CN101902204B - Power supply method, power source device and base station radio frequency system for power amplification - Google Patents

Abstract

The invention provides a power supply method, a power supply device and a power supply system for power amplification. The power supply method comprises that: control equipment controls the switching on or off of N pieces of first switch equipment according to the received current given signal, so that current sources of N branches output the current which corresponds to the current given signal; when the first switch equipment is switched off, a current source on a corresponding branch outputs current to the second switch equipment; when the first switch equipment is switched on, the current source on the corresponding branch is in grounded short circuit; the second switch equipment is used for unidirectionally transmitting the current, transmitting the current output by the current source to the load, and preventing the current from flowing from the load to the first switch equipment; and a linear amplification unit amplifies the received voltage signal to be amplified so as to present a linear relationship between the amplified voltage signal and the voltage signal to be amplified, and regulates the voltage of the load to that of the amplified voltage signal. Therefore, the current passing through the switch equipment is reduced, and the speed of the switch equipment is improved. Due to the no-floating ground characteristic, the switch equipment is easy to control.

Description

Power supply method, power supply device and base station radio frequency system for power amplification

technical field

The invention relates to the field of power supply and power amplification, in particular to a power supply method for power amplification, a power supply device and a base station radio frequency system.

Background technique

There are two types of power amplifiers: linear power amplifiers and nonlinear power amplifiers. Linear power amplifiers are not easy to generate harmonics, and the signal is realistic, but the efficiency of linear power amplifiers is low; while nonlinear power amplifiers do not have very high requirements for harmonic distortion, such as the developing class D power amplifiers. Nonlinear power amplifiers mainly use pulse width modulation technology (PWM technology) to achieve power amplification, which can obtain high efficiency.

In the wireless field, broadband is increasingly developed, and the transmitted signal is no longer a constant amplitude signal. In order to improve the utilization of spectrum resources, broadband modulation is generally a non-constant envelope modulation, that is to say, the amplitude of the radio frequency changes with time. In order to ensure the fidelity of the amplitude information and prevent harmonics from interfering with adjacent channels, the power amplifier generally works online. sexual way. When the amplitude decreases to a small value with time, the utilization rate of the power supply is very low, and most of the voltage of the power supply is added to the drain of the power amplifier tube, which becomes heat loss.

At present, in order to improve the utilization rate of the power supply, an envelope tracking (ET, envelope Tracking) technology is proposed. ET technology is: when the amplitude becomes smaller, the power supply voltage is reduced accordingly, and the voltage on the drain is also reduced, thereby reducing heat loss and improving power amplifier efficiency. Envelope elimination and restoration (EER, envelope elimination and restoeration) has a faster envelope change speed than ET technology, but the power amplifier in ET technology works linearly, while the power amplifier of EER works in class E and class F In EER, the envelope information is all added to the power supply, and the amplitude modulation is completed by the power supply. As long as the efficiency of the power supply itself is high, the overall efficiency of the EER power amplifier will also be high.

As shown in Figure 1, it is a circuit diagram of the power supply of ET in the prior art; in this figure, the power supply of ET includes: N voltage sources (shown as V1-Vn in the figure), each voltage source is connected in series with a switch (Fig. Shown in S1-Sn) and a diode (shown in D1-Dn in the figure), in addition, it also includes a comparator; when each switch is turned on, the corresponding control and drive will send the corresponding reference voltage to the corresponding switch The comparator corresponding to the switch compares the envelope signal from the detector with the received N reference voltages, and selects one voltage as the output voltage to supply power to the load according to the comparison result.

During the research and practice of the prior art, the inventors of the present invention found that in the existing implementation, a switch needs a metal-oxide-semiconductor-semiconductor with a large current capacity to flow all the current required by the load. Field-effect transistors (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor) are used as switching elements, and the gate charge Qg required to turn on a high-current MOSFET is large, which affects the switching speed. In addition, because the MOSFET floats, the controllability is poor.

Contents of the invention

Embodiments of the present invention provide a power supply method for power amplification, a power supply device, and a base station radio frequency system to reduce the current passing through the switchgear and increase the speed of the switchgear; since the switchgear is not floating, it is easy to control; when increasing the feedback Signal, can effectively improve the accuracy of the power supply.

