TWI382640B - Global switched power supply and its serial - to - parallel DC - to - DC power conversion circuit - Google Patents

Description

Global switching power supply and its serial-parallel DC-to-DC power conversion circuit

The invention relates to a DC-DC power conversion circuit, in particular to a serial-parallel DC-DC power conversion circuit.

Switching power supplies are available in different types depending on the AC power source used. Currently, they can be divided into 90V~130V low-voltage AC power supplies and 185V~265V high-voltage AC power supplies. At present, Taiwan uses 220V or 110V AC power supply. Therefore, the switching power supply product includes a switching power supply for single AC power supply, or a global switching power supply; and a global switching power supply. The device is more popular.

Referring to FIG. 8 , it is a circuit diagram of a global AC power supply, comprising a full-wave rectifier (50), a boost power factor correction circuit (51), and a DC power conversion circuit ( 52). The full-wave rectifier (50) rectifies (AC IN) the AC power into a DC sine wave, and then passes the first active power factor correction controller (511) of the power factor correction circuit (51) in the boost circuit architecture. The switch (S1) adjusts its voltage and current phase to output a DC power source of preferred power factor and boosts the DC sine wave voltage to approximately 400 volts of high voltage DC power supply (V _BULK ). Then, a high-voltage DC power supply (V _BULK ) is input to the DC power conversion circuit (52), and the pulse width modulation controller (521) of the DC power conversion circuit (52) is based on the DC voltage output terminal ( The voltage change of V _O ) is modulated by the second active switch (S2) to regulate the current of the primary side of the transformer (522) to maintain a stable DC voltage output (V _O ).

According to the circuit architecture of the above switching power supply, the full-wave rectifier (50) rectifies the 220V or 110V AC source into a DC sine wave of different voltage, but once input to the boosting power factor correction circuit ( 51), will be boosted to 400V high-voltage DC power supply (V _BULK ), so that the DC power conversion circuit of the latter stage can step down and regulate the 400V high-voltage DC power supply to 12V or 5V and output to the load; The power factor correction circuit will be stepped down to 80V, which can be used to convert the 80V medium and high voltage DC power supply to 12V or 5V and output to the load.

In terms of overall power conversion efficiency, when a 220V AC power source is input to the above-mentioned switching power supply, the power factor correction controller (511) of the boost power factor correction circuit (51) outputs a pulse width modulation signal to The first active switch (S1) causes the storage capacitor (C1) to output a 400V DC power supply to the DC power conversion circuit (52) of the subsequent stage. At this time, the overall power conversion efficiency is calculated to be about 96%; however, when the 110V AC power supply is used When inputting, the power factor correction controller (511) of the power factor correction circuit (51) will increase the pulse width of the pulse width modulation signal, so that the storage capacitor (C1) also outputs a 400V DC power supply, however, due to the first The on-time of the active switch (S1) becomes longer, and the on-resistance of the first active switch (S1) consumes more power, and the overall conversion efficiency is reduced to 94%.

In the power factor correction controller of the step-down power factor correction circuit, when a 220V AC power source is input to the above-mentioned switching power supply, the step-down power factor correction circuit must control the first active switch (S1) to adjust the voltage. Down to 80V, and reduce the overall conversion efficiency to 94%, it can be seen that although the global switching power supply can use 220V or 110V AC power, but the boost type power factor correction circuit is plugged into 110V When the AC power supply is used, or when the step-down power factor correction circuit is used to plug into the 220V AC power supply, the overall circuit conversion efficiency is not good, so a better circuit design must be sought.

In view of the above drawbacks of the existing full range switching power supply, the main object of the present invention is to provide a new universal switching power supply and a serial-parallel DC-to-DC power conversion circuit thereof. The series-parallel DC-to-DC power conversion circuit can change the transformer turns ratio according to the power factor correction circuit of the previous stage to output different voltage DC power, and improve the power conversion efficiency of the global switching power supply using the present invention.

