TWI271022B - Reliable bi-directional driving circuit for wide supply voltage and output range - Google Patents

Abstract

The present invention provides a bi-directional driving circuit for wide supply voltage and output range, which includes a power supply voltage, a bridge circuit containing a first switch, a second switch, a third switch and a fourth switch, in which the power supply voltage provides the power supply, the first, second, third and fourth switches are electrically connected to form two vertical arms respectively each having a first output terminal and a second output terminal, and the first output terminal and the second output terminal are electrically connected with a load; a first power controller containing an output terminal electrically connected with an input terminal of the first switch; a second power controller containing an output terminal electrically connected with an input terminal of the second switch; a third power controller containing an output terminal electrically connected with an input terminal of the third switch; a fourth power controller containing an output terminal electrically connected with an input terminal of the fourth switch; a first loopback network electrically connected with a differential amplifier and a second differential amplifier; a second loopback network containing a control voltage electrically connected therewith and electrically connected with the first differential amplifier, the second differential amplifier and the first output terminal of the bridge circuit; a third loopback network electrically connected with a third differential amplifier, a fourth differential amplifier, and the first output terminal and second output terminal of the bridge circuit; and a fourth loopback network electrically connected with the third differential amplifier and the fourth differential amplifier. A current that flows through the load is substantially independent of the power supply voltage and is proportional to the control voltage.

Description

1271022 IX. Description of the Invention: [Technical Field] The present invention relates to a single power bridge circuit driving circuit. Bidirectional control load current drive circuit, H-bddge bidirectional control load power ^ [Prior Art] For a load component with bidirectional current control, such as Thermal Electric Cooler, etc. For physical characteristics, such as DC motor = square (2) negative, motor rotation direction is clockwise, another example is thermoelectric element, if the current direction is ==. The negative terminal represents the hot junction, the negative terminal represents the cold junction, and the cold and hot junctions are interchanged in each reverse direction. Therefore, a circuit capable of bidirectionally controlling the load power w must be used to fully utilize the application of such a load component. For the manipulation of such components and to have a bidirectional current operation ^, according to the conventional method can be divided into two types: First, the dual power supply mode as shown in Figure 1, a positive power supply Vcc connected to an NPN type power The collector of the transistor 101 (C〇llect〇r), a negative power supply Vee is connected to the collector of a PNP type power transistor 1〇2. A load element is connected to the NPN-type power transistor and the emitter of the pNp-type power transistor 1 and the other end of the load element 1〇3 is grounded. A controller 104 pushes the npn-type power transistor 1〇1 and the PNP-type power transistor 102 according to the input thereof, and transmits the NpN type=power transistor 101 and the PNP-type power transistor 1〇2. The required power is supplied to the load element 103. The current flow of the load component 103 is dependent on the input of the controller 104, can be supplied by the positive power supply vcc, flows into the load component 103, or is supplied by the negative power supply vEE and flows out of the 1271102 load component 103. The disadvantages are: • 2 Group independent voltage source (positive power supply Vcc, negative power supply

Vee) to provide a change in the polarity of the current required for the load element 103. 2, the power utilization is low, the voltage of the terminal of the load component 103 is the maximum swing VRL, Max = Shi (Vi - V be), there is currently a power transistor v be about 0.7V voltage drop, which is not conducive to low voltage operation. Second, single power bridge type (H_bridge) type # = 4, power transistor and load composition, its geometric structure is just like the text "H", so it is called bridge (H-bridge); The polarity connection method can be divided into a gold oxide half field effect transistor (MOSFET), and L is as shown in Fig. 2; or a bipolar transistor (bJT), as shown in Fig. 3. In the structure of Fig. 2 or Fig. 3, the load elements 2〇5, 3〇5 are connected to the source of the four gold oxide half field effect transistors (m〇sfet) or the bipolar transistor (BJT). The emitter has the disadvantage of low power utilization, the maximum voltage of the terminal voltage of the load 205, 305, VRL Max (Vl - 2 Vgs) or VRL, MaX = ± (Vi - 2 Vbe), of which VGS, Vbe For power transistor voltage drop. The bridge (H-bridge) circuit can also be changed to a metal oxide half field effect transistor (M0SFET) (or bipolar transistor (6 s)) as shown in Fig. 4, and a 'mouth structure, the load system is connected to 4 gold oxide half field effect transistor (MOSFET) 401, 402, 403, 404 Drain or bipolar transistor (BJT) collector, so that the maximum voltage of the load terminal can reach the ideal vRL. Max = vcc, but the gates or bases of the four transistors 4〇1, 4〇2, 403, 404 must be controlled separately. As far as the prior art is concerned, the control circuit still has the following disadvantages. : 1· Since the DC control potentials of the gate terminals of the four individual transistors 401, 402, 403, and 404 are different, they cannot be as shown in Figure 2