For this reason, the present invention provides a power supply device for power amplification in an embodiment, including: a linear amplification unit, a control device and N branches connected in parallel, where N is an integer not less than 2; wherein each branch The circuit includes a current source, a first switch device and a second switch device; the first switch device on each branch is respectively connected to the current source on the branch and the second switch device on the branch;

N current sources for outputting N currents respectively;

The control device is configured to receive a given current signal, and control the closing or opening of the N first switching devices according to the given current signal;

The first switch device is used to open or close according to the control of the control device; when the first switch device is disconnected, the current source on the corresponding branch outputs current to the second switch device; when the first switch device is closed , the current source on the corresponding branch is short-circuited to ground;

The second switching device is used for unidirectional transmission of current, transmitting the current output by the current source to the load, and preventing the current from flowing from the load to the first switching device;

The linear amplifying unit is connected to the output terminal of the second switching device, and is used to amplify the received voltage signal to be amplified, so that the amplified voltage signal has a linear relationship with the voltage signal to be amplified, and adjust the load voltage to the amplified voltage signal;

Wherein, the given current signal and the voltage signal to be amplified are in a linear relationship or a time-delay relationship.

Correspondingly, an embodiment of the present invention provides a power supply method for power amplification, based on the above power supply device, including:

The control device controls the closing or opening of the N first switching devices according to the received current given signal, so that the current sources of the N branches output the current corresponding to the current given signal, and N is an integer not less than 2 ;

When the first switch device is turned off, the current source on the corresponding branch outputs current to the second switch device; when the first switch device is closed, the current source on the corresponding branch is short-circuited to ground; wherein, the first switch device The second switch device is used for unidirectional transmission of current, and transmits the current output by the current source to the load, preventing the current from flowing from the load to the first switch device;

The linear amplification unit amplifies the received voltage signal to be amplified, so that the amplified voltage signal has a linear relationship with the voltage signal to be amplified, and adjusts the voltage of the load to the amplified voltage signal;

Wherein, the given current signal and the voltage signal to be amplified are in a linear relationship or a time-delay relationship.

Correspondingly, an embodiment of the present invention also provides a base station radio frequency system, including the above-mentioned power supply device, radio frequency power amplifier and radio frequency antenna;

The power supply device is used to supply power to the radio frequency power amplifier;

The radio frequency power amplifier is used as a load of the power supply device to amplify the input signal of the radio frequency power amplifier and output the output signal of the radio frequency power amplifier;

The radio frequency antenna is used to send the output signal of the radio frequency power amplifier.

It can be seen from the above technical solution that the embodiment of the present invention uses N current sources so that the current flowing through a single switch tube is very small, and the low current device can easily obtain high speed; since the switch device is directly grounded, that is, the switch device is not floating, so The switching device is easy to control; it can be seen that the embodiment of the present invention can realize high-speed voltage regulation, which can improve the efficiency and linearity of the power amplifier when applied to radio frequency ET or EER power amplifiers; it can play the role of energy saving and performance improvement.

Description of drawings

Fig. 1 is the circuit diagram of the power supply of ET in the prior art;

FIG. 2 is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 1 of the present invention;

3 is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 2 of the present invention;

FIG. 4 is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 3 of the present invention;

5 is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 4 of the present invention;

FIG. 6 is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 5 of the present invention;

7 is a schematic circuit diagram of a power supply device for power amplification according to Embodiment 1 of the present invention;

FIG. 8 is a signal waveform diagram of input signal 1 in an embodiment of the present invention;

Fig. 9 is a signal waveform diagram of input signal 2 in an embodiment of the present invention;

10 is a signal waveform diagram of a current source in an embodiment of the present invention;

Fig. 11 is a signal waveform diagram of pulse ladder wave current in an embodiment of the present invention;

Fig. 12 is a signal waveform diagram of load current in an embodiment of the present invention;

Fig. 13 is a signal waveform diagram of a load voltage in an embodiment of the present invention;

14 is a schematic circuit diagram of a power supply device for power amplification according to Embodiment 3 of the present invention;

15 is a schematic circuit diagram of a power supply device for power amplification according to Embodiment 2 of the present invention;

16 is a schematic circuit diagram of a power supply device for power amplification according to Embodiment 4 of the present invention;

17 is a schematic circuit diagram of a power supply device for power amplification according to Embodiment 5 of the present invention;

FIG. 18 is a flowchart of a power supply method for power amplification provided by an embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a base station radio frequency system provided by an embodiment of the present invention.

Detailed ways

Below we will describe in detail the best implementation of the present invention with reference to the accompanying drawings.

Please refer to FIG. 2, which is a schematic structural diagram of a power supply device for power amplification provided by Embodiment 1 of the present invention. In this embodiment, the power supply device for power amplification includes: a linear amplification unit 21, a Control device 22 and N current branches; wherein, each current branch includes a current source, a first switching device and a second switching device; the first switching device on each current branch is connected to the current source and the second switching device respectively The two open pipe devices are connected. Specifically as shown in Figure 2, the power supply device specifically includes: a linear amplification unit 21, a control device 22, N current sources 23, N first switching devices 24 and N second switching devices 25; N current sources 23 , N first switching devices 24 and N second switching devices 25 form N current branches respectively.