The main technical means used to achieve the above purpose is that the series-parallel DC-to-DC power conversion circuit includes: a rectifier that can be commonly connected to an AC power source to convert the AC power into a DC sine wave power source; a factor correction circuit, the input end of which is connected to the output end of the rectifier, and adjusts the voltage of the output of the first DC power supply according to the current input AC power source size; and a series of parallel DC-to-DC power conversion circuit, the input end thereof Connected to the output end of the power factor correction circuit to receive the first DC power supply and convert it into a second DC power supply and output; wherein the serial-parallel DC power conversion circuit is based on the first DC power supply and the second The DC power supply voltage ratio adjusts the transformer turns ratio, so that the transformer turns ratio is proportional to the first DC power supply and the second DC power supply voltage ratio.

The main technical means for achieving the above purpose is that the series-parallel DC-to-DC power conversion circuit includes: a transformer, which includes a primary side coil and a secondary side coil, and the secondary side coil system A low-voltage DC power supply is output; a full-bridge switching circuit is connected to the output end of the power factor correction circuit, and includes two first and second switch groups connected in parallel, and each active switch group includes two connected ones in series The upper arm active switch and the lower arm active switch, the first and second switch groups of the series node are connected to the transformer primary side coil two ends; a switch is connected between the transformer primary side coil intermediate tap and the ground end; And a pulse width modulation controller, which is connected to the control arms of the two upper arm active switches and the two lower arm active switches and the switchers of the first and second switch groups; the above-mentioned serial-parallel DC-DC power conversion circuit of the present invention Connected to the output of the power stage correction circuit of the preceding stage, and the PWM controller can be based on the magnitude of the AC power supply voltage or the power factor correction circuit of the preceding stage Output voltage, control the active switch of the full-bridge switch circuit and the open/close state of the switch, adjust the matching turns ratio of the output voltage, and then select the appropriate active switch for the DC power conversion process; that is, to boost The power factor correction circuit is used to control the turns ratio of the primary side coil and the secondary side coil of the transformer and the high voltage DC power supply when using a 220V high voltage section AC power supply voltage and outputting about 400V high voltage DC power supply to the full bridge switching circuit. The low-voltage DC power supply voltage ratio is proportional; on the contrary, when using the 110V low-voltage section AC power supply voltage and outputting about 200V high-voltage DC power supply to the full-bridge switching circuit, the transformer turns ratio must be reduced, so that the transformer turns ratio and high-voltage DC The power supply and the low-voltage DC power supply voltage ratio are proportional; thus, the DC-DC power conversion circuit of the present invention can output a stable and fixed low-voltage DC power supply voltage regardless of the AC power supply used; The conversion circuit can be compatible with the pre-stage power factor correction circuit that outputs different voltage DC power supplies. , So that global type switching power supply having better power conversion efficiency.

Referring first to the first and third figures, there is shown a global switching power supply of the present invention, comprising: a rectifier (30) that can be commonly connected to an AC power source to convert AC power. It is a DC sine wave power supply; a signal detection unit (40) detects the current input AC power supply voltage and outputs a detection signal; a power factor correction circuit (20) whose input end is connected to the rectifier ( 30) The output end of the output end and the signal detecting unit (40) adjusts the voltage of the output first DC power supply (V _BULK ) according to the current input AC power supply voltage; in this embodiment, the boosting is adopted. a power factor correction circuit; and a series of parallel DC to DC power conversion circuit (10), the input end of which is connected to the output of the power factor correction circuit (20) and the signal detection unit (40) to receive the a DC power supply (V _BULK ), which is converted into a second DC power supply (V _out ) and outputted; wherein the serial-parallel DC power conversion circuit (10) is based on a first DC power supply (V _BULK ) and Two DC power supply (V _out ) voltage ratio adjusts its voltage transformation (11) The turns ratio of the primary side coil (111) and the secondary side coil (112), the transformer (11) turns ratio and the first DC power supply (V _BULK ) and the second DC power supply (V _out ) The voltage ratio is proportional.

Please refer to the second figure, which is a detailed circuit diagram of a preferred embodiment of the signal detecting unit (40), which includes: a low pass filter (R1, R2, C2) connected to the An output of the rectifier (10) to further filter the DC sine wave into a DC current level; a comparator (41) having an input connected to the low pass filter (R1, R2, C2) and the other input Then, a first reference voltage (V _ref1 ) is connected, and after the comparison, the high and low potential DC signals are output; an electronic switch (Q) whose control end is connected to the output end of the comparator (41), and the electronic switch (Q) is a series-connected resistor (R13); and a voltage divider consisting of two resistors (R11, R12) connected in series, wherein the lower resistor (R12) is connected to the serial electronic switch (Q) and resistor ( R13) is connected in parallel, and the series node of the voltage divider is connected to the corresponding power factor correction circuit (20).

