter capacitor；

Primary coil, ancillary coil and the energy storage filter capacitor of the prime power control chip and the transformer connect It connects, the energy storage filter capacitor is connect with the ancillary coil of the transformer；

The prime power control chip generates supply voltage, the energy storage according to the voltage of the outprimary of the transformer Filter capacitor carries out energy storage according to the supply voltage, to provide operating voltage to prime power control chip；

The prime power control chip is also used to sample the coupling output voltage at the ancillary coil end of the transformer, The transformer is controlled according to sampled result, rechargeable energy is electrically generated according to the high voltage direct current, and according to the secondary commutation control The testing result of module feedback processed is adjusted the input power of the transformer.

3. power circuit as claimed in claim 2, which is characterized in that the prime power controls chip and includes:

Voltage sample module, error amplification module, constant pressure and flow control module, Logic control module, the first drive module, electric current Sampling module, overcurrent protection module, power initiation module, power switching module and switching tube；

The voltage sample module is connect with the ancillary coil of the transformer and the error amplification module, and the error is put Big module is connect with the constant pressure and flow control module, and the constant pressure and flow control module is connect with the Logic control module, The Logic control module is connect with the overcurrent protection module, the power switching module and first drive module, First drive module is connect with the switching tube, the switching tube and the power switching module and the transformer Primary coil connection, the power switching module is connect with the power initiation module and the energy storage filter capacitor, described Current sampling module is connect with the power switching module and the overcurrent protection module；

After the power circuit powers on, the switching tube works as institute according to the voltage turn-on of the outprimary of the transformer When stating prime power control chip operation, the Logic control module and the power initiation module control the power switch mould Block is in the first on state, so that the power switching module exports the supply voltage；The power initiation module pair The supply voltage is detected, and when the supply voltage is lower than the first default supply voltage, with the logic control mould Block controls the power switching module and is continuously in the first on state, and is higher than the second default power supply electricity in the supply voltage When pressure, the power switching module is controlled with the Logic control module and is continuously in the second on state；

When the switching tube is connected and the power switching module is in the second on state, the current sampling module is to institute The outprimary electric current for stating transformer is sampled, and current sample result is fed back to the overcurrent protection module, described Overcurrent protection module generates overcurrent protection signal, the logic control mould according to the current sample result and overcurrent reference voltage Root tuber generates overcurrent protection according to the overcurrent protection signal and controls signal to first drive module；

The voltage sample module samples the coupling output voltage at the ancillary coil end of the transformer, to obtain sampling Voltage, the sampled voltage is compared by the error amplification module with reference voltage, described to generate error amplification signal Constant pressure and flow control module generates control signal according to the error amplification signal, and the Logic control module is according to the control Signal and overcurrent protection control signal generate first switch and control signal, and first drive module is opened according to described first Close the on-off frequency that control signal controls the switching tube；

The voltage sample module is also used to generate load response signal, the error amplification module root according to the testing result Load response amplified signal is generated according to the load response signal, the constant pressure and flow control module is put according to the load response Big signal generates load response and controls signal, and the Logic control module controls signal generation second according to the load response and opens Control signal is closed, first drive module controls the on-off frequency that signal controls the switching tube according to the second switch.

4. power circuit as claimed in claim 3, which is characterized in that the voltage sample module includes:

First comparing unit, the second comparing unit, Logical processing unit and sampling unit；

First comparing unit is connect with the ancillary coil of the transformer and the Logical processing unit, second ratio It is connect compared with unit with the ancillary coil of the transformer, the Logical processing unit and the sampling unit, at the logic Reason unit is connect with the sampling unit and the error amplification module, the auxiliary line of the sampling unit and the transformer Circle and error amplification module connection；

First comparing unit generates the first sampling comparison signal, the Logical processing unit according to the coupling output voltage The first sampling control signal is generated according to the first sampling comparison signal, the sampling unit is according to first controlling of sampling Signal samples the coupling output voltage, to export the sampled voltage；Second comparing unit is according to the coupling It closes output voltage and the sampled voltage generates the second sampling comparison signal, the Logical processing unit is according to second sampling Comparison signal generates the second sampling control signal, and the sampling unit stops according to second sampling control signal to the coupling Output voltage is closed to be sampled；

First comparing unit, which is also used to be generated according to the testing result, loads under-voltage comparison signal, the logical process list Member generates the load response signal according to the under-voltage comparison signal, and the load response signal is exported to the error Amplification module.