The N current sources 23 are used to output current to the first switch device, or the second switch device and the load.

The control device 22 is configured to receive a given current signal, and send a control signal to one or more first switching devices according to the given current signal, so that the outputs of the N current branches correspond to the given current signal The current; specifically, N current sources can be made to output a current that has an approximately linear relationship with the current given signal, because the output current is a ladder wave, and the current given signal may be various regular or irregular waveforms Or a digital signal, so the current output by the N current branches corresponding to the given current signal does not necessarily have a completely linear relationship with the given current signal, but has an approximately linear relationship. Wherein, the given current signal may include: the voltage signal obtained by converting the voltage signal to be amplified, the voltage signal fed back by the load, or the voltage signal fed back from the output terminal of the linear amplification unit 21; or, the processor, data signal processing The voltage signal output by the device or the analog circuit is used as the given current signal, and the relationship between the output voltage signal and the voltage signal to be amplified is a delay relationship or a functional relationship, wherein, when the output voltage signal and the When the relationship between the voltage signals to be amplified is a delay relationship, the voltage signal to be amplified lags behind the given current signal. Of course, the given current signal may also be a signal output by other devices, which is not limited in this embodiment.

The first switch device 24 is configured to open or close according to the control signal sent by the control device 22. When the first switch device 24 is turned off, the current source on the corresponding branch outputs current to the second switch device 25 and load; when the first switching device 24 is closed, the current output by the current source 23 on the corresponding branch is short-circuited to ground.

The second switch device 25 has a unidirectional conduction function and is used for unidirectional transmission of current; when the first switch device is turned off, it outputs the current output by the current source on the corresponding branch to the load, that is, The second switch device 25 outputs the received current output by the first switch device 24 to the load, and prevents the current from returning to the first switch device from the load; or when the first switch device is closed, the second switch device 25 is turned off , preventing current from flowing from the load to the first switching device.

The linear amplifying unit 21 is connected to the output end of the second switching device, and is used to amplify the received voltage signal to be amplified, so that the amplified voltage signal and the voltage signal to be amplified are in a linear relationship, and adjust the load voltage to the amplified voltage signal. When adjusting the voltage of the load to the amplified voltage signal, the amplified voltage signal can be directly loaded to both ends of the load.

In other embodiments, referring to the schematic structural diagram of Embodiment 2 shown in FIG. 3 , the power supply device for power amplification may further include: a signal conversion unit 26, configured to perform the received voltage signal to be amplified. Some kind of conversion (such as proportional operation), the converted voltage signal is used as a given current signal, and the given current signal is output to the control device 22 .

In other embodiments, referring to the schematic structural diagram of Embodiment 3 shown in FIG. 4, the power supply device for power amplification may further include: a current detection unit 27, connected to the load, used to detect the current of the load, and The detected current signal is output to the control device 22 as a given current signal.

In other embodiments, referring to the schematic structural diagram of Embodiment 4 shown in FIG. 5, the power supply device for power amplification may further include: a feedback unit 28, configured to receive the feedback signal output from the output terminal of the linear amplification unit , and output the feedback signal to the control device 22 as a given current signal.

In other embodiments, referring to the schematic structural diagram of Embodiment 5 shown in FIG. 6, the power supply device for power amplification may further include: a compensation unit 29, configured to receive the voltage to be amplified input to the unit to be amplified The signal and the load voltage are compensated according to the error between the voltage signal to be amplified and the sampling signal of the load voltage, and the compensated current is output to the load.

Preferably, in the above embodiment, the power supply device for power amplification may further include: a capacitive filter unit, configured to filter the received current output through the second switching device to obtain a smooth current, and This smoothed current is output to the load.

The first switch device 24 may be: a single-pole switch or other devices with similar functions and functions; the second switch device may be: a single-pole switch or a diode, or other devices with similar functions and functions.

In the embodiment of the present invention, the control device 22 may be: a comparator, or an analog-to-digital converter, or a digital processor and a drive control circuit; the linear amplification unit 21 may be: a linear amplifier.

In order to facilitate the understanding of those skilled in the art, specific embodiments are described below.