Please refer to the third figure as a detailed circuit diagram of the switching power supply using the step-up power factor correction circuit (20), which includes: a storage inductor (L), one end of which is connected to the An output terminal of the full-wave rectifier (20); a storage capacitor (C _bulk ) is connected between the other end of the energy storage inductor (L) and the ground, and outputs a first DC power supply (V _BULK ) to the string a parallel DC-to-DC power conversion circuit (10); an electronic switch (Q5) connected between the energy storage inductor (L) and the storage capacitor (C _bulk ) node and the ground;

a controller (M1) whose output is connected to the control end of the electronic switch (Q5) and the output end of the corresponding signal detecting unit (40), and adjusts the electronic switch according to the signal detecting unit (40) (Q5) The control terminal outputs a pulse width modulation signal, and the controller (M1) includes at least one error amplifier (M11), a second reference voltage terminal (V _ref2 ) and a switch driving unit (M12), wherein the error amplifier ( M11) An input terminal is connected to the reference voltage terminal (V _ref2 ), and the other input terminal is connected to a voltage divider (R11, R12) series connection of the corresponding signal detecting unit (40).

In the following, the circuit operation of the boosting power factor correction circuit (20) is further explained. When the 220V high-voltage section AC power supply is currently connected, the comparator (41) of the signal detecting unit (40) outputs a high potential to drive. The electronic switch (Q) is turned on, so that the resistor (R13) is connected in parallel with the lower resistor (R12) of the voltage divider, so the error amplifier (M11) in the controller (M1) is connected to the voltage divider (R11, R12). The voltage level will drop, and then the pulse width modulation signal outputted by the switch driving unit (M12) to the electronic switch (Q) will be changed, so that each storage capacitor (C _bulk ) outputs about 400 V of the first DC power supply ( V _BULK ).

When the 110V low-voltage section AC power supply is currently connected, the comparator (41) of the signal detecting unit (40) outputs a low potential, so that the electronic switch (Q) is no longer turned on, so the resistor (R13) is no longer The lower resistors (R12) of the voltage dividers (R11, R12) are connected in parallel; at this time, the voltage level of the error amplifier (M11) in the controller (M1) connected to the voltage divider (R11, R12) rises. thereby changing the switch driving means (M12) to the electronic switch (Q), the output PWM signal, and outputs a first DC power source of about 200V (V _BULK) on each of the storage capacitors (C _bulk).

Therefore, the power factor correction circuit (20) of the switching power supply of the present invention does output a first DC power supply (V _BULK ) of different voltage magnitudes to the serial-parallel DC-DC of the subsequent stage depending on the AC power supply voltage used. Power conversion circuit (10).

The serial-parallel DC-DC power conversion circuit (10) of the present invention further includes: a transformer (11) including a primary side coil (111) and a secondary side coil (112), the primary side side coil (111) comprises a second coil (111a) (111b); wherein the secondary coil (112) lines through a rectifying and filtering circuit (D1 ~ D4, C _out) to output the second DC power source (V _out); a The full bridge switch circuit (12) includes two first and second switch groups (121) (122), and each of the first and second active switch groups (121) (122) includes two phases connected in series One upper arm active switch (Q1) (Q3) and lower arm active switch (Q2) (Q4), and the first and second switch groups (121) (122) series node system and transformer (11) primary side coil (111) two-terminal connection; wherein each of the active switches (Q1~Q4) can be a MOSFET or an IGBT, in this embodiment, a MOSFET is used, and the gate of each MOSFET is its control end; a switch (SW), It is connected between the middle tap of the primary side coil (111) of the transformer (11) and the ground end; in the embodiment, the switch (SW) is a relay; and a pulse width modulation controller (13), Connected to the control terminals of the two upper arm active switches (Q1) (Q3) and the two lower arm active switches (Q2) (Q4) and the switch (SW) of the first and second switch groups (121) (122), An input end of the pulse width modulation controller (13) is connected to a series connection of the voltage divider (R11, R12) in the signal detecting unit (40); wherein the pulse width modulation controller (13) is based on The detection signal outputted by the signal detecting unit (40) determines the output voltage of the previous stage power factor correction circuit (20), and performs a parameter adjustment procedure, that is, by controlling the active switch of the full bridge switching circuit (12) (Q1~Q4) and the opening and closing state of the switch (SW), the transformer (11) of the first DC power supply (V _out ) voltage is adjusted to match the primary side coil (111) and the secondary side coil (112). The ratio is compared with the DC conversion procedure, that is, the appropriate active switch (Q1~Q4) is selected to output the pulse width modulation signal, and the input first DC power supply (V _BULK ) is _passed through the transformer with appropriate turns ratio (11). A second DC power source (V _out ) that is stable and fixed in voltage is converted.