曰曰 1271022 or Figure 3 is connected directly at the gate or base, so the control circuit is more complicated. 2. If the control circuit is not properly designed, it is possible to generate vertical currents Iver 1 and lver2 as shown in Fig. 4, which flow from the power supply terminal Vcc through the MOSFETs 401, 402. The ground terminal, or the power supply terminal Vcc flows through the metal oxide half field effect transistor (MOSFET) 403, 404 to the ground terminal, because the power supply power is directly applied to the metal oxide half field effect transistor (MOSFET) 401, 402 or the gold Oxygen half field effect transistor (MOSFET) 403, 404 destroyed: damage to the transistor. 3. If the control circuit is not properly designed, even under the condition of driving load, it may be asymmetrically distributed to the diagonal transistor of the bridge (H-bridge) due to power dissipation: the MOS half-effect transistor (MOSFET) 401, 404 or the MOS half-effect transistor (MOSFET) 402, 403 causes power dissipation to concentrate on a certain transistor to destroy the power transistor, which in turn destroys the entire circuit. SUMMARY OF THE INVENTION The dynamic Thunder 乂n-R inter-turn path load power is proportional to the control voltage. ~ Power supply house has nothing to do with the other purpose of the present invention, the 电路 电路 雷 & & & & & & & & & & & & & & & & & & & & & & & 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对 对Phase loss can be evenly distributed across the diagonal