Please also refer to FIG. 7, which is a schematic circuit diagram of a power supply device for power amplification provided in Embodiment 1 of the present invention; in this embodiment, the voltage signal to be amplified is input signal 1 (in this embodiment, the input signal 1 is the voltage signal) as an example, and the current given signal takes the input signal 2 as an example, as shown in Figure 7, including: N current sources ① (I1, I2, ..., In), N diodes ③ ( D1, D2,...Dn, this embodiment takes diodes as an example as the second switch device, but it is not limited to this), N switch devices ② (SW1, SW2...SWn, this embodiment takes switch devices as an example as the first switching device, but not limited thereto), the control circuit ④, and the linear amplification unit ⑤. N current sources ① are respectively connected to the load through N diodes ③, and at the same time, connected to the ground through N switching devices ②. When a switch device ② is disconnected, the current output by the corresponding current source flows to the load through the diode ③. At the same time, the diode ③ also has the function of preventing the current from returning from the load; when the switch device ② is closed, the corresponding current source ① outputs current is shorted to ground. The control circuit ④ is used to output a suitable control signal to control the switching device ② according to the received input signal 2, combined with its own parameters, and output a current that is basically linear with the input signal 2; for example, the comparison in the control circuit ④ A device or an analog-to-digital converter (ADC, analog-to-digital converter) compares the received input signal 2 with several reference signals set by itself to obtain a control signal, and controls each switching device according to the control signal② The closed or disconnected, so that the output of a current that is approximately linear with the input signal 2; for example, assuming there are two comparators, set the two reference signals to 1V and 2V, respectively, corresponding to the current 1A and 2A, then , when the input signal 2 reaches 1V, a comparator flips and outputs a low level to turn off the first switch of the switching device ②, and outputs 1A current to the load. When the input signal 2 reaches 2V, the other comparator also flips the output Low level, to turn off the second switch of the switching device ②, so that a current of 2A can be output to the load. The input signal 2 has a certain functional relationship with the input signal 1, and the functional relationship may include a linear relationship or a time-delay relationship; Signal 1 and input signal 2 arrive at the output at the same time, and generally, input signal 2 can be intentionally ahead of input signal 1. The input signal 2 may be a load voltage or a load voltage envelope fed back from the rear end (such as a load); the input signal 2 may also be a signal directly sent by the front end; this embodiment does not limit it.

In this embodiment, for the values of I1, I2...In, the same value can be taken, refer to Figure 10; different values can also be taken, such as taking values according to binary weights, for example, there are 4 current sources, which can be respectively Take 8A (ampere), 4A, 2A, 1A, so that 4 current sources can output 16 kinds of current values.

The linear amplifying unit ⑤ can amplify the received input signal 1 relatively accurately, so that the output voltage and the input signal 1 have an accurate linear relationship. The linear amplifying unit can introduce the feedback signal from the output terminal, or not. This embodiment is not limited. The linear amplifying unit ⑤ may be a linear amplifier.

In this embodiment, the current source ① provides most of the current, while the linear amplifying unit ⑤ only provides a small part of the current, so that the loss of the linear link (ie, the linear amplifying unit ⑤) is greatly reduced. The linear amplifying unit ⑤ may include a linear amplifier, and the input signal 1 at the input terminal of the linear amplifier may be the envelope signal of the radio frequency to be amplified.

The specific implementation process of this embodiment includes: the current source ① outputs a pulse ladder wave current Io1 (refer to Figure 11) after passing through the switch device ② and the diode ③. For rectification and filtering, this embodiment takes capacitor C1 as an example to rectify the ladder current Io1 into a relatively smooth current Io (refer to Figure 12), and then output it to the load; wherein, the capacitor filter unit can include a capacitor C1, and C1 is not necessarily Lumped parameters, possibly parasitic capacitance of the device, etc.

If the voltage Vout output to the load changes at a high speed, it is necessary to reduce the capacity of C1 as much as possible. In order to reduce the error and reduce the degree of distortion, the linear amplification unit ⑤ is used to correct the error. The linear amplifier unit ⑤ has voltage following characteristics, and the output voltage through the linear amplifier ⑤ has a linear relationship with the input voltage, which is expressed in mathematical expressions as follows:

Vout=V0+k*vi,

Among them, Vout is the output load voltage, vi is the input signal 1, V0 and k are real constants.