In the following, the pulse width modulation controller (13) further adjusts the transformer (11) primary side coil (111) of the DC to DC power conversion circuit (13) according to the output voltage of the front stage power factor correction circuit (20). And the equivalent circuit diagram of the turns ratio of the secondary side coil (112).

First, please refer to the fourth A picture, so that the front stage power factor correction circuit (20) is a boost circuit, and when the high voltage AC power supply is used, a first high voltage DC power supply is outputted to the output capacitor (C _bulk ). (V _BULK). In the case of using a 220V AC power supply, the boost power factor correction circuit (20) outputs a first high voltage DC power supply (V _BULK ) of about 400V, so the pulse width modulation controller (13) of the present invention must control the transformer. (11) The primary side coil (111) maintains a maximum number of turns (Na), that is, the upper arm active switch (Q3) that controls the second switch group (122) is turned off, and the lower arm active switch (Q4) is turned on, and At the same time, the switch (SW) is controlled to be in a normally open circuit state, so that the primary side coil (111) of the transformer (11) constitutes a single coil, and the two ends thereof are respectively connected to the series node and the ground end of the first switch group (121). First, the primary side coil (111) and the secondary side coil (112) turns ratio (Na: Nb) match the front stage boost type power factor correction circuit (20) to output a first high voltage DC power supply of about 400V (V) _BULK ). At this time, the pulse width modulation controller (13) further outputs two sets of pulse width modulation signals (PWM1, PWM2) having a pulse width of 50% to the upper and lower arm active switch control ends of the first switch group (121) ( G1) (G2), to alternately open and close the upper and lower arm active switch (Q1) (Q2) of the first switch group (121), because the primary side coil (111) is further connected in series with an inductor capacitor (Cr1, Lr1) ( Cr2, Lr2), so when the upper arm or the lower arm active switch (Q1) (Q2) of the first switch group (121) is turned on, the primary side coil (111) can be connected to the two sets of inductors and capacitors (Cr1, Lr1) in series. (Cr2, Lr2) constitutes a resonance tank circuit (Resonance Tank), and the transformer (11) secondary side coil (112) outputs a stable and fixed second DC power source (V _out ).

Please refer to Figure 4B. When the boost type power factor correction circuit (20) uses a low voltage (such as 110V) AC power supply, its output capacitor (C _bulk ) outputs a first medium voltage DC power supply of about 200V. (V _BULK), this time the PWM controller of the present invention (13) controls the switch (SW) is normally closed short-circuit state, and then output two sets of inverted PWM signal of 50% to two active arm Switch (Q1) (Q3), and two lower arm active (Q2) (Q4) switches, meaning that the two upper arm active switches (Q1) (Q3) are a set of synchronous switch sets, and the two lower arm active switches (Q2) ( Q4) is another synchronous switch group. Thus, the intermediate connector of the primary side coil (111) of the transformer is grounded and independently formed into two coils (111a) that are connected in parallel through the two upper arm active switch (Q1) (Q3) or the two lower arm active switch (Q2) (Q4). (111b), in order to reduce the turns ratio (Na/2: Nb) of the primary side coil (111) and the secondary side coil (112) of the transformer (11), since the primary side coil (111) has two ends further connected in series Inductance and capacitance (Cr1, Lr1) (Cr2, Lr2), so when the two upper arm active switches (Q1) (Q3) are simultaneously turned on, the two parallel coils (111a) (111b) and the inductors and capacitors (Cr1, Lr1) (Cr2, Lr2) The resonant tank circuit is constructed. Similarly, when the two lower arm active switches (Q2) (Q4) are simultaneously turned on, the two parallel coils (111a) (111b) form a resonant tank circuit with the inductors and capacitors (Cr1, Lr1) (Cr2, Lr2). The transformer (11) turns ratio is proportional to the ratio of the first medium voltage DC power supply (V _BULK ) and the second DC power supply voltage (V _out ).