1271022 Another object of the present invention is to provide a dynamic circuit that allows the bidirectional control of the load and has the characteristics of a low drift voltage. A bidirectional control load current drive current drive circuit structure is symmetrical. Another object of the present invention is to provide a dynamic circuit that allows the bidirectional control load to operate electrically. Bidirectional control load current drive drive circuit can be low voltage ^ You ~ secret system provides a bidirectional control load current drive a - i load current drive circuit is a series of single electricity, the original structure and the line at the w / w / Gan two, w brazing & A recognizing το slightly,,, and 〇 structure only need a dozen crystals to form, easy to 1C. Therefore, in order to complete the upper load current driving circuit, a power supply voltage; the object, the present invention provides a bidirectional control comprising: a bridge type third switch, and the fourth switch is respectively a fourth switch, which is controlled by a switch The second power-on connection is electrically connected to form a second output end and a second output second output end; the differential amplifier includes a first switch, a second switch, and a first input and a first input. And electrically connecting the first second input end and electrically connecting the first power supply voltage to provide power supply off and the third switch and the first straight arm, and the two vertical arms respectively have ends, the first output end and the first An input end, an output end of a second differential amplifier, an input end of the first switch, the differential amplifier of the first input switch includes an output end, and the output end of the second differential amplifier is one of the switches a first input second second differential amplifier, comprising a first input terminal, a second input terminal and an output terminal, wherein the third differential amplifier is electrically connected to the third switch - a wheeled terminal; a system 4 1271022 ^ a fourth differential amplifier comprising a first input terminal, a second input terminal and an output terminal, the output terminal of the fourth differential amplifier is electrically connected to the fourth One input end of the switch; a first feedback network electrically connecting the first input end of the first differential amplifier and the first input end of the second differential amplifier; a first feedback network The second feedback network is electrically connected to the second feedback network and the second feedback network is electrically connected to the second input of the first differential amplifier and the second input of the second differential amplifier End 'and electrically connecting the first output of the bridge circuit; # a third feedback network electrically connecting the first input of the third differential amplifier and the first of the fourth differential amplifier An input terminal electrically connected to the first output end of the bridge circuit and the second output end; and a fourth feedback network electrically connected to the second input end of the third differential amplifier and the first a second input of the four differential amplifier; wherein One of the load current of the power supply voltage regardless of the substance is proportional to the control voltage. The above described objects, features, and advantages of the present invention will become more apparent from the following detailed description, drawings and claims. [Embodiment 1 - Please refer to Fig. 5 is a schematic diagram of a bidirectional control load current drive circuit of a preferred embodiment of the present invention. As shown in Fig. 5, the drive circuit is constructed by a main circuit structure 500 and an auxiliary circuit structure 610 and 620. The main circuit structure 500 is composed of a bridge circuit (H-bridge) 510, four sets of gain units 520, 530, 540, 550, four sets of feedback networks 560, 5 70, 5 80 and 590 and a control voltage vc. Composed of. A load 511 straddles the bridge circuit (H_bridge) 5 1 两 2 9 9 1271022 The gain units 520, 530, 540, 550 enter the steady state in advance, forcing the bridge circuit (H-bHdge) to flow through 5 10 0 of each power transistor 5 12, 5 1 3 ' 5 14 , 5 1 5 initial current is zero, after the delay time has passed 'the entire feedback control system can make the structure of Figure 5 achieve the following effect : 1 · No vertical split current flows through the two vertical arms of the bridge circuit (H_bridge); 2. The current flowing through the load is |/J= and the power supply voltage vcc

Irrelevant, only proportional to the control voltage Vc; 3. The voltage is evenly distributed to the bridge circuit (H_bridge) 51〇 diagonal transistor 5 12 and 5 1 5 or 5 13 and 5 14 that is, the power loss can be evenly distributed On the diagonal. 4. Symmetrical Gain Block structure can easily push the output stage to the full voltage range (rail_t〇_rail), that is, from 〇 to Vcc 〇 structure symmetrical and with low drift voltage characteristics 6_ low voltage The operation is as simple as 3v 7. The circuit structure is simple and requires only a dozen transistors to complete, and it is easy to 1C. 8 · Single power supply structure. Please refer to Fig. 6 for the main circuit structure of Figure 5, which is simplified, not circuitized, and 5 is shown. In Figure 5, the feedback network includes two resistors 561, 562 having a resistance of 2R. Therefore, half of the power supply voltage 1/2 Vcc is fed into the positive end of the synthesis node 031 of the first person, and the feedback power of the feedback network 5757, η of FIG. 〕,, its resistance value is 3R separately - gossip._ 枷 & + r knife ~ take out one-half of the power supply voltage Vcc / 3, control voltage Vc / 3 and negative φ ^ A, „ C ” The 鸲 voltage VRL1/3 is added to the synthetic point 632 in one of the six figures. The 赞人赞<门》A 口取和力冬傻 into the sixth figure of the composite node 63ι negative ^. And in Figure 5, the feedback of the sipping ‘road 590 resistance 591, 592 its electric π 1271022

Resistance, 2R is taken out - half of the power supply voltage 1/2 Vcc is fed to the positive end of node 634 of Figure 6 and the resistance of the feedback network 581, 582 of Figure 5 is the resistance of the 2R. The voltages yRLi/2 and vRL2/2 at both ends are added to the node 633 of Fig. 6 and fed to the negative terminal of the node 634 of Fig. 6. The overall effect can be further represented by the simplified diagram of FIG. 7 where 641 is composed of the gain unit 520 of FIG. 5, the gaining unit 53A, the transistor 512 and the transistor 513, and the 642 is composed of The gain unit 54A, the gain unit 550, the transistor 514, and the transistor 515 are shown in FIG. Figure 7 clearly shows that the main circuit structure of Figure 5 is a single-source bridge amplifier. The closed-loop load current can be analyzed by the following. According to this structure, the equation of the closed loop can be obtained as follows:

(1) (2) From (1), (2), the terminal voltages of the available loads are respectively

Vm=VccX-Vc

VRL2=VCCX + VC JRL =

The current flowing through RL is (5) It can be seen from equation (5) that the load current of the closed loop is independent of the power supply voltage Vcc' only proportional to the control voltage Vc. It can be seen from (3) and (4) that the voltage across the load is symmetrical to half of the power supply voltage VCC, thus ensuring the diagonal of the bridge circuit (H-bridge) to the transistors 512 and 515 or 513.

514 not only flows through the same current, but also has the same voltage drop, and does not occur when the force dissipation is concentrated in a certain transistor.曰X and then the bridge circuit (H_bridge) each of the MOS half-field power 12 1271022 crystal (MOSFET) 512, 513, 514 and 515 operating conditions are detailed as follows: characteristics of gold oxide half field effect transistor (M〇SFET) The equation is expressed by

ISD = K (VGS.VT) 八2, VGS > VT ho = 〇5 vGS < VT Vr = 0.6V where Isd is the current through the MOS field-effect transistor (mosfET) 'VGS is the MOS half-field The gate-to-source voltage difference ' ντ of the effect transistor (M〇SFET) is the starting voltage of the metal-oxide half field effect transistor (MOSFET). The output of the gain unit 520, 530, 540, 550 as a controller can reasonably be assumed to be comparable to the power supply or 〇V difference at an output bipolar transistor (BJT) saturation voltage, about 0.2V, when the control voltage Vc< When 〇, the working state of the bridge circuit (H_bridge) is as shown in Fig. 8, and the output bipolar transistors (BJT) of 530 and 540 are in saturation state 'so the heart is about 〇·2ν, which is much smaller than VT, so it is turned off. 5 13 and 514, and 520, 5 50 and 512, 515 are in the working area, ie t > ντ 'the load current of the closed loop is Irl=2Vc/rl, where the load current polarity is defined as 5 14 , 5 1 5 The contact is positive, the 5 12, 5 13 contact is negative, the load current flows from the positive contact to the attachment point is positive, and vice versa. When the control voltage Vc > 0, the working state of the bridge circuit (H-bridge) is as shown in Fig. 9, the working principle is the same as that of the eighth figure, but the closing is 512, 515, and 53 0, 540 and 513, 514 In the working area, the load current of the closed loop is irl==2Vc/Rl. When the control voltage V c = 0, as shown in Fig. 10, the increase is 13 1271022 = unit 520: 530, 540, 550 The output bipolar transistor (BJT) is white in saturation, and the four gold oxide half field effect transistors (M〇SFET) L are about 0.2V, that is, L < ντ, so that the gold oxide half field effect transistor 512 , 513, 514, 515 are closed, at this time the load current Irl = 〇. The power loss of the MOS half-field effect transistor (MqsfeT) is analyzed. When the voltage vc < 0 is controlled, the MOS field 513 and the MOS field 514 are turned off without loss of power. The potential of the drain source flowing through the MOSFETs 5 12 and 5 13 == 512

Vdsi=Vcc-Vrl1=Vcc-(Vcc/2-Vc) = Vcc/2 + Vc (6), the gate-source voltage difference of the gold-oxygen half-field effect transistor 5 1 5