Connect the output terminal of the linear amplification unit ⑤ to the output terminal of the diode ③, when the output current Io1 is greater than the load current Io, the linear amplification unit ⑤ absorbs excess current (Io1-Io); when Io1 is smaller than the load current Io, the linear The amplifier ⑤ provides insufficient current (Io-Io1); since the load impedance is constant, the output voltage Vout is proportional to the load current Io, so that the output voltage of the entire power supply changes with the change of the input signal 1. Wherein, the input signal 1 and the input signal 2 have a certain functional relationship, and the functional relationship includes a time delay relationship. The waveforms of the signals in the embodiment of the present invention are shown in FIGS. 8 to 13 as examples. (This embodiment takes the signals output by n current sources as an example), where Fig. 8 and Fig. 9 are the signal waveform diagrams of input signal 1 and input signal 2 in the embodiment of the present invention respectively, and Fig. 10 is the current in the embodiment of the present invention Source 1. signal waveform diagram, Fig. 11 is the signal waveform diagram of output current Io1 in the embodiment of the present invention, output current Io1 is the pulse ladder current in Fig. 11, Fig. 12 is the signal waveform diagram of load current Io in the embodiment of the present invention , FIG. 13 is a signal waveform diagram of the load voltage Vout in the embodiment of the present invention.

In the embodiment shown in Fig. 7, the linear amplifying unit ⑤ can introduce feedback to improve the tracking accuracy, and the feedback is drawn from the output terminal of the linear amplifying unit ⑤, and fed back to the input terminal of the linear amplifying unit ⑤, shown by the dotted line in Fig. 7 Shows. Whether the linear amplifier unit ⑤ introduces feedback is optional, that is to say, feedback is not necessary; when no feedback is used, although the tracking accuracy may be worse, it is less likely to oscillate and has better stability when working. In other embodiments, the linear amplifying unit ⑤ can introduce feedback to improve tracking accuracy, which will not be described in detail below.

Please also refer to FIG. 14 , which is a schematic circuit diagram of a power supply device for power amplification provided in Embodiment 3 of the present invention; in this embodiment, the current given signal takes the load current or the load current envelope as an example, The signal to be amplified takes the radio frequency envelope signal, that is, the envelope voltage as an example. On the basis of the embodiment in FIG. 7, the power supply may also include a current detection unit. As an example, but not limited thereto, specifically as shown in FIG. 14 .

In this embodiment, at the moment when the current source ① is powered on, all the switching devices ② may be in an uncertain state (of course, the circuit can also be forced to a certain state), and all the current sources ① may provide a large Power, at this time, the linear link loss may be large. But then, the linear amplifier unit ⑤ (take the linear amplifier as an example) will adjust the voltage across the load to an appropriate value according to the received voltage signal to be amplified. For example, the linear amplifier unit ⑤ will amplify the voltage signal to be amplified to generate an amplified The voltage signal, and then add the amplified voltage signal to the load, so that the voltage of the load is equal to the amplified voltage signal. The specific process is: when the voltage signal to be amplified increases, the linear amplifying unit ⑤ will follow up immediately to increase the load voltage to the size of the amplified voltage signal. At this time, the increase of the load voltage will lead to an increase of the load current. The increased load current is provided by the linear amplification unit ⑤, and then the control circuit ④ will detect the increased load current, output the corresponding control signal to control the corresponding switching device ②, and disconnect one or more switching devices ②, thus Increase the current output from the current source to the load, that is, increase the number of output current sources to make the output current large enough until the current output to the load is mainly provided by the current source ①, and finally the linear amplification unit ⑤ only provides to the load ( Or absorb) a small part of the current, so that the loss of the linear link is greatly reduced; on the contrary, when the voltage signal to be amplified decreases and the load current decreases, the linear amplification unit ⑤ will absorb the excess current, and then the control circuit ④ This reduced load current will be detected, thereby reducing the number of output current sources to make the output current small enough until it is close to the load current, and the linear amplification unit ⑤ in the family only provides (or absorbs) a A small part of the current, so that the loss of the linear link is greatly reduced. In order to reduce the loss of the linear amplifying unit ⑤, it is necessary to make the time for the linear amplifying unit ⑤ to pass a large current as short as possible, therefore. Control and drive devices such as comparators in the control circuit should use high-speed devices to reduce delay. Diode Dn (n=1, 2, 3, . . . ) in FIG. 14 is used to prevent the load from being short-circuited when SWn (n=1, 2, 3, . . . ) is closed. The diode can also be replaced with other controllable semiconductor switches such as MOSFET (metal-oxide-semiconductor field-effect, metal-oxide-semiconductor field-effect transistor).