As can be seen from the above description, when the pulse width modulation controller (13) is applied to the boost power factor correction circuit (20), the control logic of the adjustment parameter program is as follows:

Referring to the fifth and sixth figures, another preferred embodiment of the power supply device of the present invention adopts a step-down power factor correction circuit (20a), wherein the step-down power factor correction circuit (20a) is The utility model comprises: an electronic switch (Q5), one end of which is connected to the output end of the rectifier (30); a storage inductor (L), one end of which is connected to the other end of the electronic switch (Q5); a diode (D), which is connected to the cathode-based electronic switch (Q5) and the energy storage inductor (L) connected in series node, an anode is connected to a ground terminal; a energy storage capacitor (C _bulk), connected to the inductor-based ( L1) between the other end and the ground, output a first DC power supply (V _BULK ) to the serial-parallel DC-to-DC power conversion circuit (10); a controller (M1') whose output is connected to the The control end of the electronic switch (Q5) and the output end of the corresponding signal detecting unit (40) are adjusted according to the signal detecting unit (40) to output a pulse width modulation signal to the control end of the electronic switch (Q5), and the control is further controlled. The device (M1') includes at least one error amplifier (M11), a second reference voltage terminal (V _ref2 ), and a switch driving unit (M12), wherein the error An input of the difference amplifier (M11) is connected to the reference voltage terminal (V _ref2 ), and the other input terminal is connected to the voltage divider series contact of the corresponding signal detecting unit (40).

The following is a further description of the circuit operation of the above-mentioned step-down power factor correction circuit: when the 220V high-voltage section AC power supply is currently connected, the comparator (41) of the signal detecting unit (40) outputs a high potential to drive the electronic switch. (Q) is turned on, so that the resistor (R13) is connected in parallel with the lower resistor (R12) of the voltage divider, so the voltage amplifier (M11) in the above controller (M1') is connected to the voltage divider (R11, R12). that bit will drop, thereby changing the switching drive unit (M12) of the electronic switch to the output (Q) of the PWM signal, so that each of the storage capacitors (C _bulk) high-voltage output of about 160V second direct current power source (V _BULK on ).

When the 110V low-voltage section AC power supply is currently connected, the comparator (41) of the signal detecting unit (40) outputs a low potential, so that the electronic switch (Q) is no longer turned on, so the resistor (R13) is no longer The lower resistors (R12) of the voltage dividers (R11, R12) are connected in parallel; at this time, the voltage level of the error amplifier (M11) and the voltage divider (R11, R12) in the above controller (M1') rises. And then changing the pulse width modulation signal outputted by the switch driving unit (M12) to the electronic switch (Q), and outputting about 80V second medium voltage DC power supply (V _BULK ) on each of the storage capacitors (C _bulk ) .

Therefore, the step-down power factor correction circuit (20a) of the switching power supply of the present invention does output a first DC power of different voltage magnitudes to the serial-parallel DC-DC power supply of the subsequent stage depending on the AC power supply voltage used. Conversion circuit.