Vds4 = Vrl2 = VCc/2 + Vc = VDS1 (7), so the power loss of the MOS field 512 and the MOSFET 5 5 is p5i2 = p5i5 = l5i2VDsl = I515vDS4 = iRL (vcc / 2+vc) (8). When the control voltage Vc> 〇, the MOS field effect transistor 512 and the MOS field effect transistor 5 15 are turned off without loss of power, and the same can be proved that the MOS field device 5 13 and the gold oxide The power loss of the half field effect transistor 5 14 is P5i3 = P514 = I513VDS2 = I514VDS3 = IRL(Vcc/2 - Ve) (9). The power loss of such a bridge circuit (H-bridge) is evenly distributed over the turned-on diagonal two MOS field-effect (MOS) transistors, and the transistor is not easily damaged by the concentration of power loss. Figure 5 is a main circuit structure of the present invention. One of the specific embodiments of the 'bridge circuit (H_bridge) is composed of a metal oxide half field effect (MOS) transistor, and the gain unit 520 is used as four controllers. 530, 540, 550 consist of a bipolar transistor (BjT). The invention may also be changed to consist of a bipolar transistor (BJT), as shown in Fig. 11 14 1271022 I ° or a bridge circuit (H-bridge) by a bipolar transistor (BJT), four controllers by gold Oxygen half-field effect (M〇s) transistor composition, the figure does not. Or the gold oxide half field effect (MOS) transistor group, as shown in Fig. 13, so that it can be applied to various ic processes. In the application aspect of the invention, a sensor is generally used to check the load output of the circuit (H-bridge), and then the signal of the sensor is converted into a voltage by a turn or a circuit, and the control set voltage is compared with the control voltage. Generating a feedback voltage through a feedback circuit, that is, the present invention

The $input voltage Vc' adjusts the load current so that the final sensor value reaches the set target.

The temperature control of the thermoelectric element for white use is given as a specific application example. As shown in Fig. 14 and Fig. 15, the load of the bridge circuit-bndge in this example is a thermoelectric element (τ}^.ι(10)a ooler ) 'The characteristic is to use the current direction to increase or decrease the target's μ degree, that is, the forward current temperature drop, the reverse current temperature rise, the current resistance ^, then affect the temperature rise or cool down; the sensor is the thermistor (Thermistor) ), its characteristic is that the resistance value changes with temperature. The first μ, the constant current source is used to convert the resistance value of the thermistor (corresponding to the temperature) to “=5 tiger voltage, and then the digital/analog ratio (D/A) converter output voltage balance reaches the control setting. The fifteenth figure uses the bridge resistor wood: the resistance value of the sense resistors, and the resistance value is converted into the signal voltage, and then the control setting is compared with the fixed voltage, and the temperature and the value are set in the 14th and 15th graphs. If there is a value of U, then the integral circuit is adjusted to adjust the VC' into a complete control loop. The case was modified by the people who know the technology, and they are all decorated as if they were protected by the scope of the patent application. [Simple description of the diagram] The first item is a schematic diagram of a bidirectional circuit that can be used for dual power supply. Executive 15 1271022: φ diagram is a conventional gold-oxygen half-field effect transistor (M〇SFET) configuration Early second = bridge (H_bridge) can control the load current circuit bidirectionally. ^ 3 is a circuit diagram of a bipolar transistor (BJT) single-supply bridge ridge that can control the load current bidirectionally. The figure is a circuit diagram of a conventional single-supply bridge (H_bridge) structure for controlling the load current of a gold-oxygen half-field effect transistor (MOSFET) ^ bipolar transistor (B JT ) structure. The figure of Fig. 5 is a schematic diagram of a bidirectional control load electric drive circuit of the first preferred embodiment of the present invention. ^ 6 is a simplified circuit diagram of the main circuit structure of Figure 5. Back to Figure 7 is another simplified circuit diagram of the main circuit structure of Figure 5. Figure 8 is the bridge circuit (H-bridge) of the main circuit of Figure 5 when the control voltage Vc < Schematic diagram of working status. Figure 9 is a schematic diagram showing the working state of the bridge circuit (H_bridge) of the main circuit of Figure 5 when the control voltage Vc > The first! The diagram is the schematic diagram of the working state of the bridge circuit (H-bridge) of the main circuit of Figure 5 when the control voltage VC = 0. Figure 11 is a schematic diagram of a bidirectional control flow drive circuit of a second preferred embodiment of the present invention.第战 Figure 12 is a schematic diagram of a bidirectional current-controlled drive circuit of the third preferred embodiment of the present invention.贞Dai Di 13 is a schematic diagram of a bidirectional control load current drive circuit according to a fourth preferred embodiment of the present invention. Figure 14 is a schematic diagram of a bidirectional control load current drive circuit for a specific application example of thermoelectric element temperature control in this case. The $1 5 diagram is a schematic diagram of the bidirectional control load current drive circuit of another thermoelectric element temperature control specific application embodiment of the present invention. 16 1271022 [Main component symbol description] - 500 main circuit structure 5 10 bridge circuit (H-bridge) 511 load 512, 513, 514, 515 transistor 520, 530, 540, 550 gain unit 521, 522, 523, 524 Transistor 525 Current Source 531, 532, 533, 534 Transistor φ 5 3 5 Current Source 541, 542, 543, 544 Transistor 5 4 5 Current Source 551, 552, 553, 554 Transistor 5 5 5 Current Source* 5 60, 5 70 ' 5 80, 5 90 feedback network. 561, 562 resistors 571, 572, 573 resistors 581, 582 resistors 591, 592 resistors # 6 1 0 power delay switch 620 current detection and overcurrent protection circuit 17