Please also refer to Figure 15, which is a schematic circuit diagram of a power supply device for power amplification provided in Embodiment 2 of the present invention; in this embodiment, the input signal 1 is taken as an example for the voltage signal to be amplified, and the current given signal Taking the input signal 2 as an example, that is, the envelope voltage of the radio frequency envelope signal as an example, this embodiment is based on the embodiment in Figure 7, and the power supply device can also include a signal conversion unit ⑧ for converting the received signal The input signal 1 is converted, the converted signal is used as the input signal 2, and the input signal 2 is output to the control circuit ④. That is, in this embodiment, the signal conversion unit ⑧ takes the input signal 1, undergoes some processing (such as proportional operation) according to the load characteristics, and uses the converted signal as the input signal 2, and then outputs it to the control circuit ④ to control According to the input signal 2, the circuit ④ controls the multi-channel current source ① to supply power to the load. Wherein, the scaling operation may be scale-up or scale-down, etc., that is, the input signal 1 is scaled up or scaled down to generate a processed signal, and the processed signal is used as the input signal 2 .

Please also refer to Figure 16, which is a schematic circuit diagram of a power supply device for power amplification provided in Embodiment 4 of the present invention; in this embodiment, the input signal 1 is taken as an example for the voltage signal to be amplified, and the current given signal Taking the input signal 2 as an example, on the basis of the embodiment in Fig. 7, the power supply device may also include a signal feedback unit ⑨, which is used to receive the feedback signal returned by the output terminal of the linear amplification unit, and convert the feedback signal to It is output as a given current signal to the control device. In this embodiment, after receiving the signal output by the linear amplifier, the feedback unit ⑨ performs some processing (such as voltage division) on the signal and then inputs it as the input signal 2 to the control circuit ④ Then, according to the input signal 2, the control circuit ④ controls the multi-channel current source ① to supply power to the load. For other implementation processes of this embodiment, refer to the description in FIG. 7 for details, and details are not repeated here.

Please also refer to Figure 17, which is a schematic circuit diagram of a power supply device for power amplification provided in Embodiment 5 of the present invention; in this embodiment, the input signal 1 is taken as an example for the voltage signal to be amplified, and the current given signal Taking the input signal 2 as an example, that is, the envelope voltage of the radio frequency envelope signal as an example, this embodiment is based on the embodiment in Figure 7, and the power supply device can also include a compensation unit ⑩ for receiving the voltage signal to be amplified and load voltage, and compensate the error between the voltage signal to be amplified and the load voltage, and input the compensated voltage to the load. The compensation unit ⑩ may include: a compensation current source Ix, a third switching device (taking SWx as an example), a fourth switching device (taking a diode Dx as an example), and an error amplification unit ⑧. Wherein, the error amplification unit ⑧ may include: an error amplifier, a control and a driving circuit. In this embodiment, the compensation current source is used to output current to the load; the error amplification unit ⑧ is used to receive the voltage signal to be amplified and the load voltage, and amplify the voltage signal to be amplified and the According to the error of the load voltage, a control signal is sent to the third switch to control the closing or opening of the third switch device according to the error; the third switch device is used to perform according to the control signal sent by the error amplification unit closed or disconnected; when the third switch device is disconnected, the current output by the compensation current source Ix is output to the fourth switch device; when the third switch device is closed, the current output by the corresponding current source is short-circuited to ground; the first The four switching devices are used to output the current output by the third switching device to the load and prevent the current from returning from the load. Wherein, the third switch device may be: a single-pole switch or other devices with similar functions and functions; the fourth switch device may be: a single-pole switch or a diode, or other devices with similar functions and functions.

Specifically, as shown in Figure 17, when the number of circuits of the current source ① is too many, the circuit will become too complicated; when the number of circuits is too small, the error is too large and the heat consumption of the linear amplifier ⑤ increases. For this reason, a compensation unit ⑩ is added in this embodiment. Since the output current of the compensation unit ⑩ is not large, it can work at a very high frequency. The control method can be pulse width modulation (PWM, Pulse Width Modulation), frequency conversion modulation (PFM, Pulse Frequency conversion Modulation), or hysteresis control. Hysteresis control response speed block. The output current of the compensation unit ⑩ can offset the error current and maintain a sufficiently high efficiency. The input signal of the compensation unit ⑩ and the input of the linear amplifier can be the same signal or signals in a linear relationship. For other implementation processes of this embodiment, refer to the description in FIG. 7 for details, and details are not repeated here.

It can be seen that the embodiments of the present invention are mainly aimed at the field of radio frequency power amplifiers, but are not limited to this field. The power supply device manufactured by the method of the present invention can have a very high dynamic voltage regulation speed, which can reach any high speed theoretically; it can have good fidelity and high efficiency; using the technology of the embodiment of the present invention The ET power supply of the radio frequency power amplifier manufactured can obtain high efficiency; the EER power supply of the radio frequency power amplifier manufactured by the embodiment of the present invention can obtain high efficiency and excellent linearity. Compared with the prior art, the present invention uses a single switch tube with very small current, and the small current device can easily obtain high speed; the switch device does not float, and is easy to control; if feedback is added, the stability is also good. That is to say, the embodiments of the present invention can be applied to any occasion requiring voltage regulation and power amplification. Such as RF power amplifier, audio power amplifier and so on. Among them, when realizing high-speed voltage regulation, applying it to RF ET or EER power amplifier can improve the efficiency and linearity of the power amplifier; thus it can save energy and improve performance.