Please refer to Figure 7A for further explanation of the circuit action of the series-parallel DC-to-DC power supply circuit (10) using a step-down preamplifier power factor correction circuit: when the step-down power factor correction circuit (20a) When a 220V AC power supply is used, a second high voltage DC power supply (V _BULK ) of about 160V is output, so the pulse width modulation controller (13) of the present invention must control the transformer (11') primary side coil (111') to maintain maximum The number of turns (Nc), that is, the upper arm active switch (Q3) that controls the second switch group (122) is turned off, and the lower arm active switch (Q4) is turned on, and simultaneously controls the switch (SW) to be normally open. In the open state, the transformer (11') primary side coil (111') constitutes a single coil, and its two ends are respectively connected between the series node of the first switch group (121') and the ground terminal, so that the turns ratio ( The Nc:Nd) matching pre-stage step-down power factor correction circuit (20) outputs a second high voltage DC power supply (V _BULK ) of approximately 160V. At this time, the pulse width modulation controller (13) further outputs two sets of pulse width modulation signals having a pulse width of 50% to the upper and lower arm active switch control terminals (G1) of the first switch group (121') (G2). ), the upper and lower arm active switches (Q1) (Q2) of the first switch group (121) are alternately opened and closed, and the inductors and capacitors (Cr1, Lr1) (Cr2, Lr2) are further connected in series at the two ends of the primary side coil (111'). Therefore, when the upper arm or the lower arm active switch (Q1) (Q2) of the first switch group (121) is turned on, the primary side coil (111) can be connected to the two sets of series-connected inductors and capacitors (Cr1, Lr1) (Cr2, LR2) constituting a resonant slot Dianlu (resonance tank), so that the transformer (11 ') of the secondary side coil (121') output stability and fixed second DC power supply (V _out).

Please refer to Figure 7B. When the step-down power factor correction circuit uses a 110V low-voltage AC power supply, its output capacitor (C _BULK ) outputs a second medium-voltage DC power supply (V _BULK ) of approximately 80V. The pulse width modulation controller (13) of the present invention controls the switch (SW) to be in a normally closed short circuit state, and then outputs two sets of inverted 50% pulse width modulation signals to the second upper arm active switch (Q1) (Q3). ), and the two lower arm active switch (Q2) (Q4), that is, the two upper arm active switch (Q1) (Q3) is a set of synchronous switch sets, and the two lower arm active switch (Q2) (Q4) is another synchronization Switch group. Thus, the intermediate joint of the primary side coil (111') of the transformer (11') is grounded and independently connected into two through two upper arm active switches (Q1) (Q3) or two lower arm active switches (Q2) (Q4) in parallel. Coil (111a') (111b') to reduce the turns ratio (Nc/2: Nd) of the primary side coil (111') and the secondary side coil (112') of the transformer (11') is lowered due to The two ends of the primary side coil are further connected in series with the inductance capacitors (Cr1, Lr1) (Cr2, Lr2), so when the two upper arm active switches (Q1) (Q3) are simultaneously turned on, the two parallel coils and the inductance and capacitance (Cr1, Lr1) ( Cr2, Lr2) constitute a resonant tank circuit. Similarly, when the two lower arm active switches (Q2) (Q4) are simultaneously turned on, the two parallel coils (111a') (111b') and the inductors and capacitors (Cr1, Lr1) (Cr2, Lr2) Forming a resonant tank circuit, the transformer (11') primary side coil (111') and secondary side coil (112') turns ratio and the second medium voltage DC power supply (V _BULK ) and the second DC power supply (V _out ) The voltage ratio is proportional.

As can be seen from the above description, when the pulse width modulation controller (13) is applied to the step-down power factor correction circuit (20a), the control logic of the adjustment parameter program is as follows:

According to the two embodiments mentioned above, the present invention can adjust the ratio of the transformer to the ratio of the DC power source and the low voltage DC power source according to the output power factor correction circuit of the preceding stage, so that the present invention is applied to the global type. The switching power supply can be used with different high-voltage or low-voltage AC power sources to actively adjust the appropriate transformer turns ratio, effectively improving the overall power conversion efficiency of the switching power supply.

(10). . . DC power conversion circuit

(11) (11’). . . transformer

(111) (111’). . . Primary side coil

(111a) (111a’). . . Coil

(111b) (11b’). . . Coil

(112) (112’). . . Secondary side coil

(12). . . Full bridge switching circuit

(121). . . First switch group

(20) (20a). . . Power factor correction circuit

(30). . . Rectifier

(40). . . Signal detection unit

(41). . . Comparators

(50). . . Full wave rectifier

(51). . . Power factor correction circuit

(511). . . Power factor correction controller

(52). . . DC power conversion circuit

(521). . . Pulse width modulation controller

(522). . . transformer

First Figure: is a circuit block diagram of a global switched power supply of the present invention.

Figure 2 is a detailed circuit diagram of a signal detecting unit used in the first preferred embodiment of the present invention.