Claims (1)

1271022 - a third feedback network electrically connecting the first input end of the third differential amplifier and the first input end of the fourth differential amplifier, and electrically connecting the -5 bridge circuit An output terminal and the second output terminal; and a fourth feedback network electrically connecting the second input end of the third differential amplifier and the second input end of the fourth differential amplifier; The current flowing through one of the loads is substantially independent of the supply voltage and is proportional to the control voltage. 2. The bidirectional control load current drive circuit as described in item 1 of the application scope further includes: • a current detection and overcurrent protection circuit electrically connecting the bridge circuit to feedback a voltage signal such that when the load current exceeds a set value provides a control signal; and "a power delay switch electrically connected to the current sense and overcurrent protection circuit" when the power delay switch receives the control signal, turning off the power supply voltage to the bidirectional control load current drive 3. The power supply of the circuit 3. The bidirectional control load current drive circuit as described in the scope of claim 1 wherein the bridge circuit is composed of a metal oxide half field effect (MOS) transistor. 4 · As described in item 1 of the application scope The bidirectional control load current drive circuit #路' wherein the first differential amplifier, the second differential amplifier, the third differential amplifier, and the fourth differential amplifier are composed of a bipolar transistor (BjT). The bidirectional control load current drive circuit of claim 3, wherein the first differential amplifier, the second differential amplifier, the first The three differential amplifier and the fourth differential amplifier are composed of a bipolar transistor (Bjt). 6. The bidirectional control load current driving circuit of claim 1, wherein the first differential amplifier, The second differential amplifier, the third differential amplifier, and the fourth differential amplifier are composed of a gold oxide half field effect (M〇s) transistor. 19 127ϊ022 7 · Bidirectional control as described in claim 3 a load current driving circuit, wherein the first differential amplifier, the second differential amplifier, the third differential amplifier, and the fourth differential amplifier are composed of a gold oxide half field effect (M〇s) transistor. The bidirectional control load current driving circuit according to the first aspect of the application, wherein the bridge circuit is composed of a bipolar transistor (BJT). 9. The bidirectional control load current driving circuit as described in claim 8 The e-di differential amplifier, the second differential amplifier, the third differential amplifier, and the fourth differential amplifier are composed of a bipolar transistor (Bjt). Double Controlling a load current driving circuit 'where the first differential amplifier, the second differential amplifier, the third differential amplifier, and the fourth differential amplifier are composed of a gold oxide half field effect (M〇s) transistor. The bidirectional control load current drive circuit of claim 1, wherein the first feedback network returns a half of a voltage supplied by the power supply voltage, and is input to the first of the first differential amplifiers. The input terminal and the first input end of the second differential amplifier. 12. The bidirectional control load current driving circuit as described in the scope of the application, wherein the second feedback network is provided by the power supply voltage a third of the voltage, a third of the control voltage, and a third of the voltage provided by the first output of the bridge circuit, input to the second input of the first differential amplifier And the second input terminal of the second differential amplifier, and the bidirectional control load current driving circuit of the invention, wherein the second feedback network returns the voltage provided by the power supply voltage One of the three values of f, one third of the value of the control voltage and one third of the voltage provided by the first wheel of the bridge circuit, inputting the first differential 20 1271022 output::: ! The rate controller 'includes a _, the power controller is electrically