Based on the implementation process of the functions and functions of the specific embodiment of the power supply device above, correspondingly, the embodiment of the present invention also provides a power supply method for power amplification, the flow chart of which is shown in Figure 18, and the method includes:

Step 201: the control device controls the closing or opening of the N first switching devices according to the received current given signal, so that the current sources of the N branches output the current corresponding to the current given signal;

Step 202: When the first switch device is turned off, the current source on the corresponding branch outputs current to the second switch device; when the first switch device is closed, the current source on the corresponding branch is short-circuited to ground; wherein, The second switch device is used for unidirectional transmission of current, transmits the current output by the current source to the load, and prevents the current from flowing from the load to the first switch device;

Step 203: The linear amplifying unit amplifies the received voltage signal to be amplified so that the amplified voltage signal has a linear relationship with the voltage signal to be amplified, and adjusts the voltage of the load to the amplified voltage signal.

Wherein, the given current signal specifically includes any of the following:

converting the received voltage signal to be amplified, and using the converted voltage signal as a given current signal; or

Detect the current of the load, and use the detected current signal as the current given signal; or

using the feedback signal at the output end of the linear amplification unit as a given current signal; or

The voltage signal to be amplified is processed, and a voltage signal with a delay relationship or a function relationship with the voltage signal to be amplified is generated as a current given signal.

In addition, the given current signal and the voltage signal to be amplified may also have a time-delay relationship or a certain functional relationship with each other. That is to say, the given current signal can also be a signal directly output by other devices (such as a processor, a data signal processor, or an analog circuit, but not limited thereto), and the output signal and the voltage signal to be amplified are mutually related There can be a delay relationship or some kind of functional relationship between them. When there is a delay relationship, generally the voltage signal to be amplified lags behind the given current signal.

Wherein, the method may also include:

The current output by the second switching device is filtered to obtain a smooth current, and the smooth current is output to the load.

For the implementation process of each step in the method, refer to the corresponding implementation process in the above device embodiment for details, and details are not repeated here.

Correspondingly, the embodiment of the present invention also provides a base station radio frequency system, whose structural diagram is shown in Figure 19 for details. The base station radio frequency system includes: any power supply device 191 for power amplification described above, as well as a radio frequency power amplifier 192 and a radio frequency antenna 193; wherein, the power supply device 191 is used to supply power to the radio frequency power amplifier; the radio frequency power amplifier 192 is used as a load of the power supply device, and is used to amplify an input signal of the radio frequency power amplifier and output an output signal of the radio frequency power amplifier; The radio frequency antenna 153 is used for sending the output signal of the radio frequency power amplifier.

Wherein, any specific structure of the power supply device 191 can be referred to above in detail, and will not be repeated here.

The method of this embodiment uses N current sources, so that the current flowing through a single switch tube is very small, and the small current device is easy to obtain high speed; because the switch device is directly grounded, that is, the switch device is not floating, so the switch device is easy to control; The signal output by the linear amplifying unit can also be fed back to the input terminal of the linear amplifying unit to improve the accuracy of the power supply. It can be seen that the embodiment of the present invention can realize high-speed voltage regulation, and the efficiency of the power amplifier can be improved when it is applied to the radio frequency ET or EER power amplifier and linearity; it can save energy and improve performance.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (12)

1. a supply unit that is used for power amplification is characterized in that, comprising: a linear amplification unit, and the branch road of control appliance and the parallel connection of N bar, N is not less than 2 integer; Wherein, every branch road comprises a current source, first switchgear and a second switch equipment; First switchgear on every branch road respectively with this branch road on current source link to each other with the second open pipe equipment on this branch road;

N current source is used for exporting respectively N road electric current;

Said control appliance is used for the given signal of received current, and according to the closed of the given signal controlling N of said electric current first switchgear or break off;

Said first switchgear is used for breaking off or closure according to the control of control appliance; When first switchgear broke off, the current source on the corresponding branch road outputed current to second switch equipment; When first switchgear was closed, the current source on the corresponding branch road was short-circuit ground;

Said second switch equipment is used for electric current is carried out one-way transmission, with the current delivery of current source output to load, prevent electric current from load flow to first switchgear;

Said linear amplification unit; Link to each other with the output of second switch equipment; Be used for the voltage signal to be amplified that receives is amplified, make voltage signal and said voltage signal to be amplified after the amplification linear, and the voltage signal after voltage to the said amplification of adjustment load;

Wherein, given signal of said electric current and said voltage signal to be amplified are linear relationship or time delay relation.