Figure 3 is a detailed circuit diagram of a first preferred embodiment of the global switched power supply of the present invention.

Figure 4A: The third diagram is for the circuit action diagram of the high-voltage section AC power supply.

Figure 4B: The third diagram is for the circuit action diagram of the low-voltage section AC power supply.

Figure 5 is a detailed circuit diagram of a second preferred embodiment of the global switched power supply of the present invention.

Figure 6 is a detailed circuit diagram of a signal detecting unit used in the second preferred embodiment of the present invention.

Figure 7A: The fifth diagram is for the circuit action diagram of the high-voltage section AC power supply.

Figure 7B: The fifth diagram is for the circuit action diagram of the low-voltage section AC power supply.

Figure 8: Detailed circuit diagram of a global switched power supply.

(10). . . DC power conversion circuit

(11). . . transformer

(111). . . Primary side coil

(111a). . . Coil

(111b). . . Coil

(112). . . Secondary side coil

(12). . . Full bridge switching circuit

(121). . . First switch group

(13). . . Pulse width modulation controller

Claims (14)

A global switching power supply includes: a rectifier connected to an AC power source for converting AC power into a DC sine wave power source; and a signal detecting unit for detecting the current input AC power voltage. And outputting a detection signal; a power factor correction circuit, the input end of which is connected to the output end of the rectifier and the output end of the signal detection unit, and adjusts the voltage of the output of the first DC power supply according to the current input AC power supply voltage And a series of parallel DC-to-DC power conversion circuit, the input end of which is connected to the output end of the power factor correction circuit and the signal detection unit to receive the first DC power supply and convert it into the second DC After the power supply, the serial-parallel DC power conversion circuit adjusts the turns ratio of the primary side coil and the secondary side coil of the transformer according to the ratio of the first direct current power source and the second direct current power source voltage, so that the transformer turns ratio and the first A DC power supply is proportional to a second DC power supply voltage ratio. The global type switching power supply device of claim 1, wherein the signal detecting unit comprises: a low pass filter connected to the output end of the rectifier to further filter the DC sine wave into a direct current a comparator; one of the inputs is connected to the low-pass filter, the other input is connected to a first reference voltage, and after the comparison, the high-low potential DC signal is output; and an electronic switch, the control terminal is Connected to the output end of the comparator, the electronic open relationship is connected in series with a resistor; and a voltage divider is composed of two resistors connected in series, wherein the lower resistor is connected in parallel with the serially connected electronic switch and the resistor, and the branch The series node of the voltage device is connected to a corresponding power factor correction circuit. The power conversion correction circuit is a booster circuit, comprising: a storage inductor, one end of which is connected to the output end of the full-wave rectifier, as in the global switched power supply described in claim 2; An energy storage capacitor is connected between the other end of the energy storage inductor and the ground end, and outputs a first DC power supply to the serial DC-DC power conversion circuit; an electronic switch is connected to the energy storage inductor And a storage capacitor node and the ground; and a controller, the output end of which is connected to the control end of the electronic switch and the output end of the corresponding voltage detecting circuit, and adjusts the output of the electronic switch control terminal according to the voltage detecting circuit a pulse width modulation signal, the controller further comprising at least one error amplifier, a second reference voltage terminal and a switch driving unit, wherein the error amplifier has an input connected to the reference voltage terminal and the other input terminal Connect to the voltage divider series contact of the corresponding voltage detection circuit. The power factor correction circuit is a step-down circuit, comprising: an electronic switch, one end of which is connected to an output end of the full-wave rectifier, as in the global switching power supply described in claim 2; a storage inductor having one end connected to the other end of the electronic switch; a diode having a cathode connected to the electronic switch and the energy storage inductor in series, the anode connected to the ground; and an energy storage capacitor, Is connected between the other end of the energy storage inductor and the ground end, and outputs a first DC power supply to the serial-parallel DC-DC power conversion circuit; a controller whose output end is connected to the control end of the electronic switch and The output end of the corresponding voltage detecting circuit adjusts a pulse width modulation signal to the electronic switch control end according to the voltage detecting circuit, and the controller at least includes an error amplifier, a second reference voltage terminal and a switch driving unit Wherein an input of the error amplifier is connected to the reference voltage terminal, and the other input is connected to a voltage divider series connection of the corresponding voltage detection