connected to one of the input ends of the first switch; a second power controller includes an output terminal, and the end is electrically connected to the first The input terminal of one of the two switches; the third power controller of the Guardian J, includes an output end, and the output end of the third power clamp is electrically connected to one of the input ends of the third switch; The power controller includes an output ^, and the output of the fourth power is electrically connected to one of the input ends of the fourth switch; the first feedback network is electrically connected to the first power controller and a power control The brother feedback network, including a control voltage brother 4A m ^ worker% bite funeral second back ^ 篦 L i the second feedback network connection (four) _ power rate controller and = brother a power The controller, and the first output and the third feedback network electrically connected to the bridge circuit, electrically connect the third power controller to the m controller, and electrically connect the first output end of the bridge circuit: And the second output of the second; and a fourth feedback network, electrically connecting the third power The controller is configured to cause a current flowing through the load to be independent of, and proportional to, the control voltage. 19 is as claimed in claim 18, wherein the first feedback network drives the first feedback power network, and returns a half value of the voltage provided by the power supply voltage, and inputs the first power controller and The second power controller. 20 Ganru application - the two-way control load current driving electric power according to item 18 of the scope, the second feedback network is one of the voltages supplied by the power supply voltage, and the control voltage is three points. One value and one-third of the voltage provided by the output of the second of the bridge circuit are input to the first power controller and the second power controller. 22 ί271〇22 power controller, comprising an output terminal, the third power control first wheel output terminal is electrically connected to one of the third switch input terminals, and a fourth power controller includes an output end, the fourth The power control °, the output is electrically connected to one of the input ends of the fourth switch; and the eight complex feedback networks, including a control voltage, the plurality of feedback networks #= not electrically connected to the first power controller The second power controller, the =two power controller, and the fourth power controller are such that a current flowing through the negative g is proportional to the control voltage. Road 2, 7 · The bidirectional control load current drive power as described in item 5% of the application range, wherein the plurality of feedback networks return the voltage half value provided by the power supply voltage, and input the first power controller and The second power controller. The circuit 2, 8 · is set as described in the scope of the application of the two-way control load current drive power one or two of the plurality of feedback networks are feedback of the voltage provided by the power supply voltage, the control voltage A one-third value and a three-point value of the voltage provided at the output of the bridge circuit, a negative feedback input to the J rate controller and the second power controller. Road 2, 9·1, as described in item 27 of the t range, the bidirectional control load current drives the electric two-two "Hai number of feedback networks to feedback the voltage provided by the power supply voltage; ^^^ value, the control One-third of the voltage and the bridge circuit: = : = one-third of the voltage supplied, the negative feedback input to the rate controller and the second power controller. Road 3, 0 should be like V: dry circumference, as described in item 26 of the two-way control load current drive, the number of feedback networks is fed back to the bridge circuit, the first to lose the third work: iri out The half value of the output voltage of the terminal, the negative feedback input device and the fourth power controller. Lu Qiruzhong=Wei 2: The two-way control load current drive electric output fixed feedback network is to return the output of the first input and the end of the bridge circuit - half value, negative Return to the Zhenggong and the fourth power controller. twenty four