2. device according to claim 1 is characterized in that, also comprises:

Signal conversion unit is used for the said voltage signal to be amplified that receives is changed, and as the given signal of electric current, and the given signal of said electric current is exported the voltage signal after the conversion to said control appliance.

3. device according to claim 1 is characterized in that, also comprises:

Current detecting unit links to each other with load, is used to detect the electric current of load, and with detected current signal as the given signal of electric current, export control appliance to.

4. device according to claim 1 is characterized in that, also comprises:

Feedback unit be used to receive the signal that said linear amplification unit output is exported, and the signal that will export exports control appliance to as the given signal of electric current.

5. device according to claim 1 is characterized in that, also comprises:

Compensating unit is used to receive the voltage signal to be amplified and the load voltage that are input to said linear amplification unit, and compensates according to the error of said voltage signal to be amplified and said load voltage, and the electric current after will compensating exports load to.

6. device according to claim 5 is characterized in that, said compensating unit comprises: compensating current element, the 3rd switchgear, the 4th switchgear, error amplifying unit, wherein,

Said compensating current element is used for output current;

Said error amplifying unit is used to receive the voltage signal to be amplified and the load voltage that are input to said linear amplification unit, and the error of amplifying said voltage signal to be amplified and load voltage, according to the closed or disconnection of said ERROR CONTROL the 3rd switchgear;

Said the 3rd switchgear is used for breaking off or closure according to the control of error amplifying unit; When the 3rd switchgear breaks off, compensating current element is outputed current to the 4th switchgear; When the 3rd switchgear was closed, compensating current element was short-circuit ground;

Said the 4th switchgear is used for electric current is carried out one-way transmission, with the current delivery of compensating current element output to load, and prevent electric current from load flow to the 3rd switchgear.

7. according to each described device of claim 1 to 6, it is characterized in that, also comprise:

The capacitor filtering unit is used for the electric current of said second switch equipment output is carried out filtering, obtains a level and smooth electric current, and exports this level and smooth electric current to load.

8. device according to claim 6 is characterized in that, also comprises:

The capacitor filtering unit is used for the electric current of said the 4th switchgear output is carried out filtering, obtains a level and smooth electric current, and exports this level and smooth electric current to load.

9. a base station radio frequency system comprises each described supply unit of claim 1 to 8, RF power amplification and radio-frequency antenna;

Said supply unit is used to said RF power amplification power supply;

Said RF power amplification is used for the input signal of RF power amplification is amplified as the load of said supply unit, and output RF power amplification output signal;

Said radio-frequency antenna is used to send said RF power amplification output signal.

10. a method of supplying power to that is used for power amplification is characterized in that, based on each described supply unit of claim 1 to 8, comprising:

Control appliance makes the current source output and the given signal current corresponding of said electric current of N bar branch road according to the closed or disconnection of the given signal controlling N of electric current that receives first switchgear, and N is not less than 2 integer;

When said first switchgear broke off, the current source on the corresponding branch road outputed current to second switch equipment; When said first switchgear was closed, the current source on the corresponding branch road was short-circuit ground; Wherein, said second switch equipment is used for electric current is carried out one-way transmission, with the current delivery of current source output to load, prevent electric current from load flow to first switchgear;

Linear amplification unit amplifies the voltage signal to be amplified that receives, and makes voltage signal and said voltage signal to be amplified after the amplification linear, and the voltage signal after voltage to the said amplification of adjustment load;

Wherein, given signal of said electric current and said voltage signal to be amplified are linear relationship or time delay relation.

11. method according to claim 10 is characterized in that, the obtain manner of the given signal of said electric current comprises:

Change receiving said voltage signal to be amplified, with the conversion after voltage signal as the given signal of electric current; Or

Detect the electric current of load, and with detected current signal as the given signal of electric current; Or

With the feedback signal of said linear amplification unit output as the given signal of electric current; Or

Voltage signal to be amplified is handled, and the voltage signal of generation and voltage signal to be amplified time-delay relation or functional relation is as the given signal of electric current.

12. according to each described method of claim 10 to 11, it is characterized in that, also comprise:

Electric current to the output of second switch equipment carries out filtering, obtains a level and smooth electric current, and exports said level and smooth electric current to load.

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