circuit. The serial-type DC-DC power conversion circuit according to the third or fourth aspect of the patent application, the series-parallel DC-DC power conversion circuit includes: a transformer, a primary side coil including a center tap, and a second time a side coil; a full bridge switching circuit comprising two first and second switch groups in parallel, each active switch group comprising an upper arm active switch and a lower arm active switch connected in two phases, and the first and The series node of the second switch group is connected to the two ends of the primary side coil of the transformer; a switch is connected between the center tap of the primary side coil of the transformer and the ground; and a pulse width modulation controller is connected to the first The second upper arm active switch of the first switch group and the second lower arm active switch and the control end of the switch, and an input end of the pulse width modulation controller is connected to the series of the voltage divider of the signal detecting unit The contact, according to the output voltage of the power factor correction circuit, performs a parameter adjustment procedure, that is, by controlling the active switch of the full bridge switch circuit and the opening and closing state of the switch, adjusting the matching Transformer turns ratio of the output voltage, and then after the DC conversion process. For example, the serial-parallel DC-to-DC power conversion circuit described in claim 5, wherein the pulse width modulation controller has a parameter adjustment program including: controlling the second switch when determining the use of the high-voltage section AC power supply The upper arm active switch of the group is turned off, and the lower arm active switch is turned on, and simultaneously controls the switch to be normally open and open, and outputs two sets of pulse width modulation signals with a pulse width of 50% to the first switch. The upper and lower arms of the group actively switch the control end to alternately open and close the upper and lower arm active switches of the first switch group; when determining the use of the low voltage power supply, the upper arm active switch and the lower arm active switch of the first and second switch groups They are two sets of synchronous switch groups, and control the switch to be normally closed short-circuit state, and simultaneously output two sets of pulse width modulation signals with a pulse width of 50% to the corresponding synchronous switch group. For example, in the series-parallel DC-to-DC power conversion circuit described in claim 6, the switching relationship is a relay. For example, in the serial-parallel DC-to-DC power conversion circuit described in claim 6, the active open relationship may be a MOSFET or an IGBT. For example, in the series-parallel DC-to-DC power conversion circuit described in claim 7, the active open relationship may be a MOSFET or an IGBT. A serial-parallel DC-to-DC power conversion circuit includes: a transformer including a primary side coil and a secondary side coil; and a full bridge switching circuit comprising two parallel first and second The switch group, each active switch group includes an upper arm active switch and a lower arm active switch connected in two phases, and the series node of the first and second switch groups is connected with the transformer primary side coil two ends; a switch , is connected between the middle tap of the transformer and the ground end of the transformer; a pulse width modulation controller is connected to the two upper arm active switches of the first and second switch groups and the two lower arm active switches and the switch The control terminal; the pulse width modulation controller performs a parameter adjustment procedure according to the output voltage of the pre-stage power factor correction circuit, that is, by controlling the active switch of the full bridge switch circuit and the opening and closing state of the switch, The transformer turns ratio of the matched output voltage is adjusted, and then the DC conversion process is performed. For example, the serial-parallel DC-to-DC power conversion circuit described in claim 10, wherein the pulse width modulation controller has a parameter adjustment program including: controlling the second switch when determining the use of the high-voltage section AC power supply The upper arm active switch of the group is turned off, and the lower arm active switch is turned on, and simultaneously controls the switch to be normally open and open, and outputs two sets of pulse width modulation signals with a pulse width of 50% to the first switch. The upper and lower arms of the group actively switch the control end to alternately open and close the upper and lower arm active switches of the first switch group; when determining the use of the low voltage power supply, the upper arm active switch and the lower arm active switch of the first and second switch groups They are two sets of synchronous switch groups, and control the switch to be normally closed short-circuit state, and simultaneously output two sets of pulse width modulation signals with a pulse width of 50% to the corresponding synchronous switch group. The switching-on relationship is a relay, as in the series-parallel DC-to-DC power conversion circuit described in claim 10 or 11. For example, in the series-parallel DC-to-DC power conversion circuit described in claim 10 or 11, the active open relationship may be a MOSFET or an IGBT. For example, in the series-parallel DC-to-DC power conversion circuit described in claim 12, each active open relationship may be a MOSFET or an IGBT.