5. power circuit as claimed in claim 4, which is characterized in that the sampling unit includes:

First resistor, first switching element and first capacitor；

The first end of the first resistor is connect with the ancillary coil of the transformer, the second end of the first resistor with it is described The input terminal of first switching element connects, and the control terminal of the first switching element is connect with the Logical processing unit, described The output end of first switching element is connect with the first end of the first capacitor and the error amplification module, first electricity The second end of appearance is connect with equipotential end.

6. power circuit as claimed in claim 3, which is characterized in that the current sampling module includes:

Second switch element and third switch element；

The control terminal and input terminal of the second switch element connect altogether, and with the control terminal of the third switch element and described Power switching module connection, the input terminal of the output end of the second switch element and the third switch element is and equipotential End connection, the output end of the third switch element are connect with the overcurrent protection module.

7. power circuit as claimed in claim 3, which is characterized in that the power switching module includes:

4th switch element, the 5th switch element and NAND gate；

The input terminal of 4th switch element is connect with the input terminal of the switching tube and the 5th switch element, described The control terminal of 4th switch element is connect with the first input end of the Logic control module, the NAND gate, and the described 4th opens The output end for closing element is connect with the current sampling module, the second input terminal of the NAND gate and the power initiation module Connection, the output end of the NAND gate are connect with the control terminal of the 5th switch element, the output of the 5th switch element End is connect with the energy storage filter capacitor.

8. power circuit as described in claim 1, which is characterized in that the secondary commutation control module includes:

Secondary commutation controls chip and output capacitance；

Secondary coil, the output capacitance and the load of the primary rectifier control chip and the transformer connect；

The secondary commutation control chip generates charging voltage according to the rechargeable energy, and rectifies to the charging voltage The backward load charging；The secondary commutation control chip is also used to detect the output voltage in charging process, and It will test result by the transformer and feed back to the prime power control module；The output capacitance is according to the output electricity Pressure carries out energy storage, to power to secondary commutation control chip.

9. power circuit as claimed in claim 8, which is characterized in that the secondary commutation controls chip and includes:

Start power supply module, division module, overvoltage protective module, under-voltage protective module, rectification starting module, rectification closing mould Block, control module, the second drive module and switch module；

The starting power supply module and the output capacitance, the division module, the overvoltage protective module, the under-voltage protection Module, the rectification starting module, the rectification closedown module, the control module and second drive module connection, The overvoltage protective module is connect with the output capacitance and the division module, the under-voltage protective module and the partial pressure Module and control module connection, the rectification starting module are connect with the control module, the rectification closedown module Connect with the control module, the control module is connect with second drive module, second drive module with it is described Switch module connection, the switch module are connect with the secondary coil of the transformer；

The starting power supply module is powered according to modules of the output voltage into secondary commutation control chip；Institute It states division module and partial pressure sampling is carried out to the output voltage, to obtain branch pressure voltage；The overvoltage protective module is at described point When piezoelectricity pressure is greater than higher than overvoltage protection voltage, discharge the output voltage of secondary commutation control chip；It is described to owe Press protective module when the branch pressure voltage is lower than low-voltage variation voltage, Xiang Suoshu control module exports UVP signal, institute It states control module and second drive module and work is off according to the under-voltage protective module control switch module State gives the testing result to the prime power control module by the transformer feedback；

The rectification starting module detects the voltage of the out-secondary of the transformer, when the secondary of the transformer When the voltage of coil-end is not less than synchronous rectification starting voltage threshold, output rectification open signal is described to the control module Control module and second drive module control the switch module according to the rectification open signal and are on work shape State；

The rectification closedown module detects the voltage of the out-secondary of the transformer, when the secondary of the transformer When the voltage of coil-end closes voltage threshold not less than synchronous rectification, output rectification shutdown signal is described to the control module Control module and second drive module control the switch module according to the rectification shutdown signal and are off work shape State.

10. a kind of power-supply device, which is characterized in that the power-supply device includes power supply as described in any one of claim 1 to 9 Circuit.